低发射度L波段光阴极微波电子枪物理设计

李成龙; 汤振兴; 裴元吉

doi:10.11889/j.0253-3219.2016.hjs.39.090203

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低发射度L波段光阴极微波电子枪物理设计

低能加速器技术、射线技术及应用 | 更新时间：2021-05-24

- 低发射度L波段光阴极微波电子枪物理设计
- Physical design of low-emittance L-band photocathode microwave electron gun
- 核技术 2016年39卷第9期文章编号：090203
- 作者机构：
  
  中国科学技术大学国家同步辐射实验室合肥 230022
- 作者简介：
  
  [ "李成龙,男,1987年出生,2010年毕业于中国科技大学,现为硕士研究生,核科学与技术专业", "LI Chenglong, male, born in 1987, graduated from University of Science and Technology of China in 2010, master student, major in nuclear science and technique" ]
- 基金信息：
  
  国家高技术研究发展计划（863）项目(2013AA8122009B)
- DOI：10.11889/j.0253-3219.2016.hjs.39.090203
  中图分类号： TL503.5
- 收稿日期：2016-04-05，
  
  修回日期：2016-05-17，
  
  纸质出版日期：2016-09
- 稿件说明：
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李成龙, 汤振兴, 裴元吉. 低发射度L波段光阴极微波电子枪物理设计[J]. 核技术, 2016,39(9):090203

Chenglong LI, Zhenxing TANG, Yuanji PEI. Physical design of low-emittance L-band photocathode microwave electron gun[J]. Nuclear techniques, 2016, 39(9): 090203
李成龙, 汤振兴, 裴元吉. 低发射度L波段光阴极微波电子枪物理设计[J]. 核技术, 2016,39(9):090203 DOI： 10.11889/j.0253-3219.2016.hjs.39.090203.

Chenglong LI, Zhenxing TANG, Yuanji PEI. Physical design of low-emittance L-band photocathode microwave electron gun[J]. Nuclear techniques, 2016, 39(9): 090203 DOI： 10.11889/j.0253-3219.2016.hjs.39.090203.

摘要

太赫兹（THz）光源对电子束的能量、能散及发射度有极高要求，研发高性能电子源是基于自由电子激光（Free Electron Laser

FEL）的THz光源的重要挑战。对电子腔中束团发射度增长机制的研究，有助于设计针对有效的发射度补偿方案。本文首先描述了L波段光阴极微波电子枪腔的设计，利用POISSON Superfish软件给出了腔内电磁场分布，详细分析了束流发射度增长的因素，讨论发射度补偿原理。由此提出基于主副螺线管线圈抑制发射度增长的补偿方案，并用ASTRA程序对补偿效果进行模拟计算。结果表明，采用该补偿方案后，电子腔输出束团的能散和发射度有显著改善，达到THz光源对于电子源的要求。

Abstract

Background:

The development of high performance electron beam source has been a challenge for Free-electron Laser(FEL)based THz source which is critical for the energy

energy spread and emittance of the electron beam.

Purpose:

This work aims to find out the mechanism of emittance growth and developing a compensation technique for this emittance growth in the Radio Frequency(RF)gun cavity.

Methods:

First of all

a RF gun cavity is designed using POISSON Superfish to calculate its electro-magnetic field distribution for analysis of the emittance growth mechanism.Then

a compensation scheme is developed by employing a pair of solenoids to reduce the space charge emittance.Finally

the effectiveness of scheme is evaluated using the commonly used reliable simulation program ASTRA.

Results:

The simulation results show that the normalized transverse emittance of a 5.67-MeV electron bunch with 200 pC is reduced to 0.373 mm·mrad while the energy spread is reduced to 2.3‰.For a 5.67-MeV electron bunch with 1000 pC

the emittance and energy spread are reduced to 0.934 mm·mrad and 7.6‰

respectively.

Conclusion:

Simulation of the final design shows that the performance of the electron beam produced by the RF gun has achieved the requirements for THz source.

关键词

Keywords

references

LCLS-conceptual design report for the LCLS project[R/OL].2002. http://www-ssrl.slac.stanford.edu/lcls/cdr/, SLAC-R-593 http://www-ssrl.slac.stanford.edu/lcls/cdr/, SLAC-R-593

TESLA technical design report Part V:the X-ray free electron laser[R/OL].DESY, 2001. http://tesla.desy.de/new pages/TDR CD/PartV/xfel.html http://tesla.desy.de/new pages/TDR CD/PartV/xfel.html

Poole M W, Bennett S L, Bowler M A, et al.4GLS:a new type of fourth generation light source facility[C].Particle Accelerator Conference, Proceedings of the IEEE, 2003, 1:189-191.DOI:10.1109/PAC.2003.1288875

Corlett J N, Barletta W A, DeSantis S, et al.A recirculating linac-based facility for ultrafast X-ray science[C].Particle Accelerator Conference, Proceedings of the IEEE, 2003, 1:186-188.DOI:10.1109/PAC.2003.1289668

Park S J, Park J H, Parc Y W, et al.Status of PPI(Pohang Photo-Injector) for PAL XFEL[C].Proceedings of the 2005 Particle Accelerator Conference, IEEE, 2005:1733-1735.DOI:10.1109/PAC.2005.1590894

BESSY soft XFEL technical design report[R/OL].2004. https://www.helmholtz-berlin.de/media/media/grossgeraete/beschleunigerphysik/fel/fel_tdr_web.pdf https://www.helmholtz-berlin.de/media/media/grossgeraete/beschleunigerphysik/fel/fel_tdr_web.pdf

G R Neil , C L Bohn , S L Benson , . Sustained kilowatt lasing in a free-electron laser with same-cell energy recovery . Physical Review Letter , 2000 . 84 ( 4 ): 662 DOI: 10.1103/PhysRevLett.84.662 http://doi.org/10.1103/PhysRevLett.84.662 .

J F Wishart , A R Cook , J R Miller . The LEAF picosecond pulse radiolysis facility at Brookhaven National Laboratory . Review of Scientific Instruments , 2004 . 75 ( 11 ): 4359 - 4366 . DOI: 10.1063/1.1807004 http://doi.org/10.1063/1.1807004 .

Brown W J, Anderson S G, Barty C P, et al.Generation of high brightness X-rays with the PLEIADES Thomson X-ray source[C].Particle Accelerator Conference, Proceedings of the IEEE, 2003, 1:95-97.DOI:10.1109/PAC.2003.1288850

Conde M E, Gai W, Konecny R, et al.A high-charge high-brightness L-band photocathode RF gun[R].Argonne National Lab, IL(US), 2000

G L Carr , M C Martin , W R McKinney , . Very high power THz radiation at Jefferson Lab . Physics in Medicine and Biology , 2002 . 47 ( 21 ): 3761 DOI: 10.1088/0031-9155/47/21/313 http://doi.org/10.1088/0031-9155/47/21/313 .

黄文会 , 何小中 , 黄刚 , . 基于汤姆逊散射的X射线光源物理问题研究 . 高能物理与核物理 , 2004 . 28 ( 4 ): 446 - 450 . DOI: 10.3321/j.issn:0254-3052.2004.04.024 http://doi.org/10.3321/j.issn:0254-3052.2004.04.024 .

Wenhui HUANG , Xiaozhong HE , Gang HUANG , . Preliminary study of X-ray source based on Thomson scattering . High Energy Physics and Nuclear Physics , 2004 . 28 ( 4 ): 446 - 450 . DOI: 10.3321/j.issn:0254-3052.2004.04.024 http://doi.org/10.3321/j.issn:0254-3052.2004.04.024 .

刘圣广 , 李永贵 . 光阴极微波电子枪中发射度补偿及模拟计算 . 原子核物理评论 , 2002 . 19 ( 3 ): 338 - 341 . DOI: 10.3969/j.issn.1007-4627.2002.03.007 http://doi.org/10.3969/j.issn.1007-4627.2002.03.007 .

Shengguang LIU , Yonggui LI . Analysis of emittance compensation and simulation results to photo-cathode RF gun . Nuclear Physics Review , 2002 . 19 ( 3 ): 338 - 341 . DOI: 10.3969/j.issn.1007-4627.2002.03.007 http://doi.org/10.3969/j.issn.1007-4627.2002.03.007 .

魏献林 , 吴丛凤 . 减小直线加速器耦合腔中不对称性的方法 . 核技术 , 2013 . 36 ( 7 ): 070102 DOI: 10.11889/j.0253-3219.2013.hjs.36.070102 http://doi.org/10.11889/j.0253-3219.2013.hjs.36.070102 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract36.shtml .

Xianlin WEI , Congfeng WU . Reducing the asymmetry in coupled cavity of linear accelerator . Nuclear Techniques , 2013 . 36 ( 7 ): 070102 DOI: 10.11889/j.0253-3219.2013.hjs.36.070102 http://doi.org/10.11889/j.0253-3219.2013.hjs.36.070102 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract36.shtml .

Palmer D T.The next generation photo-injector[R].1998

K J Kim . RF and space-charge effects in laser-driven RF electron guns . Nuclear Instruments and Methods in Physics Research Section A:Accelerators, Spectrometers, Detectors and Associated Equipment , 1989 . 275 ( 2 ): 201 - 218 . DOI: 10.1016/0168-9002(89)90688-8 http://doi.org/10.1016/0168-9002(89)90688-8 .

B E Carlsten . New photoelectric injector design for the Los Alamos National Laboratory XUV FEL accelerator . Nuclear Instruments and Methods in Physics Research Section A:Accelerators, Spectrometers, Detectors and Associated Equipment , 1989 . 285 ( 1 ): 313 - 319 . DOI: 10.1016/0168-9002(89)90472-5 http://doi.org/10.1016/0168-9002(89)90472-5 .

何小中 , 唐传祥 , 黄文会 , . 光阴极电子枪中金属光阴极的热发射度研究 . 高能物理与核物理 , 2004 . 28 ( 9 ): 1007 - 1012 . DOI: 10.3321/j.issn:0254-3052.2004.09.021 http://doi.org/10.3321/j.issn:0254-3052.2004.09.021 .

Xiaozhong HE , Chuanxiang TANG , Wenhui HUANG , . Researches on thermal emittance of metal cathode in photo injectors . High Energy Physics and Nuclear Physics , 2004 . 28 ( 9 ): 1007 - 1012 . DOI: 10.3321/j.issn:0254-3052.2004.09.021 http://doi.org/10.3321/j.issn:0254-3052.2004.09.021 .

谢应猛 , 张善才 , 汤振兴 . 一种微波栅控直流电子枪初步物理设计 . 核技术 , 2015 . 38 ( 6 ): 060104 DOI: 10.11889/j.0253-3219.2015.hjs.38.060104 http://doi.org/10.11889/j.0253-3219.2015.hjs.38.060104 .

Yingmeng XIE , Shancai ZHANG , Zhenxing TANG . Preliminary physical design of a RF-gated gridded thermionic gun . Nuclear Techniques , 2015 . 38 ( 6 ): 060104 DOI: 10.11889/j.0253-3219.2015.hjs.38.060104 http://doi.org/10.11889/j.0253-3219.2015.hjs.38.060104 .

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