CN105425271A - Faraday detector for measuring sub-nanosecond order leading edge pulse electronic beam - Google Patents
Faraday detector for measuring sub-nanosecond order leading edge pulse electronic beam Download PDFInfo
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- CN105425271A CN105425271A CN201510908134.8A CN201510908134A CN105425271A CN 105425271 A CN105425271 A CN 105425271A CN 201510908134 A CN201510908134 A CN 201510908134A CN 105425271 A CN105425271 A CN 105425271A
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- collimating apparatus
- faraday detector
- electron beam
- sampling resistor
- metal support
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Abstract
The invention relates to a pulse electronic beam measuring apparatus, and specifically relates to a Faraday detector for measuring a sub-nanosecond order leading edge pulse electronic beam. The Faraday detector comprises a grounding housing, a collimator, a sampling resistor, a metal support and a charge collector, wherein the grounding housing is a cylindrical structure with openings at two ends; one end of the grounding housing is connected with an electronic beam source, and the other end of the grounding housing is provided with the collimator; the collimator is arranged in the inner wall at one end of the grounding housing; one end of the collimator is provided with a vacuum cable base and the other end of the collimator is connected with one end of the sampling resistor; the other end of the sampling resistor is connected with the metal support; and the charge collector is embedded in the center of the metal support, and is perpendicular to the incidence direction of an electronic beam. The Faraday detector for measuring a sub-nanosecond order leading edge pulse electronic beam has the advantages of being compact in the overall structure, being uniform in resistor distribution, being low in the loop inductance, being small in noise, being able to satisfy measurement of the sub-nanosecond order leading edge pulse electronic beam, and widening the measuring scope of the Faraday detector.
Description
Technical field
The present invention relates to a kind of pulsed electron beam measurement mechanism, be specifically related to a kind of faraday detector being applicable to magnitude of subnanosecond forward position pulsed electron beam and measuring.
Background technology
Faraday detector is the simple charged particle measurement mechanism of a kind of structure, is the common measurement mechanism that accelerator produces in electronic beam current diagnostic system.When charged particle is irradiated on faraday detector, accepted by charge-trapping body, produce exciting current, electric current flows through sampling resistor, forms loop, can be calculated the intensity of exciting current, and then draw the intensity of charged particle by the pressure drop that measuring resistance produces.Faraday detector based on this measuring principle often uses in plasma physics and beam physics, according to measuring object and the difference measuring object, has occurred various structures and form.But affect by factors such as loop inductance, distribution of resistance, time response and compact overall structure, general faraday detector can only measure the electronic beam current of nanosecond order forward position pulse, there is the defect of measurement range, the measurement requirement of more fast rise time electronic beam current can not be met.
Summary of the invention
The object of this invention is to provide a kind of faraday detector being applicable to magnitude of subnanosecond forward position pulsed electron beam and measuring, solve the technical matters that existing detecting devices measurement range is limited.
Technical solution of the present invention is: the detector provided comprises grounding shell, collimating apparatus, sampling resistor, metal support and charge-trapping body; Described grounding shell is the columnar structured of both ends open, and one end connects electron beam source, and the other end installs collimating apparatus; Described collimating apparatus is installed on the inwall place of grounding shell one end, and collimating apparatus one end arranges vacuum cable block, and the other end of collimating apparatus connects sampling resistor one end; The other end connection metal support of sampling resistor; Described metal support center is nested with the charge-trapping body perpendicular to electron beam incident direction, for collecting incident next electronics, and is converted into exciting current.
The outer circumference surface of above-mentioned collimating apparatus is provided with seal groove, for installing O-ring seal.
The outer circumference surface of above-mentioned collimating apparatus being provided with spiral pipe electromagnetic gasket groove, for installing metal species spiral pipe electromagnetic gasket, connecting sampling resistor and grounding shell.
Above-mentioned collimating apparatus and metal support are copper material, and conductive capability is strong.
Above-mentioned charge-trapping body is graphite material, and sublimation temperature is high, thermal capacity is large, resistance to line impacts, electric conductivity is good.
Above-mentioned sampling resistor adopts the mode uniform welding of multiple oxide film noninductive resistance parallel connection between collimating apparatus and metal support, reduces detector inductance.
Beneficial effect of the present invention:
(1) faraday detector compact overall structure provided by the invention, distribution of resistance is even, loop inductance is low, noise is little, meets the measurement of magnitude of subnanosecond forward position pulsed electron beam, has widened the measurement range of faraday detector.
(2) the present invention to be coordinated with concentric cable by O-ring seal and ensures that faraday detector and ambient atmosphere are isolated, and faraday detector inside is in vacuum environment.
(3) collimating apparatus of the present invention and metal support all adopt copper material, and conductive capability is strong, easy to process, is conducive to the welding of sampling resistor.
(4) the present invention uses graphite material as charge-trapping body, and sublimation temperature is high, thermal capacity is large, resistance to line impacts, electric conductivity is good and can bear certain physical strength.
Accompanying drawing explanation
Fig. 1 is present pre-ferred embodiments structural representation;
Fig. 2 is electronic beam current measuring system schematic diagram;
Fig. 3 is that the present invention tests the electronic beam current waveform recorded.
Embodiment
See Fig. 1, the detector entirety structure axisymmetricly of present pre-ferred embodiments.Grounding shell 8 is the columnar structured of both ends open, and one end connects electron beam source 9, and the other end installs collimating apparatus 1.Collimating apparatus 1 adopts metallic copper material, and external diameter is 50mm, is installed on the inwall place of grounding shell 8 one end, and effect ensures that whole detector is parallel with equipment.Collimating apparatus 1 one end toward the outer side arranges vacuum cable block 7, by connecting coaxial cable, beam current signal is sent to oscillograph, and its another one effect ensures that faraday detector and ambient atmosphere are isolated, and faraday detector is in vacuum environment.Collimating apparatus 1 welds pin one end of sampling resistor 2 on one end end face of inner side.The pin other end of sampling resistor 2 is welded in the rear end of metal support 3.The metallic copper material that metal support 3 adopts conductive capability stronger, center, front end is nested with charge-trapping body 4, and ensures that it is vertical with incident electron.Charge-trapping body 4 adopts the graphite material that sublimation temperature is high, thermal capacity is large, resistance to line impacts, electric conductivity is good, and for collecting incident next electronics, and be converted into exciting current, exciting current forms pressure drop after flowing through sampling resistor 2.The outer circumference surface that collimating apparatus 1 contacts with grounding shell 8 is provided with seal groove 6 and spiral pipe electromagnetic gasket groove 5.Plastic seal ring is placed in seal groove 6, adopts radial seal mode, and make detector inside place under vacuum conditions, vacuum tightness need lower than 1 × 10
-2handkerchief.Metal liner packing ring is placed in spiral pipe electromagnetic gasket groove 5, in order to reduce inductance, is ensureing that under the condition that sampling resistor 2 can weld, the diameter of spiral pipe electromagnetic gasket groove 5 is 1.6mm, is connected with grounding shell 8.Sampling resistor 2 adopts the oxide film noninductive resistance parallel way of 16 1 Ω, and in order to reduce inductance, resistance uniform welding is between collimating apparatus 1 and metal support 3, and be positioned as close to edge, resistance size is little, and in the present embodiment, the length of resistance is 3mm, diameter 1mm.The external diameter of metal support 3 as much as possible close to 50mm, should use 46mm in the present embodiment.Charge-trapping body 4 external diameter is 39mm, thick 3mm, selects scattering and radiation loss is little, large, the resistance to line of sublimation temperature high (3700 degrees Celsius), thermal capacity impacts, electric conductivity is good and can bear the graphite material of certain physical strength.Be fixed in collimating apparatus 1 by the screw of 4 diameter 3mm by vacuum cable block 7, the heart yearn of cable end is connected with the center of metal support 3.
See Fig. 2, electronic beam current measuring system one-piece construction is made up of TPG700 accelerator, faraday detector, vacuum pump, vacuum meter, data acquisition system (DAS) and computing machine.By faraday detector trapping charged particles, utilize vacuum pump extracting vacuum, utilize data acquisition system (DAS) to obtain electronic beam current intensity, then be connected by GPIB card with computing machine, far distance controlled, measurement and data processing can be realized.
In experimentation, electron beam source 9 electron emission, vertical irradiation is on detector, electronics is absorbed by charge-trapping body 4, produce exciting current when occurring to ionize and interact with collection body material and be prevented from, this electric current flows through sample resistance 2 and produces pressure drop, in the negligible situation of inductance, this pressure drop is directly proportional to electric current, transfers to oscillograph by coaxial wire.
See Fig. 3, faraday detector provided by the invention is used to carry out testing on the TPG700 accelerator of Xibei Nuclear Techn Inst and record electronic beam current waveform.In experiment, the vacuum tightness of faraday detector is 8.8 × 10
-3pa, feed vacuum tightness 4.1 × 10
-2pa, electronic beam current intensity 5kA, pulse front edge is 0.9ns, and this shows that faraday detector provided by the invention has recorded the electronic beam current of magnitude of subnanosecond pulse front edge, compensate for the defect that existing faraday detector exists measurement range deficiency, meet the measurement requirement of more fast rise time electronic beam current.
Claims (6)
1., for the faraday detector that magnitude of subnanosecond forward position pulsed electron beam is measured, it is characterized in that: described detector comprises grounding shell, collimating apparatus, sampling resistor, metal support and charge-trapping body;
Described grounding shell is the columnar structured of both ends open, and one end connects electron beam source, and the other end installs collimating apparatus;
Described collimating apparatus is installed on the inwall place of grounding shell one end, and collimating apparatus one end arranges vacuum cable block, and the other end of collimating apparatus connects sampling resistor one end; The other end connection metal support of sampling resistor;
Described metal support center is nested with the charge-trapping body perpendicular to electron beam incident direction.
2. the faraday detector measured for magnitude of subnanosecond forward position pulsed electron beam according to claim 1, is characterized in that: the outer circumference surface of described collimating apparatus is provided with seal groove, for installing O-ring seal.
3. the faraday detector measured for magnitude of subnanosecond forward position pulsed electron beam according to claim 2, it is characterized in that: the outer circumference surface of described collimating apparatus is provided with spiral pipe electromagnetic gasket groove, for installing metal species spiral pipe electromagnetic gasket, connect sampling resistor and grounding shell.
4. the faraday detector measured for magnitude of subnanosecond forward position pulsed electron beam according to claim 3, is characterized in that: described collimating apparatus and metal support are copper material.
5. the faraday detector measured for magnitude of subnanosecond forward position pulsed electron beam according to claim 4, is characterized in that: described charge-trapping body is graphite material.
6. according to the described faraday detector measured for magnitude of subnanosecond forward position pulsed electron beam arbitrary in claim 1 to 5, it is characterized in that: described sampling resistor adopts the mode uniform welding of multiple oxide film noninductive resistance parallel connection position near grounding shell between collimating apparatus and metal support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510908134.8A CN105425271B (en) | 2015-12-09 | 2015-12-09 | Faraday detector for the measurement of magnitude of subnanosecond forward position pulsed electron beam |
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|---|---|---|---|
| CN201510908134.8A CN105425271B (en) | 2015-12-09 | 2015-12-09 | Faraday detector for the measurement of magnitude of subnanosecond forward position pulsed electron beam |
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| CN105425271A true CN105425271A (en) | 2016-03-23 |
| CN105425271B CN105425271B (en) | 2018-02-09 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2491851Y (en) * | 2001-07-17 | 2002-05-15 | 西北核技术研究所 | Faraday detector for pA-level proton beam measurement |
| CN101470208A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Measuring system for nA/pA electronic beam current of impulse electron accelerator |
| CN102353978A (en) * | 2011-06-30 | 2012-02-15 | 南京理工大学 | Faraday cup sensing device used in electron beam processing beam quality test |
| CN102436009A (en) * | 2011-08-31 | 2012-05-02 | 南京理工大学 | Differential testing method of power density distribution of electron beam |
| CN202649475U (en) * | 2012-05-09 | 2013-01-02 | 上海精密计量测试研究所 | Device used for monitoring electron accelerator beam intensity in real time |
| CN103777227A (en) * | 2012-10-18 | 2014-05-07 | 上海原子科兴药业有限公司 | Cyclotron beam measuring device |
| KR20150114039A (en) * | 2014-03-31 | 2015-10-12 | 한국표준과학연구원 | Faraday cup assembly |
-
2015
- 2015-12-09 CN CN201510908134.8A patent/CN105425271B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2491851Y (en) * | 2001-07-17 | 2002-05-15 | 西北核技术研究所 | Faraday detector for pA-level proton beam measurement |
| CN101470208A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Measuring system for nA/pA electronic beam current of impulse electron accelerator |
| CN102353978A (en) * | 2011-06-30 | 2012-02-15 | 南京理工大学 | Faraday cup sensing device used in electron beam processing beam quality test |
| CN102436009A (en) * | 2011-08-31 | 2012-05-02 | 南京理工大学 | Differential testing method of power density distribution of electron beam |
| CN202649475U (en) * | 2012-05-09 | 2013-01-02 | 上海精密计量测试研究所 | Device used for monitoring electron accelerator beam intensity in real time |
| CN103777227A (en) * | 2012-10-18 | 2014-05-07 | 上海原子科兴药业有限公司 | Cyclotron beam measuring device |
| KR20150114039A (en) * | 2014-03-31 | 2015-10-12 | 한국표준과학연구원 | Faraday cup assembly |
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| CN105425271B (en) | 2018-02-09 |
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