CN209992683U - Beam detection structure for cyclotron - Google Patents
Beam detection structure for cyclotron Download PDFInfo
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- CN209992683U CN209992683U CN201920777916.6U CN201920777916U CN209992683U CN 209992683 U CN209992683 U CN 209992683U CN 201920777916 U CN201920777916 U CN 201920777916U CN 209992683 U CN209992683 U CN 209992683U
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Abstract
The utility model discloses a beam detection structure for a cyclotron, which relates to the technical field of the cyclotron and comprises a carbon film detection structure at least arranged at an outlet of an acceleration cavity; the carbon film detection structure comprises a graphite probe connected with a lead; the graphite probe is arranged on the carbon film, and an insulating ring is arranged between the graphite probe and other structures. The utility model discloses the beam intensity that detects is more accurate.
Description
Technical Field
The utility model relates to a cyclotron technical field, concretely relates to be used for detecting the detection structure of beam intensity in the cyclotron more accurately.
Background
A cyclotron is a device which uses a magnetic field and an electric field to make charged particles perform a cyclotron motion together and repeatedly accelerates the charged particles in the motion by a high-frequency electric field, and is an important instrument in high-energy physics.
The operating principle of the cyclotron is that micro-particles are accelerated to a certain energy under the combined action of an electric field and a magnetic field, and the beam intensity is a basic parameter value for measuring the energy obtained by the micro-particles. For this reason, the detection of beam current intensity is critical to the performance of a cyclotron.
The existing cyclotron usually performs beam intensity detection at the following positions: (1) target in the center region: for measuring ion source outlet beam current intensity, (2) stripping target: for measuring the beam intensity exiting the acceleration chamber, (3) target: for measuring the beam intensity actually bombarded on a target placed at the exit of the acceleration chamber.
However, in practical application, parameters of each part of the accelerator change after a period of time due to various reasons, so that the ratio of the beam intensity of the target in the central area to the beam intensity on the stripping target is reduced, the required beam intensity of the stripping target cannot reach the designed value, and the normal use of the accelerator is seriously influenced. Therefore, a more accurate beam intensity detection structure is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it is anticipated that a beam detection structure for cyclotron is intended to solve because the target diminishes and leads to beam intensity to detect unsafe problem on target and the strip target in the center.
In order to solve the above problems, the following scheme is provided:
the beam detection structure for the cyclotron in the scheme comprises an inner target detection structure and a target body detection structure; the carbon film detection structure is at least arranged at the outlet of the acceleration cavity and comprises a graphite probe connected with a lead; the graphite probe is arranged on the carbon film, and an insulating ring is arranged between the graphite probe and other structures.
The scheme has the advantages that:
the scheme has various structures for beam detection, and can increase the accuracy of beam intensity detection as much as possible. Meanwhile, the carbon film detection structure detects the beam intensity at the outlet of the acceleration cavity. The insulating ring is arranged between the graphite probe and other structures, so that an electric signal detected by the graphite probe can be transmitted out through a lead in a nondestructive mode to the maximum extent, the accuracy of beam intensity detected by the carbon film detection structure is improved, and the accuracy of beam intensity detection in the whole cyclotron is further improved.
Further, the graphite probe is connected with a clamping piece, and the clamping piece clamps the carbon film and exposes part of the carbon film.
The graphite probe was connected to the holder so that it could be mounted on the carbon film. Meanwhile, the clamping piece exposes part of the carbon film, so that the normal work of the carbon film is prevented from being influenced.
Furthermore, the clamping piece is connected with a first rotating rod for driving the clamping piece to rotate.
Through first rotary rod, make the holder, rotatory together with the graphite probe who is connected with it, conveniently adjust the graphite probe to the position that needs and detect.
Further, the inner target detection structure comprises a telescopic inner target detection structure.
The inner target detection structure comprises a telescopic inner target detection structure, and detection of beam intensity can be conveniently carried out by selecting different telescopic lengths according to different design standards of the cyclotron.
Furthermore, the telescopic inner target detection structure comprises a beam measuring probe and a telescopic mechanism which is used for driving the beam measuring probe to radially stretch in the acceleration cavity.
Through telescopic machanism, drive and restraint survey probe and can detect on accelerating radial each position in chamber.
Further, the telescopic mechanism comprises a lead screw and a lead screw seat which are connected in a matched manner; the lead screw seat drives the beam measuring probe to move.
The telescopic mechanism can be stretched by the relative movement of the screw rod and the screw rod seat. The lead screw seat moves to drive the beam measuring probe to move.
Furthermore, the telescopic mechanism also comprises a guide rail system used for enabling the lead screw seat to move radially relative to the accelerating cavity.
Through the guide rail system, the movement of the screw rod and the screw rod seat is limited, so that the movement of the screw rod seat is in the radial position of the acceleration cavity, and the beam measuring probe is telescopic along the radial position of the acceleration cavity.
Further, the guide rail system comprises at least two guide rails which are used for being connected with the screw rod seat in a sliding mode.
The moving direction of the screw seat can be made to be along the arrangement direction of the two guide rails through the two guide rails which are in sliding connection with the screw seat.
Furthermore, a vacuum sealing flange is arranged at the joint of the telescopic mechanism and the accelerating cavity.
Through the vacuum sealing flange, the vacuum environment in the accelerating cavity can not be influenced when the telescopic mechanism performs telescopic motion.
Further, the screw rod is connected with a second driving motor for driving the screw rod to rotate
The second driving motor drives the screw rod to rotate, so that the screw rod seat and the screw rod move relatively, and the purpose of enabling the telescopic mechanism to perform telescopic motion is achieved.
Drawings
Fig. 1 is a schematic structural view of a cyclotron equipped with a beam current detection structure in embodiment 1.
Fig. 2 is a schematic structural view of a carbon film detection structure in example 1.
FIG. 3 is a top view of the telescopic inner target detection structure in example 1.
Fig. 4 is a side view of fig. 3.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a central zone deflection plate 1, a stripping target 2, a radio frequency D box 3, a coupling capacitor 5, a radio frequency final power amplifier 6, a vacuum pump 7, an acceleration cavity wall 8, a magnet 9, a beam outlet 10, a conversion box 11, a PLC (programmable logic controller) 12, a computer 13, a graphite probe 20, a carbon film 21, a first rotating rod 22, a three-way sealing flange 23, a first lead interface 24, a first vacuum rotating introducer 25, a first driving motor 26, a beam measuring probe 30, a vacuum linear introducer 31, a guide rail 32, a guide plate 33, a lead screw seat 34, a lead screw 35, a second lead interface 36, a second driving motor 37 and an ion source 50.
Example 1
The cyclotron used in example 1 is substantially as shown in figure 1: the ion source device comprises an ion source, an axial injection system, an accelerating cavity and a target system, wherein the accelerating cavity comprises a magnetic field system, a high-frequency system, a stripping system, a central area and a main vacuum system as shown in figure 1.
In the conventional cyclotron, the ion source extends into the acceleration chamber from bottom to top, that is, the ion source is axial or the book incense is inserted into the acceleration chamber. Wherein the magnetic field system comprises a magnet 9 arranged in the acceleration chamber wall 8. The high-frequency system comprises two radio frequency D boxes 3, a tuning capacitor arranged at one end of each of the two radio frequency D boxes 3, and a coupling capacitor 5 arranged at the other end of each of the radio frequency D boxes, wherein the coupling capacitor 5 is connected with a radio frequency final-stage power amplifier 6, a central area deflection plate 1 is arranged in the central area, the radio frequency D boxes 3 are symmetrically arranged at two sides of the central area deflection plate 1, two vacuum pumps 7 are arranged at two sides of the central area deflection plate 1, and a beam outlet 10 is arranged on an acceleration cavity wall 8.
The target system of the prior cyclotron comprises two stripping targets 2 symmetrically arranged at two sides of an accelerating cavity, a conversion box 11, a PLC 12 and a computer 13, wherein the stripping targets 2 are sequentially connected.
As shown in fig. 1, the beam current detection structure for a cyclotron of the present embodiment is installed in a cyclotron, and compared with an existing cyclotron, the installed cyclotron uses a radial injection system, and an ion source 50 is transversely inserted into an acceleration cavity, which is not only beneficial to installation of the ion source, but also beneficial to beam current concentration. The peeling target 2, i.e., the carbon film, is inserted in the axial direction from the bottom up through the magnet structure. The peeling target 2 is electrically connected to the converting box 11, the PLC controller 12, the computer 13, and the like at the bottom end thereof after extending out of the magnet 9. Compared with the conventional cyclotron shown in fig. 1, the cyclotron installed in this embodiment has four magnets 9 (the fan-shaped deep valley structure refers to both the fan-shaped peak region and the fan-shaped valley region) with fan-shaped deep valley structures installed symmetrically with each other, and the radio frequency D-box 3, the tuning capacitor, the coupling capacitor 5, and the radio frequency final stage power amplifier 6 are all vertically installed above or below the magnets 9. Fig. 1 is a schematic view of the upper cover plate when it is opened from above. In the cyclotron installed in the present embodiment, a total of six vacuum pumps 7 are installed, wherein four vacuum pumps 7 are installed on the upper cover plate, and for convenience of viewing, the vacuum pumps 7 are drawn in fig. 1.
The beam detection structure for the cyclotron comprises an inner target detection structure, a target body detection structure and a carbon film detection structure arranged at the outlet of an acceleration cavity.
The cyclotron in this embodiment has two beam outlets 10 and therefore two stripping targets 2. In this embodiment, a carbon film detection structure is mounted on the peeling target near the exit of the accelerator chamber.
As shown in FIG. 2, the carbon film detection structure comprises a graphite probe 20 mounted on a carbon film 21 and exposing most of the carbon film 21, the graphite probe 20 being welded to a holder member which is sandwiched between the carbon film and exposes part of the carbon film, so that the graphite probe 20 can directly contact the carbon film 21 without shielding the carbon film 21. The clamping piece is welded with a first rotating rod 22, the first rotating rod 22 is of a hollow structure, and a lead welded with the graphite probe 21 penetrates through a three-way sealing flange 23 welded with the first rotating rod 22 and then is connected with an electric structure (such as the PLC 12 and the computer 13) through a first lead interface 24. An insulating ring is arranged between the graphite probe 20 and the first rotating rod 22, so that the energy loss of an electric signal detected by the graphite probe 20 is avoided, and the electric signal detection of the graphite probe 20 can be more accurate.
The right end of the three-way sealing flange 23 is welded with a first vacuum rotary importer 25, the right end of the first vacuum rotary importer 25 is connected with a first driving motor 26 through a screw, the first vacuum rotary importer 25 is driven by the first driving motor 26 to drive a first rotary rod 22 to rotate under the obstruction as less as possible, so that a clamping piece connected with the first rotary rod and the graphite probe 20 rotate. Because the first vacuum rotary introducer is connected, air obstruction is reduced, the whole rotary energy loss is reduced, the rotating angle is controlled more accurately, and the graphite probe 20 is conveniently adjusted to a required position.
The graphite probe 20 is used to measure electrical signals; the three-way sealing flange 23 is used for sealing vacuum and installing a first wire interface 24(BNC interface); a first vacuum rotary introducer 25 to provide rotational force and sealing vacuum; the first drive motor 26 is used to provide a driving force and to precisely control the rotation angle.
Compared with the current beam intensity of the target detection ion source outlet in the common central area, namely the beam intensity of the acceleration cavity outlet, the carbon film detection structure is directly adopted, and the beam intensity detection at the position can be more accurately completed.
The inner target detection structure in this embodiment includes a telescopic inner target detection structure.
As shown in fig. 3 and 4, the telescopic internal target detection structure includes a beam measuring probe 30, a vacuum linear introducer 31, a guide rail system, a vacuum sealing flange, a second lead interface 36, a lead screw 35 and a second driving motor 37.
The guide rail system comprises a frame in a semi-surrounding structure, the frame comprises a guide plate 33 at the front end and a connecting plate at the rear end, two guide rails 32 are welded on two sides of the connecting plate and the guide plate, and a bottom plate is further welded at the bottom ends of the connecting plate and the guide plate 33. A screw 35 is installed between the two guide rails 32 at the center positions of the connecting plate and the guide plate 33, a screw base 34 moving back and forth along the screw 35 is installed on the screw 35, and meanwhile, the two sides of the screw base 34 are slidably connected with the two guide rails 32 and move back and forth along the guide rails 32. The rear end of the lead screw 35 is connected to a second drive motor 37 through a connecting plate.
The beam probe 30 communicates with a vacuum line introducer 31 through a mount. The center of the guide plate 33 is provided with a hole, and the vacuum linear introducer 31 passes through the guide plate 33 and is welded with the lead screw seat 34. The second driving motor 37 drives the lead screw 35 to rotate, and the lead screw 35 drives the lead screw base 34 to move back and forth along the guide rail 32, so as to push the vacuum linear introducer 31 and the beam measuring probe 30 to move back and forth in a telescopic manner.
The lead wire welded with the beam measuring probe 30 passes through the mounting piece and the vacuum linear introducer 31, enters the lead screw seat 34, extends out of a second lead wire interface 36(BNC lead wire interface) formed on the lead screw seat 34 and then is connected with other electric structures.
The beam measuring probe 30 is used for measuring an electric signal formed by particle impact in the acceleration cavity; the vacuum sealing flange is used for sealing a gap between the vacuum linear introducer 31 and the wall of the acceleration cavity to ensure the vacuum in the acceleration cavity; the vacuum line introducer 31 is used to provide a telescopic drive and sealing vacuum; the second driving motor 37 is used to provide a driving force and to precisely control the telescopic angle.
The telescopic inner target detection structure can extend into an acceleration cavity through a vacuum flange, and the beam measuring probe 30 can extend into any radial position of the acceleration cavity through the movement of the screw rod seat 34, so that the beam intensity of each radius can be conveniently detected, and the detection result is more accurate.
The first vacuum rotary introducer 25 and the vacuum linear introducer 31 are all manufactured by products sold on the market, and the specific models can be selected according to price ranges, such as related products of orientalmotor company and related products of great alignment science and technology, which are not described herein again.
The target detection structure in this embodiment is similar to the existing target detection structure, and therefore, the detailed structure thereof is not repeated herein.
The specific implementation process is as follows:
in the embodiment, the whole cyclotron can detect the beam intensity at the outlet of the acceleration cavity through the carbon film detection structure, and can detect the beam intensity at each position of the acceleration cavity through the telescopic inner target detection structure; in addition, the target body detection structure arranged on the target body detects the beam intensity actually shot on the target body, and can accurately detect and track the beam intensity of the whole cyclotron in time. The accuracy of the cyclotron on beam intensity design can be effectively guaranteed.
In the carbon film detection structure, negative hydrogen ions are stripped into two electrons to become protons after passing through the original stripped carbon film of the cyclotron, at the moment, the curvature of the track is reversed under the condition that the size and the direction of a magnetic field are kept unchanged as the negative ions are changed into positive ions, and the protons are led out of the accelerator, namely proton beams are led out along the leading-out track; electrons are directly deposited on the carbon film after stripping, and since two electrons are lost on the stripping film by each negative hydrogen ion, a clear correspondence exists, so that the measured current corresponds to how many electrons are deposited on the stripping film in unit time. The current signal is transmitted to an upper computer to complete calculation or display, so that online real-time monitoring is realized, and the influence on the beam current for leading out protons is avoided. The utility model discloses a design the mounting structure of carbon film and realized the collection of beam intensity signal, simple structure, convenient operation is favorable to long-time operation and the experimental development of physics experiment terminal of proton cyclotron.
Example 2
The difference from embodiment 1 is that in this embodiment, the clamping member is pure aluminum, which is also a good conductor, the graphite probe 20 is welded with the lead wire through the clamping member welded thereto, and the lead wire is connected with other electrical structures through the first rotating rod 22. The clamping piece is directly made of a good conductor, so that the problem of installation of the graphite probe 20 is solved, the problem of electrical connection is solved, and the installation is convenient.
Example 3
In contrast to embodiment 1, the carbon film detection structure in this embodiment is mounted on two peeling targets 2, respectively. Close to the stream inlet and the stream outlet 10.
The descriptions in the above embodiments and the like can be used to explain the contents of the claims.
Claims (10)
1. The beam detection structure for the cyclotron comprises an inner target detection structure and a target body detection structure; the method is characterized in that: the carbon film detection structure is at least arranged at the outlet of the acceleration cavity and comprises a graphite probe connected with a lead; the graphite probe is arranged on the carbon film, and an insulating ring is arranged between the graphite probe and other structures.
2. The beam detecting structure for a cyclotron according to claim 1, wherein: the graphite probe is connected with a clamping piece, and the clamping piece clamps the carbon film and exposes part of the carbon film.
3. The beam detecting structure for a cyclotron according to claim 2, wherein: the clamping piece is connected with a first rotating rod for driving the clamping piece to rotate.
4. The beam detecting structure for a cyclotron according to claim 1, wherein: the inner target detection structure comprises a telescopic inner target detection structure.
5. The beam detecting structure for a cyclotron according to claim 4, wherein: the telescopic inner target detection structure comprises a beam measuring probe and a telescopic mechanism for driving the beam measuring probe to radially stretch in an acceleration cavity.
6. The beam detecting structure for a cyclotron according to claim 5, wherein: the telescopic mechanism comprises a lead screw and a lead screw seat which are connected in a matching way; the lead screw seat drives the beam measuring probe to move.
7. The beam detecting structure for a cyclotron according to claim 6, wherein: the telescopic mechanism further comprises a guide rail system used for enabling the lead screw seat to move radially relative to the accelerating cavity.
8. The beam detecting structure for a cyclotron according to claim 7, wherein: the guide rail system comprises at least two guide rails which are used for being connected with the lead screw base in a sliding mode.
9. The beam detecting structure for a cyclotron according to claim 5, wherein: and a vacuum sealing flange is arranged at the joint of the telescopic mechanism and the accelerating cavity.
10. The beam detecting structure for a cyclotron according to claim 6, wherein: the screw rod is connected with a second driving motor which drives the screw rod to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920777916.6U CN209992683U (en) | 2019-05-27 | 2019-05-27 | Beam detection structure for cyclotron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920777916.6U CN209992683U (en) | 2019-05-27 | 2019-05-27 | Beam detection structure for cyclotron |
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| Publication Number | Publication Date |
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| CN209992683U true CN209992683U (en) | 2020-01-24 |
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| CN201920777916.6U Active CN209992683U (en) | 2019-05-27 | 2019-05-27 | Beam detection structure for cyclotron |
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