WO2010076980A2 - Magnetic field profile measuring apparatus for electromagnet of closed-type cyclotron - Google Patents

Magnetic field profile measuring apparatus for electromagnet of closed-type cyclotron Download PDF

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Publication number
WO2010076980A2
WO2010076980A2 PCT/KR2009/007254 KR2009007254W WO2010076980A2 WO 2010076980 A2 WO2010076980 A2 WO 2010076980A2 KR 2009007254 W KR2009007254 W KR 2009007254W WO 2010076980 A2 WO2010076980 A2 WO 2010076980A2
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WIPO (PCT)
Prior art keywords
unit
rotation unit
magnetic field
rotation
iron yoke
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PCT/KR2009/007254
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French (fr)
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WO2010076980A3 (en
Inventor
You Seok Kim
Seong Seok Hong
Joon Sun Kang
Ki Hyeon Park
Young Gyu Jung
Young Duck Yun
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Korea Institute Of Radiological & Medical Sciences
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Publication of WO2010076980A2 publication Critical patent/WO2010076980A2/en
Publication of WO2010076980A3 publication Critical patent/WO2010076980A3/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/07—Hall effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/10—Plotting field distribution ; Measuring field distribution

Definitions

  • the present invention relates to an apparatus for precisely measuring the whole magnetic field profile of a space in an electromagnet installed in a closed-type cyclotron formed of a cylindrical iron yoke, in real time.
  • the present invention is derived from a research project supported by the Nuclear Power Research & Development (R&D) program of the Ministry of Education, Science and Technology [M2070605000108M060500110, Development of Key Techniques of Superconductor Cyclotron Accelerator].
  • R&D Nuclear Power Research & Development
  • magnetic field profile measurements are performed using a loop coil and an integrator, or using a Hall probe, namely, a "Hall sensor"
  • the magnetic field profile of a device inserted into an accelerator may be measured on the spot by using a pulse wire.
  • a system that is a combination of a Hall probe and a Tesla meter have frequently been used in order to perform magnetic field profile measurements.
  • a meter that can measure the profile of a magnetic field with a precision of 0.001 % when the size of a measurement system is small and the Hall sensor is used has been in common use.
  • the precision of magnetic field profile measurements has been increased owing to the development of mechatronics for precisely performing location control.
  • the manufacturing costs of magnetic field profile measuring apparatuses are high.
  • the Hall sensor that senses the intensity of a magnetic field is used in order to measure the whole magnetic field profile of an electromagnet.
  • a cyclotron electromagnet is a combination of a cylindrical iron yoke and a coil.
  • a cantilever-type moving unit is disposed above the iron yoke to move along a direction of the diameter of the iron yoke, where the moving unit includes a Hall sensor.
  • the Hall sensor moves to sense a signal corresponding to the intensity of a magnetic field on a location in the direction of the diameter of the iron yoke.
  • the moving unit moves along guide rails between which the iron yoke is disposed.
  • a motor is disposed at one end of the moving unit that is a cantilever-type device, and controls the movement of the moving unit to along the guide rails.
  • a Hall sensor enters into a space of an iron yoke having an electromagnet in order to measure the intensity of a magnetic field.
  • the magnetic field profile measuring apparatus cannot be used to measure the magnetic field profile of an electromagnet of a closed-type cyclotron in which an iron yoke is a closed-type device. That is, since a space in the iron yoke is isolated from the outside, a Hall sensor of the magnetic field profile measuring apparatus cannot enter the space in the electromagnet.
  • a Hall probe used to measure the intensity of a magnetic field is sensitive to ambient conditions, such as temperature and humidity, and thus, the intensity of a magnetic field should be measured as quickly as possible.
  • the present invention provides a magnetic field profile measuring apparatus for measuring the magnetic field profile of a cylindrical electromagnet of a closed-type cyclotron.
  • an apparatus for measuring a magnetic field profile of a closed-type cyclotron having a cylindrical electromagnet including a rotation unit disposed in a space in a plane at a center of an iron yoke, passing through the center of the iron yoke, and extending along a direction of a diameter of the iron yoke, the rotation unit being installed such that the rotation unit rotates with respect to the iron yoke; a sensor transportation unit combined with the rotation unit such that the sensor transportation unit moves forward or backward on the rotation unit along a direction of a length of the rotation unit, the sensor transportation unit being attached with a sensor for measuring intensity of a magnetic field; a first driving device for rotating the rotation unit; and a second driving device for moving the sensor transportation unit forward and backward on the rotation unit.
  • a magnetic field profile measuring apparatus can measure the magnetic field profile of an electromagnet of a closed-type cyclotron covered by an iron yoke.
  • a sensor for measuring the intensity of a magnetic field is installed in a sensor transportation unit that moves linearly on a rotation unit that rotates in the whole space in the iron yoke, thereby measuring the distribution of the magnetic field precisely and rapidly.
  • FIG. 1 illustrates a state in which an apparatus for measuring the magnetic field profile of an electromagnet of a closed-type cyclotron is installed in the closed-type cyclotron, according to an embodiment of the present invention
  • FIG. 2 is a plane view of the apparatus of FIG. 1, according to an embodiment of the present invention.
  • FIG. 3 is an enlarged view of a rotation unit and a sensor transportation unit included in the apparatus of FIG. 1, according to an embodiment of the present invention
  • FIG. 4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3;
  • FIG. 5 illustrates the relationship between a first driving device and a rotation shaft illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention
  • FIG. 6 illustrates the relationship between a wire unit connected with the sensor transportation unit and a second driving device illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention
  • FIG. 7 is a diagram illustrating the principle of movement of the sensor transportation unit of FIG. 1, according to an embodiment of the present invention.
  • FIG. 1 illustrates a state in which an magnetic field profile measuring apparatus 10 for measuring the magnetic field profile of an electromagnet of a closed-type cyclotron (hereinafter referred to as "magnetic field profile measuring apparatus") is installed in the closed-type cyclotron, according to an embodiment of the present invention.
  • FIG. 2 is a plane view of the magnetic field profile measuring apparatus 10 of FIG. 1, according to an embodiment of the present invention.
  • FIG. 3 is an enlarged view of a rotation unit 20 and a sensor transportation unit 30 included in the magnetic field profile measuring apparatus 10 illustrated in FIG. 1, according to an embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3.
  • FIG. 5 illustrates the relationship between a first driving device 50 and a rotation shaft 40 illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention.
  • FIG. 6 illustrates the relationship between a wire 36 connected with the sensor transportation unit 30 and a second driving device 60 illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating the principle of movement of the sensor transportation unit 30 of FIG. 1, according to an embodiment of the present invention.
  • the magnetic field profile measuring apparatus 10 measures the magnetic field profile of the cylindrical electromagnet of the closed-type cyclotron.
  • the closed-type cyclotron includes a cylindrical iron yoke 12, and a coil 13 for generating a magnetic force on the iron yoke 12.
  • a space 15 is formed in a plane on the center of the iron yoke 12.
  • the iron yoke 12 is supported by a plurality of legs 14 to be disposed apart from the ground. Since the space 15 is covered by the iron yoke 12, direct access cannot be made to the space 15.
  • the magnetic field profile measuring apparatus 10 is installed into the space 15 in the iron yoke 12, measures the magnetic field profile in the space 15, and is then separated from the electromagnet of the cyclotron.
  • the magnetic field profile measuring apparatus 10 includes the rotation unit 20, the sensor transportation unit 30, the first driving device 50, and the second driving device 60.
  • the rotation unit 20 is disposed in the space 15.
  • the rotation unit 20 passes through the center of the space 15 and extends along a direction of the diameter of the space 15.
  • the rotation unit 20 is installed to rotate with respect to the iron yoke 12.
  • the rotation unit 20 includes a pair of guide rails 22 for guiding movement of the sensor transportation unit 30, as will be described later.
  • the pair of guide rails 22 is disposed along a direction of the length of the rotation unit 20.
  • Each of the guide rails 22 includes a guide groove 23.
  • the pair of the guide rails 22 is used to guide linear movement of the sensor transportation unit 30.
  • a support unit 24 is disposed at both ends of the rotation unit 20 to prevent the rotation unit 20 from bending.
  • a first wheel 25 is installed in upper and lower parts of each of the support units 24. The first wheels 25 rotates while contacting the iron yoke 12.
  • the rotation unit 20 is installed within the magnetic field and is thus manufactured using acryl resin or plastic that is not influenced by the magnetic field.
  • the sensor transportation unit 30 is combined with the rotation unit 20 such that the sensor transportation unit 30 may move forward or backward on the rotation unit 20 along the direction of the length of the rotation unit 20.
  • the sensor transportation unit 30 is attached with two sensors 32 each for measuring the intensity of a magnetic field.
  • the sensors 32 used are Hall sensors or Hall probes.
  • the sensors 32 are each connected to an external controller (not shown) via a wire.
  • Each of the sensors 32 measures the intensity of a magnetic field generated by the iron yoke 12 and transmits the measurement result to the external controller.
  • the two sensors 32 are disposed on the sensor transportation unit 30 separate from each other.
  • the sensor transportation unit 30 includes a plurality of second wheels 34. Each of the second wheels 34 rotate in contact with its corresponding guide groove 23 of the guide rails 22 of the rotation unit 20.
  • the second wheels 34 are installed such that the sensor transportation unit 30 may move smoothly forward or backward on the rotation unit 20.
  • the sensor transportation unit 30 is also installed within the magnetic field and is thus manufactured using acryl resin or plastic that
  • the first driving device 50 is installed to rotate the rotation unit 20.
  • the first driving device 50 includes the rotation shaft 40, a disk gear 42, a first motor 52, and a belt 54.
  • the rotation shaft 40 is fixed on the center of the rotation unit 20.
  • the disk gear 42 is fixed on the rotation shaft 40.
  • the disk gear 42 has teeth along the circumference thereof.
  • the other end of the rotation shaft 40 is fixed on the second driving device 60 which will be described in detail.
  • the first motor 52 is installed to rotate the disk gear 42.
  • the first motor 52 is fixed on the iron yoke 12.
  • a first encoder is installed to measure and control the amount of rotation of the first motor 52, and the first motor 52 is electrically connected to the external controller to be controlled by the external controller.
  • the belt 54 connects the first motor 52 with the disk gear 42 so that the first motor 52 supplies power to the disk gear 42.
  • the belt 54 also has teeth for engaging with those of the disk gear 42.
  • the belt 54 delivers the power of rotation of the first motor 52 to the disk gear 42. If the disk gear 42 rotates, then the rotation shaft 40 also rotates while being engaged with the disk gear 42. Thus, the rotation unit 20 and the second driving device 60 also rotate since they are fixed on the rotation shaft 40.
  • the second driving device 60 is installed to move the sensor transportation unit 30 linearly on the rotation unit 20.
  • the second driving device 60 includes a rotation frame 62, a second motor 64, a ball screw 66, a linear movement unit 67, and a wire 36.
  • the rotation frame 62 is fixed on the other end of the rotation shaft 40. Thus, the rotation frame 62 rotates while being engaged with the rotation shaft 40.
  • the second motor 64 is fixed on the rotation frame 62.
  • the second motor 64 includes a second encoder (not shown) for measuring the amount of rotation of the second motor 64 and transmitting a signal indicating the amount of rotation to the external controller so that the external controller can precisely control the second motor 64.
  • the ball screw 66 is installed in the rotation frame 62, and connected to the second motor 64 in order to supply power to the linear movement unit 67.
  • the linear movement unit 67 linearly moves along the ball screw 66 when the second motor 64 rotates.
  • the wire 36 connects the sensor transportation unit 30 and the linear movement unit 67 like a loop.
  • the sensor transportation unit 30 and the linear movement unit 67 that are connected to each other via the wire 36 linearly move together.
  • the wire 36 is tensely supported by either the rotation frame 62 or a plurality of rollers 70 included in the rotation unit 20.
  • the sensor transportation unit 30 moves linearly on the rotation unit 20 according to the linear movement of the linear movement unit 67.
  • a method of measuring the magnetic field profile of an electromagnet of a closed-type cyclotron by using the magnetic field profile measuring apparatus 10 of FIG. 1 will now be described in detail.
  • the magnetic field profile measuring apparatus 10 is installed in the closed-type cyclotron.
  • the closed type cyclotron operates to generate a magnetic field in the iron yoke 12, and then, the first motor 52 operates.
  • the belt 54 delivers a driving force to the disk gear 42 in order to rotate the disk gear 42.
  • the rotation shaft 40 also rotates and the rotation unit 20 that is fixed on the rotation shaft 40 moves in the magnetic field in the iron yoke 12.
  • the sensor 32 measures the intensity of the magnetic field and transmits the measurement result to the external controller.
  • the first motor 52 repeatedly and alternately rotates clockwise by 360 and rotates anti-clockwise by 360 .
  • the sensor 32 rotates similar to the first motor 52 to continuously measure the intensity of the magnetic field and to transmit the measurement result to the external controller.
  • a step motor is used as the first motor 52, and the sensor 32 measures the intensity of the magnetic field at intervals of 0.04 , together with the first encoder.
  • the sensor 32 forms a measurement cell of a magnetic field at intervals of 10 mm along a direction of the radius of the electromagnet. While the rotation unit 20 rotates clockwise and anti- clockwise, the second driving device 60 moves the sensor transportation unit 30 linearly along a direction of the length of the rotation unit 20.
  • the rotation unit 20 rotates once by 360 degrees, the sensor transportation unit 30 is moved to a predetermined length along the direction of the length of the rotation unit 20, and then the rotation unit 20 rotates by 360 degrees in the opposite direction to measure the intensity of the magnetic field.
  • the linear movement of the sensor transportation unit 30 according to an embodiment of the present invention will now be described.
  • the second motor 64 is driven.
  • the linear movement unit 67 linearly moves due to the ball screw 66 connected to the second motor 64.
  • the sensor transportation unit 30 connected to the linear movement unit 67 via the wire 36 linearly moves together with the linear movement unit 67. That is, the linear movement unit 67 moves linearly on the rotation frame 62, and the sensor transportation unit 30 connected to the linear movement unit 67 via the wire 36 also moves linearly along the guide rails 22 on the rotation unit 20.
  • the distribution of a magnetic field generated by the electromagnet may be continuously measured.
  • the first motor 52, the second motor 64, and the first and second encoders were used, a measurement cell of a magnetic field was set in the whole space 15 in the iron yoke 12 at intervals of 10 mm along a direction of the radius of the electromagnet and at intervals of 0.04 along the circumference of the electromagnet, and then 9000 data measurements were obtained whenever the rotation unit 20 rotates once. As a result, a total of 729000 data measurements were obtained by measuring the intensity of the magnetic field for one hour and twenty minutes.
  • the magnetic field profile measuring apparatus 10 is capable of precisely and rapidly measuring the intensity of a magnetic field in a space, e.g., an electromagnet of a closed-type cyclotron covered by an iron yoke, in which magnetic field profile measurements are difficult to be performed.
  • one of the support units 24 is disposed at both ends of the rotation unit 20 in order to prevent the rotation unit 20 from bending, and each of the support units 24 includes the first wheels 25 that rotate in contact with the iron yoke 12.
  • the support units 24 may be omitted when the firmness of the rotation unit 20 is guaranteed.
  • the rotation unit 20 includes the guide rails 22 for guiding movement of the sensor transportation unit 30, and the sensor transportation unit 30 includes the second wheels 34 that rotate in contact with the guide rails 22, but the guide rails 22 or the second wheels 34 may be omitted, for example, when the sensor transportation unit 30 can slide smoothly on the rotation unit 20.
  • the first driving device 50 includes the rotation shaft 40, one end of which is fixed on the center of the rotation unit 20; the disk gear 42 that is fixed on the rotation shaft 40 and has teeth along the circumference thereof; the first motor 52 fixed on the iron yoke 12 in order to rotate the disk gear 42; and the belt 54 that connects the first motor 52 with the disk gear 42 so that the first motor 52 can supply power to the disk gear 42.
  • the present invention is not limited thereto.
  • the first motor 52 of the first driving device 50 may be connected to the rotation unit 20 in order to directly drive the rotation unit 20.
  • the first driving device 50 may not include all the elements described above.
  • the second driving device 60 includes the second motor 64, the ball screw 66 that is connected to the second motor 64 in order to supply power to the second motor 64, the linear movement unit 67 that moves linearly along the ball screw 66, and the wire 36 that connects the sensor transportation unit 30 with the linear movement unit 67.
  • the present invention is not limited thereto.
  • the second driving device 60 may move the sensor transportation unit 30 by connecting the second motor 64 directly with the wire 36.
  • a magnetic field profile measuring apparatus can measure the magnetic field profile of an electromagnet of a closed-type cyclotron covered by an iron yoke.
  • a sensor for measuring the intensity of a magnetic field is installed in a sensor transportation unit that moves linearly on a rotation unit that rotates in the whole space in the iron yoke, thereby measuring the distribution of the magnetic field precisely and rapidly.
  • a support unit may be installed at both ends of the rotation unit in order to prevent the rotation unit from bending.
  • Each of the support units may include a first wheel that rotates in contact with the iron yoke.
  • the rotation unit may include a plurality of guide rails for guiding movement of the sensor transportation unit, and the sensor transportation unit may include a plurality of second wheels that rotate in contact with the guide rails.
  • the first driving device may include a rotation shaft, one end of which is fixed at the center of the rotation unit; a disk gear fixed on the rotation shaft, the disk gear including teeth along a circumference thereof; a first motor fixed on the iron yoke in order to rotate the disk gear and a belt for connecting the first motor with the disk gear so that the first motor supplies power to the disk gear.
  • the second driving device may include a second motor; a ball screw connected to the second motor; a linear movement unit moving linearly along the ball screw driven by the second motor; and a wire unit for connecting the sensor transportation unit with the linear movement unit like a loop.
  • the sensor transportation unit may move linearly on the rotation unit according to linear movement of the linear movement unit.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Particle Accelerators (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

An apparatus for measuring the magnetic field profile of an electromagnet of a closed-type cyclotron. The apparatus includes a rotation unit disposed in a space in a plane at a center of an iron yoke, passing through the center of the iron yoke, and extending along a direction of a diameter of the iron yoke, the rotation unit being installed such that the rotation unit rotates with respect to the iron yoke; a sensor transportation unit combined with the rotation unit such that the sensor transportation unit moves forward or backward on the rotation unit along a direction of a length of the rotation unit, the sensor transportation unit being attached with a sensor for measuring intensity of a magnetic field; a first driving device for rotating the rotation unit; and a second driving device for moving the sensor transportation unit forward and backward on the rotation unit.

Description

MAGNETIC FIELD PROFILE MEASURING APPARATUS FOR ELECTROMAGNET OF CLOSED-TYPE CYCLOTRON
This application claims the benefit of Korean Patent Application No. 10-2008-0138734, filed on December 31, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
The present invention relates to an apparatus for precisely measuring the whole magnetic field profile of a space in an electromagnet installed in a closed-type cyclotron formed of a cylindrical iron yoke, in real time.
The present invention is derived from a research project supported by the Nuclear Power Research & Development (R&D) program of the Ministry of Education, Science and Technology [M2070605000108M060500110, Development of Key Techniques of Superconductor Cyclotron Accelerator].
In general, magnetic field profile measurements are performed using a loop coil and an integrator, or using a Hall probe, namely, a "Hall sensor" Also, the magnetic field profile of a device inserted into an accelerator may be measured on the spot by using a pulse wire. However, as the sensitivity of the Hall sensor becomes increased and analog signal processing techniques are developed, a system that is a combination of a Hall probe and a Tesla meter have frequently been used in order to perform magnetic field profile measurements. Recently, a meter that can measure the profile of a magnetic field with a precision of 0.001 % when the size of a measurement system is small and the Hall sensor is used, has been in common use. Also, the precision of magnetic field profile measurements has been increased owing to the development of mechatronics for precisely performing location control. However, the manufacturing costs of magnetic field profile measuring apparatuses are high.
In general, in an apparatus for measuring the profile of a magnetic field of a cyclotron electromagnet (hereinafter referred to as a "magnetic field profile measuring apparatus"), the Hall sensor that senses the intensity of a magnetic field is used in order to measure the whole magnetic field profile of an electromagnet.
A cyclotron electromagnet is a combination of a cylindrical iron yoke and a coil. A cantilever-type moving unit is disposed above the iron yoke to move along a direction of the diameter of the iron yoke, where the moving unit includes a Hall sensor. The Hall sensor moves to sense a signal corresponding to the intensity of a magnetic field on a location in the direction of the diameter of the iron yoke.
Here, the moving unit moves along guide rails between which the iron yoke is disposed. A motor is disposed at one end of the moving unit that is a cantilever-type device, and controls the movement of the moving unit to along the guide rails.
In the magnetic field profile measuring apparatus, a Hall sensor enters into a space of an iron yoke having an electromagnet in order to measure the intensity of a magnetic field. However, the magnetic field profile measuring apparatus cannot be used to measure the magnetic field profile of an electromagnet of a closed-type cyclotron in which an iron yoke is a closed-type device. That is, since a space in the iron yoke is isolated from the outside, a Hall sensor of the magnetic field profile measuring apparatus cannot enter the space in the electromagnet.
Thus, there is a need to develop a new magnetic field profile measuring apparatus capable of measuring the magnetic field profile of an electromagnet of a closed-type cyclotron.
Also, a Hall probe used to measure the intensity of a magnetic field is sensitive to ambient conditions, such as temperature and humidity, and thus, the intensity of a magnetic field should be measured as quickly as possible.
The present invention provides a magnetic field profile measuring apparatus for measuring the magnetic field profile of a cylindrical electromagnet of a closed-type cyclotron.
According to an aspect of the present invention, there is provided an apparatus for measuring a magnetic field profile of a closed-type cyclotron having a cylindrical electromagnet, the apparatus including a rotation unit disposed in a space in a plane at a center of an iron yoke, passing through the center of the iron yoke, and extending along a direction of a diameter of the iron yoke, the rotation unit being installed such that the rotation unit rotates with respect to the iron yoke; a sensor transportation unit combined with the rotation unit such that the sensor transportation unit moves forward or backward on the rotation unit along a direction of a length of the rotation unit, the sensor transportation unit being attached with a sensor for measuring intensity of a magnetic field; a first driving device for rotating the rotation unit; and a second driving device for moving the sensor transportation unit forward and backward on the rotation unit.
According to the above embodiments, a magnetic field profile measuring apparatus can measure the magnetic field profile of an electromagnet of a closed-type cyclotron covered by an iron yoke. A sensor for measuring the intensity of a magnetic field is installed in a sensor transportation unit that moves linearly on a rotation unit that rotates in the whole space in the iron yoke, thereby measuring the distribution of the magnetic field precisely and rapidly.
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
FIG. 1 illustrates a state in which an apparatus for measuring the magnetic field profile of an electromagnet of a closed-type cyclotron is installed in the closed-type cyclotron, according to an embodiment of the present invention;
FIG. 2 is a plane view of the apparatus of FIG. 1, according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a rotation unit and a sensor transportation unit included in the apparatus of FIG. 1, according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3;
FIG. 5 illustrates the relationship between a first driving device and a rotation shaft illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention;
FIG. 6 illustrates the relationship between a wire unit connected with the sensor transportation unit and a second driving device illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention; and
FIG. 7 is a diagram illustrating the principle of movement of the sensor transportation unit of FIG. 1, according to an embodiment of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 illustrates a state in which an magnetic field profile measuring apparatus 10 for measuring the magnetic field profile of an electromagnet of a closed-type cyclotron (hereinafter referred to as "magnetic field profile measuring apparatus") is installed in the closed-type cyclotron, according to an embodiment of the present invention. FIG. 2 is a plane view of the magnetic field profile measuring apparatus 10 of FIG. 1, according to an embodiment of the present invention. FIG. 3 is an enlarged view of a rotation unit 20 and a sensor transportation unit 30 included in the magnetic field profile measuring apparatus 10 illustrated in FIG. 1, according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3. FIG. 5 illustrates the relationship between a first driving device 50 and a rotation shaft 40 illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention. FIG. 6 illustrates the relationship between a wire 36 connected with the sensor transportation unit 30 and a second driving device 60 illustrated in FIG. 1 for delivering power, according to an embodiment of the present invention. FIG. 7 is a diagram illustrating the principle of movement of the sensor transportation unit 30 of FIG. 1, according to an embodiment of the present invention.
Referring to FIGS. 1 to 7, the magnetic field profile measuring apparatus 10 measures the magnetic field profile of the cylindrical electromagnet of the closed-type cyclotron. The closed-type cyclotron includes a cylindrical iron yoke 12, and a coil 13 for generating a magnetic force on the iron yoke 12. A space 15 is formed in a plane on the center of the iron yoke 12. The iron yoke 12 is supported by a plurality of legs 14 to be disposed apart from the ground. Since the space 15 is covered by the iron yoke 12, direct access cannot be made to the space 15.
Thus, the magnetic field profile measuring apparatus 10 is installed into the space 15 in the iron yoke 12, measures the magnetic field profile in the space 15, and is then separated from the electromagnet of the cyclotron.
The magnetic field profile measuring apparatus 10 includes the rotation unit 20, the sensor transportation unit 30, the first driving device 50, and the second driving device 60.
The rotation unit 20 is disposed in the space 15. The rotation unit 20 passes through the center of the space 15 and extends along a direction of the diameter of the space 15. The rotation unit 20 is installed to rotate with respect to the iron yoke 12. The rotation unit 20 includes a pair of guide rails 22 for guiding movement of the sensor transportation unit 30, as will be described later. The pair of guide rails 22 is disposed along a direction of the length of the rotation unit 20. Each of the guide rails 22 includes a guide groove 23. The pair of the guide rails 22 is used to guide linear movement of the sensor transportation unit 30. A support unit 24 is disposed at both ends of the rotation unit 20 to prevent the rotation unit 20 from bending. A first wheel 25 is installed in upper and lower parts of each of the support units 24. The first wheels 25 rotates while contacting the iron yoke 12. The rotation unit 20 is installed within the magnetic field and is thus manufactured using acryl resin or plastic that is not influenced by the magnetic field.
The sensor transportation unit 30 is combined with the rotation unit 20 such that the sensor transportation unit 30 may move forward or backward on the rotation unit 20 along the direction of the length of the rotation unit 20. The sensor transportation unit 30 is attached with two sensors 32 each for measuring the intensity of a magnetic field. In general, the sensors 32 used are Hall sensors or Hall probes. The sensors 32 are each connected to an external controller (not shown) via a wire. Each of the sensors 32 measures the intensity of a magnetic field generated by the iron yoke 12 and transmits the measurement result to the external controller. The two sensors 32 are disposed on the sensor transportation unit 30 separate from each other. The sensor transportation unit 30 includes a plurality of second wheels 34. Each of the second wheels 34 rotate in contact with its corresponding guide groove 23 of the guide rails 22 of the rotation unit 20. The second wheels 34 are installed such that the sensor transportation unit 30 may move smoothly forward or backward on the rotation unit 20. The sensor transportation unit 30 is also installed within the magnetic field and is thus manufactured using acryl resin or plastic that is not influenced by the magnetic field.
The first driving device 50 is installed to rotate the rotation unit 20. The first driving device 50 includes the rotation shaft 40, a disk gear 42, a first motor 52, and a belt 54.
One end of the rotation shaft 40 is fixed on the center of the rotation unit 20. The disk gear 42 is fixed on the rotation shaft 40. The disk gear 42 has teeth along the circumference thereof. The other end of the rotation shaft 40 is fixed on the second driving device 60 which will be described in detail. The first motor 52 is installed to rotate the disk gear 42. The first motor 52 is fixed on the iron yoke 12. Although not shown, a first encoder is installed to measure and control the amount of rotation of the first motor 52, and the first motor 52 is electrically connected to the external controller to be controlled by the external controller. The belt 54 connects the first motor 52 with the disk gear 42 so that the first motor 52 supplies power to the disk gear 42. The belt 54 also has teeth for engaging with those of the disk gear 42. When the first motor 52 operates, the belt 54 delivers the power of rotation of the first motor 52 to the disk gear 42. If the disk gear 42 rotates, then the rotation shaft 40 also rotates while being engaged with the disk gear 42. Thus, the rotation unit 20 and the second driving device 60 also rotate since they are fixed on the rotation shaft 40.
The second driving device 60 is installed to move the sensor transportation unit 30 linearly on the rotation unit 20. The second driving device 60 includes a rotation frame 62, a second motor 64, a ball screw 66, a linear movement unit 67, and a wire 36.
The rotation frame 62 is fixed on the other end of the rotation shaft 40. Thus, the rotation frame 62 rotates while being engaged with the rotation shaft 40. The second motor 64 is fixed on the rotation frame 62. The second motor 64 includes a second encoder (not shown) for measuring the amount of rotation of the second motor 64 and transmitting a signal indicating the amount of rotation to the external controller so that the external controller can precisely control the second motor 64. The ball screw 66 is installed in the rotation frame 62, and connected to the second motor 64 in order to supply power to the linear movement unit 67. The linear movement unit 67 linearly moves along the ball screw 66 when the second motor 64 rotates. The wire 36 connects the sensor transportation unit 30 and the linear movement unit 67 like a loop. That is, the sensor transportation unit 30 and the linear movement unit 67 that are connected to each other via the wire 36 linearly move together. The wire 36 is tensely supported by either the rotation frame 62 or a plurality of rollers 70 included in the rotation unit 20. Thus, the sensor transportation unit 30 moves linearly on the rotation unit 20 according to the linear movement of the linear movement unit 67.
A method of measuring the magnetic field profile of an electromagnet of a closed-type cyclotron by using the magnetic field profile measuring apparatus 10 of FIG. 1 will now be described in detail.
First, it is assumed that as illustrated in FIG. 1, the magnetic field profile measuring apparatus 10 is installed in the closed-type cyclotron. The closed type cyclotron operates to generate a magnetic field in the iron yoke 12, and then, the first motor 52 operates. As an output shaft of the first motor 52 rotates, the belt 54 delivers a driving force to the disk gear 42 in order to rotate the disk gear 42. If the disk gear 42 rotates, then the rotation shaft 40 also rotates and the rotation unit 20 that is fixed on the rotation shaft 40 moves in the magnetic field in the iron yoke 12. During the movement of the rotation unit 20, the sensor 32 measures the intensity of the magnetic field and transmits the measurement result to the external controller. The first motor 52 repeatedly and alternately rotates clockwise by 360 and rotates anti-clockwise by 360 . Thus, the sensor 32 rotates similar to the first motor 52 to continuously measure the intensity of the magnetic field and to transmit the measurement result to the external controller. In the current embodiment, a step motor is used as the first motor 52, and the sensor 32 measures the intensity of the magnetic field at intervals of 0.04 , together with the first encoder. Also, the sensor 32 forms a measurement cell of a magnetic field at intervals of 10 mm along a direction of the radius of the electromagnet. While the rotation unit 20 rotates clockwise and anti- clockwise, the second driving device 60 moves the sensor transportation unit 30 linearly along a direction of the length of the rotation unit 20. More specifically, the rotation unit 20 rotates once by 360 degrees, the sensor transportation unit 30 is moved to a predetermined length along the direction of the length of the rotation unit 20, and then the rotation unit 20 rotates by 360 degrees in the opposite direction to measure the intensity of the magnetic field. In this case, the linear movement of the sensor transportation unit 30 according to an embodiment of the present invention will now be described.
First, the second motor 64 is driven. The linear movement unit 67 linearly moves due to the ball screw 66 connected to the second motor 64. In this case, the sensor transportation unit 30 connected to the linear movement unit 67 via the wire 36 linearly moves together with the linear movement unit 67. That is, the linear movement unit 67 moves linearly on the rotation frame 62, and the sensor transportation unit 30 connected to the linear movement unit 67 via the wire 36 also moves linearly along the guide rails 22 on the rotation unit 20. As described above, while the rotation unit 20 rotates and the sensor transportation unit 30 linearly moves, the distribution of a magnetic field generated by the electromagnet may be continuously measured.
In an experiment involving the magnetic field profile measuring apparatus 10, the first motor 52, the second motor 64, and the first and second encoders were used, a measurement cell of a magnetic field was set in the whole space 15 in the iron yoke 12 at intervals of 10 mm along a direction of the radius of the electromagnet and at intervals of 0.04 along the circumference of the electromagnet, and then 9000 data measurements were obtained whenever the rotation unit 20 rotates once. As a result, a total of 729000 data measurements were obtained by measuring the intensity of the magnetic field for one hour and twenty minutes.
As described above, the magnetic field profile measuring apparatus 10 is capable of precisely and rapidly measuring the intensity of a magnetic field in a space, e.g., an electromagnet of a closed-type cyclotron covered by an iron yoke, in which magnetic field profile measurements are difficult to be performed.
In the current embodiment, one of the support units 24 is disposed at both ends of the rotation unit 20 in order to prevent the rotation unit 20 from bending, and each of the support units 24 includes the first wheels 25 that rotate in contact with the iron yoke 12. However, the support units 24 may be omitted when the firmness of the rotation unit 20 is guaranteed.
In the current embodiment, the rotation unit 20 includes the guide rails 22 for guiding movement of the sensor transportation unit 30, and the sensor transportation unit 30 includes the second wheels 34 that rotate in contact with the guide rails 22, but the guide rails 22 or the second wheels 34 may be omitted, for example, when the sensor transportation unit 30 can slide smoothly on the rotation unit 20.
In the current embodiment, the first driving device 50 includes the rotation shaft 40, one end of which is fixed on the center of the rotation unit 20; the disk gear 42 that is fixed on the rotation shaft 40 and has teeth along the circumference thereof; the first motor 52 fixed on the iron yoke 12 in order to rotate the disk gear 42; and the belt 54 that connects the first motor 52 with the disk gear 42 so that the first motor 52 can supply power to the disk gear 42. However, the present invention is not limited thereto. For example, the first motor 52 of the first driving device 50 may be connected to the rotation unit 20 in order to directly drive the rotation unit 20. In this case, the first driving device 50 may not include all the elements described above.
In the current embodiment, the second driving device 60 includes the second motor 64, the ball screw 66 that is connected to the second motor 64 in order to supply power to the second motor 64, the linear movement unit 67 that moves linearly along the ball screw 66, and the wire 36 that connects the sensor transportation unit 30 with the linear movement unit 67. However, the present invention is not limited thereto. For example, even if the second driving device 60 does not include all the elements described above, the second driving device 60 may move the sensor transportation unit 30 by connecting the second motor 64 directly with the wire 36.
According to the above embodiments, a magnetic field profile measuring apparatus can measure the magnetic field profile of an electromagnet of a closed-type cyclotron covered by an iron yoke. A sensor for measuring the intensity of a magnetic field is installed in a sensor transportation unit that moves linearly on a rotation unit that rotates in the whole space in the iron yoke, thereby measuring the distribution of the magnetic field precisely and rapidly.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
A support unit may be installed at both ends of the rotation unit in order to prevent the rotation unit from bending. Each of the support units may include a first wheel that rotates in contact with the iron yoke.
The rotation unit may include a plurality of guide rails for guiding movement of the sensor transportation unit, and the sensor transportation unit may include a plurality of second wheels that rotate in contact with the guide rails.
The first driving device may include a rotation shaft, one end of which is fixed at the center of the rotation unit; a disk gear fixed on the rotation shaft, the disk gear including teeth along a circumference thereof; a first motor fixed on the iron yoke in order to rotate the disk gear and a belt for connecting the first motor with the disk gear so that the first motor supplies power to the disk gear.
The second driving device may include a second motor; a ball screw connected to the second motor; a linear movement unit moving linearly along the ball screw driven by the second motor; and a wire unit for connecting the sensor transportation unit with the linear movement unit like a loop. The sensor transportation unit may move linearly on the rotation unit according to linear movement of the linear movement unit.

Claims (5)

  1. An apparatus for measuring a magnetic field profile of a closed-type cyclotron having a cylindrical electromagnet, the apparatus comprising:
    a rotation unit disposed in a space in a plane at a center of an iron yoke, passing through the center of the iron yoke, and extending along a direction of a diameter of the iron yoke, the rotation unit being installed such that the rotation unit rotates with respect to the iron yoke;
    a sensor transportation unit combined with the rotation unit such that the sensor transportation unit moves forward or backward on the rotation unit along a direction of a length of the rotation unit, the sensor transportation unit being attached with a sensor for measuring intensity of a magnetic field;
    a first driving device for rotating the rotation unit; and
    a second driving device for moving the sensor transportation unit forward and backward on the rotation unit.
  2. The apparatus of claim 1, wherein a support unit is installed at both ends of the rotation unit in order to prevent the rotation unit from bending,
    wherein each of the support units comprises a first wheel that rotates in contact with the iron yoke.
  3. The apparatus of claim 1, wherein the rotation unit comprises a plurality of guide rails for guiding movement of the sensor transportation unit, and
    the sensor transportation unit comprises a plurality of second wheels that rotate in contact with the guide rails.
  4. The apparatus of claim 1, wherein the first driving device comprises:
    a rotation shaft, one end of which is fixed at the center of the rotation unit;
    a disk gear fixed on the rotation shaft, the disk gear comprising teeth along a circumference thereof;
    a first motor fixed on the iron yoke in order to rotate the disk gear and
    a belt for connecting the first motor with the disk gear so that the first motor supplies power to the disk gear.
  5. The apparatus of claim 1, wherein the second driving device comprises:
    a second motor;
    a ball screw connected to the second motor;
    a linear movement unit moving linearly along the ball screw driven by the second motor; and
    a wire unit for connecting the sensor transportation unit with the linear movement unit like a loop,
    wherein the sensor transportation unit moves linearly on the rotation unit according to linear movement of the linear movement unit.
PCT/KR2009/007254 2008-12-31 2009-12-07 Magnetic field profile measuring apparatus for electromagnet of closed-type cyclotron WO2010076980A2 (en)

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KR1020080138734A KR100996265B1 (en) 2008-12-31 2008-12-31 Magnetic field profile measuring apparatus for electromagnet of the closed type cyclotron

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