CN106094006B - A kind of high-precision Faraday cup - Google Patents
A kind of high-precision Faraday cup Download PDFInfo
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- CN106094006B CN106094006B CN201610614177.XA CN201610614177A CN106094006B CN 106094006 B CN106094006 B CN 106094006B CN 201610614177 A CN201610614177 A CN 201610614177A CN 106094006 B CN106094006 B CN 106094006B
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- faraday cup
- main body
- secondary electron
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
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Abstract
The invention belongs to cyclotron technical fields, more particularly to a kind of high-precision Faraday cup, including Faraday cup main body, wherein, it further include that the secondary electron being arranged on the outside of the Faraday cup body openings inhibits bias electrode, the intracorporal hollow pyramidal structure of the Faraday cup master is set, and the pyramidal structure can be such that the secondary electron generated in the Faraday cup main body does not launch outward along the central axes of the Faraday cup main body.Existing Faraday cup device effectively can not avoid secondary electron from escaping, and easily fever damages.It is simple using high-precision Faraday cup structure provided by the present invention, it occupies little space, secondary electron evolution can be effectively reduced, the advantages of improving measurement accuracy, structure design simultaneously can increase the thermal capacity of Faraday cup, safety is improved, can be widely applied to the measurement in proton therapeutic field beam intensity, and there is the value promoted the use of to related fields.
Description
Technical field
The invention belongs to cyclotron technical fields, and in particular to a kind of high-precision Faraday cup.
Background technique
Cyclotron is so that charged particle is made circumnutation jointly using magnetic field and electric field, during exercise through high-frequency electric field
The device accelerated repeatedly is the important instrument in high-energy physics, and wherein superconducting cyclotron is that current medical proton therapeutic adds
The core equipment of fast device.Medical proton therapy accelerator can be realized swollen with the proton in microcosmos, Heavy ion beam treatment
Tumor, is the most advanced radiation therapy technology in the world today, and only individual developed countries grasp and apply the technology.The country has been opened up
Open but temporarily have not been completed the development work of superconducting cyclotron.
Beam intensity is one of very important beam parameters in accelerator, in medical proton therapy accelerator, line
Intensity is not only directly related to the quality and effect for the treatment of, but also is related to the life security of patient.It is controlled carrying out proton to patient
When treatment, the beam intensity measuring device using unobstructed type is needed.To the beam intensity measuring device of unobstructed type, need using
High-precision Faraday cup calibrates its measured value accordingly.
Existing Faraday cup mostly uses secondary electron to inhibit bias to prevent secondary electron evolution Faraday cup from causing to survey
The deviation of amount, while preventing secondary electron from escaping using the method for increasing Faraday cup length.Permanent magnet can also be used, utilize magnetic
Field inhibits secondary electron, such as secondary electron to 10eV kinetic energy, and in the magnetic field of 10mT, moving radius is 1mm left
It is right, it is ensured that secondary electron does not escape out Faraday cup.But no matter electricity inhibit or magnetic inhibit, to secondary on Faraday cup center line
It is all poor that electronics escapes most apparent its inhibitory effect of region, and permanent magnet deposits failure under the influence of heat.
Summary of the invention
Currently, domestic many units carry out high-precision to proton beam intensity of flow in the correlative study for carrying out proton therapeutic
The Faraday cup device of measurement has broad application prospects.Since proton therapeutic appts structure is compact to design, how
The direct precise measurement to beam intensity is realized in the confined space and dress is measured to the beam intensity of unobstructed type on this basis
It sets calibrate and have very important significance.The evolution of secondary electron present in existing Faraday cup device and fever etc. are asked
Topic, is unable to satisfy the design requirement of proton therapeutic instrument.
For the demand, the present invention is intended to provide a kind of structure is simple, occupies little space, is cheap, effectively reducing
On Faraday cup center line secondary electron escape and reduce the high-precision Faraday cup device of fever for proton therapeutic convolution plus
The measurement of fast device beam intensity.
To achieve the above objectives, the technical solution adopted by the present invention is that a kind of high-precision Faraday cup, including Faraday cup
Main body, wherein further include that the secondary electron being arranged on the outside of the Faraday cup body openings inhibits bias electrode, be arranged in institute
The intracorporal hollow pyramidal structure of Faraday cup master is stated, the pyramidal structure can make generate in the Faraday cup main body two
Secondary electronics will not be launched outward along the central axes of the Faraday cup main body.
Further, the pyramidal structure and the Faraday cup main body are coaxial, and the opening direction of heavy caliber one end is tested beam
The injection direction of stream, small-bore one end are connected with the Faraday cup main body.
Further, the Faraday cup main body, the production material of pyramidal structure are copper.
Further, water cooling pipeline is equipped in the bottom of the other end of the Faraday cup main body far from opening.
Further, penetrating in material is made used by the Faraday cup main body according to the particle of tested line
Journey, the thickness of the Faraday cup bottom part body are greater than the range, and the water cooling pipeline is arranged except the range, avoids
Cooling water in the water cooling pipeline is activated.
It further, further include that the secondary electron is arranged in inhibit bias electrode far from the Faraday cup body side
Protective grounding electrode.
The beneficial effects of the present invention are: used Faraday cup has structure simple, occupies little space, can effectively subtract
The advantages of few secondary electron evolution, raising measurement accuracy, while structure design can increase the thermal capacity of Faraday cup, improve
Safety；When beam energy is concentrated, it can effectively disperse beam energy, prevent local temperature is excessively high from damaging；It can be extensive
Applied to the measurement in proton therapeutic field beam intensity, and there is the value promoted the use of to related fields.
Detailed description of the invention
Fig. 1 is the schematic diagram of high-precision Faraday cup described in the specific embodiment of the invention；
Fig. 2 is the working principle diagram of Faraday cup described in the specific embodiment of the invention；
In figure: 1- protective grounding electrode, 2- secondary electron inhibition bias electrode, 3- pyramidal structure, 4- Faraday cup main body,
5- water cooling pipeline, 6- amplifying circuit, 7-PLC data acquisition module, 8- control computer, 9- proton beam.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of high-precision Faraday cup provided by the invention, including Faraday cup main body 4, wherein also wrap
The secondary electron inhibition bias electrode 2 that 4 open outer side of Faraday cup main body is set is included, is arranged in Faraday cup main body 4
Hollow pyramidal structure 3, pyramidal structure 3 can make the secondary electron generated in Faraday cup main body 4 will not be along Faraday cup master
The central axes of body 4 launch outward.
Pyramidal structure 3 and Faraday cup main body 4 are coaxial, and the opening direction of heavy caliber one end is tested the injection direction of line,
Small-bore one end is connected with Faraday cup main body 4.To the secondary electron that tested proton beam incidence generates, flux and cos
θ directly proportional (angle that θ is electron emission track and emitting surface), energy is usually less than 10eV.It is adopted in Faraday cup main body 4
With pyramidal structure 3, due to such design feature, the secondary electron of generation will not be launched outward along the central axes of Faraday cup,
And the central axes of Faraday cup are exactly the region that secondary electron inhibits biasing effect poor.Pyramidal structure 3 can also have very much
The dispersion beam energy of effect prevents the excessively high damage for causing Faraday cup of local temperature.
Faraday cup main body 4, the production material of pyramidal structure 3 are copper.
It is equipped with water cooling pipeline 5 in the bottom of the other end of the Faraday cup main body 4 far from opening, using cooling water to faraday
Cylinder is cooled down.The range made used by Faraday cup main body 4 in material according to the particle of tested particle beam carries out
It calculates, the thickness of 4 bottom of Faraday cup main body needs to be greater than above-mentioned range, and (Fig. 1 is arranged except the range in water cooling pipeline 5
Middle R is range), the cooling water that can be avoided in water cooling pipeline 5 is activated.In the present embodiment, Faraday cup main body 4 uses copper
Material production, range of the proton in copper in surveyed proton beam are 57mm, therefore water cooling pipeline 5 and Faraday cup main body 4
The setting distance of bottom is more than 57mm (i.e. R > 57mm).
High-precision Faraday cup provided by the invention further includes being arranged to inhibit bias electrode 2 far from farad in secondary electron
The protective grounding electrode 1 of the main body, 4 side.Secondary electron inhibition electrode 2 uploads the negative high voltage of addend hectovolt, can be further
It prevents secondary electron from escaping Faraday cup, guarantees the accuracy of measurement result.Before secondary electron inhibits electrode 2, it is equipped with and protects
Grounding electrode 1 is protected, secondary electron can be reduced and inhibit influence of the bias to incident tested proton beam, and prevent spuious line
Secondary electron is caused to inhibit the short circuit between bias electrode 2 and Faraday cup main body 4.
As shown in Fig. 2, acquiring mould by plc data using control computer 8 when needing to measure proton beam 9
Block 7 is controlled high-precision Faraday cup provided by the invention, and high-precision Faraday cup is moved to work using pneumatic device
Make position, 9 energy of proton beam is deposited on completely in high-precision Faraday cup, and output signal passes through vacuum adapter and amplifying circuit
6 input terminals are connected, and amplified beam intensity signal is sent into plc data acquisition module 7 and completes line by control computer 8
The display of intensity.
Device of the present invention is not limited to embodiment described in specific embodiment, those skilled in the art according to
Technical solution of the present invention obtains other embodiments, also belongs to the scope of the technical innovation of the present invention.
Claims (3)
1. a kind of high-precision Faraday cup, including Faraday cup main body (4), it is characterized in that: further including being arranged in the faraday
The secondary electron of cylinder main body (4) open outer side inhibits bias electrode (2), is arranged hollow in the Faraday cup main body (4)
Pyramidal structure (3), the pyramidal structure (3) can make the secondary electron generated in the Faraday cup main body (4) will not edge
The central axes of the Faraday cup main body (4) launch outward；The pyramidal structure (3) and the Faraday cup main body (4) coaxially,
Towards the injection direction for being tested line, small-bore one end is connected the opening of heavy caliber one end with the Faraday cup main body (4)；Institute
State Faraday cup main body (4), the production material of pyramidal structure (3) is copper；The Faraday cup main body (4) is another far from opening
The thickness of the bottom at end is greater than 57mm；It further include setting in the separate described faraday of secondary electron inhibition bias electrode (2)
The protective grounding electrode (1) of cylinder main body (4) side.
2. high-precision Faraday cup as described in claim 1, it is characterized in that: in the Faraday cup main body (4) far from opening
The other end bottom be equipped with water cooling pipeline (5).
3. high-precision Faraday cup as claimed in claim 2, it is characterized in that: according to the particle of tested line in the faraday
The thickness of range in production material used by cylinder main body (4), Faraday cup main body (4) bottom is greater than the range,
The water cooling pipeline (5) is arranged except the range, and the cooling water in the water cooling pipeline (5) is avoided to be activated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614177.XA CN106094006B (en) | 2016-07-29 | 2016-07-29 | A kind of high-precision Faraday cup |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614177.XA CN106094006B (en) | 2016-07-29 | 2016-07-29 | A kind of high-precision Faraday cup |
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| Publication Number | Publication Date |
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| CN106094006A CN106094006A (en) | 2016-11-09 |
| CN106094006B true CN106094006B (en) | 2019-08-06 |
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| CN201610614177.XA Active CN106094006B (en) | 2016-07-29 | 2016-07-29 | A kind of high-precision Faraday cup |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181641B (en) * | 2018-01-04 | 2019-10-11 | 北京航空航天大学 | Faraday probe |
| CN110246736B (en) * | 2019-06-28 | 2020-09-08 | 华中科技大学 | Multi-page Faraday cup and measuring method |
| CN112987076B (en) * | 2021-02-07 | 2022-08-16 | 中国科学院近代物理研究所 | Stream intensity detection system for weak beam current |
| CN113484899B (en) * | 2021-06-29 | 2022-06-28 | 中国科学院近代物理研究所 | Wire target and device for detecting toe-in halo and section of target |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2796082Y (en) * | 2005-03-31 | 2006-07-12 | 北京中科信电子装备有限公司 | Faraday device for detecting bundle |
| KR100679263B1 (en) * | 2005-09-22 | 2007-02-05 | 삼성전자주식회사 | Faraday system and ion implanter used same |
| CN205880234U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | High accuracy faraday cylinder |
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| CN106094006A (en) | 2016-11-09 |
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