Design, measurement and optimization of undulator for terahertz free electron laser

Yan Longgang; Deng Derong; Zhang Hao; Zhang Wei; Zhang Jidong; Yang Xingfan; Li Ming

doi:10.11884/HPLPB201830.180247

Volume 30 Issue 11

Nov. 2018

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Yan Longgang, Deng Derong, Zhang Hao, et al. Design, measurement and optimization of undulator for terahertz free electron laser[J]. High Power Laser and Particle Beams, 2018, 30: 113101. doi: 10.11884/HPLPB201830.180247

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Yan Longgang, Deng Derong, Zhang Hao, et al. Design, measurement and optimization of undulator for terahertz free electron laser[J]. High Power Laser and Particle Beams, 2018, 30: 113101. doi: 10.11884/HPLPB201830.180247

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Design, measurement and optimization of undulator for terahertz free electron laser

doi: 10.11884/HPLPB201830.180247

1.
Institute of Applied Electronics, CAEP, Mianyang 621999, China
2.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Received Date: 2018-09-26
Rev Recd Date: 2018-10-17
Publish Date: 2018-11-15

Abstract

Abstract

Electron trajectory center deviation and magnetic field errors of undulator have a great influence on the performances of CTFEL facility, which were limited in the range of specification requirements by preliminary design and post measurement and optimization. In the preliminary design, the global system errors were avoided as far as possible: the magnetic structure has a planar anti-symmetric structure to ensure the coincidence of electron trajectory center and undulator magnetic axis; the special design of magnetic structure end weakens the influence of gap on second integral of magnetic field at undulator exit; the beam and frame of the mechanical system have good rigidity and the control system with close-loop configure guarantees high accuracy of the gap control, all of which limit the magnetic field errors caused by the gap inconsistency. The residual global system errors and local random errors of the magnetic field were reduced in the later measurement and optimization: the longitudinal and transverse distributions of magnetic field were measured using magnetic field measurement bench and then the undulator field was shimmed and optimized by adjusting the positions of standard unit components. Finally, the electron trajectory center deviation, peak-to-peak error, phase error and good field range error meet the requirements of specification after optimization.
- terahertz free electron laser,
- undulator,
- design,
- measurement and optimization

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References(19)

References

[1]	Neil G R, Merminga L. Technical approaches for high-average-power free-electron lasers[J]. Review of Modern Physics, 2002, 74(3): 685-701. doi: 10.1103/RevModPhys.74.685
[2]	Jia Q K. Field integrals error of undulator[J]. Nuclear Instruments & Methods in Physics Research, 1999, 428(2): 589-592.
[3]	Qin B, Tan P, Yang L, et al. Design considerations of a planar undulator applied in a terahertz FEL oscillator[J]. Nuclear Inst and Methods in Physics Research A, 2013, 727(9): 90-96.
[4]	Walker R P. Phase errors and their effect on undulator radiation properties[J]. Physical Review Special Topics-Accelerators and Beams, 2013, 16(1): 122-130.
[5]	Li Y, Faatz B, Pflueger J. Undulator system tolerance analysis for the European X-ray free-electron laser[J]. Review of Modern Physics, 2008, 11(10): 320-325.
[6]	许州, 杨兴繁, 黎明, 等. 高平均功率太赫兹自由电子激光装置设计[J]. 太赫兹科学与电子信息学报, 2013, 11(1): 1-6. https://www.cnki.com.cn/Article/CJFDTOTAL-XXYD201301002.htm Xu Zhou, Yang Xingfan, Li Ming, et al. Design of a high average power terahertz-FEL facility. Journal of Terahertz Science and Electronic Information Technology, 2013, 11(1): 1-6 https://www.cnki.com.cn/Article/CJFDTOTAL-XXYD201301002.htm
[7]	黎明, 杨兴繁, 许州, 等. CAEP太赫兹自由电子激光首次饱和出光[J]. 强激光与粒子束, 2017, 29: 100101. doi: 10.11884/HPLPB201729.170363 Li Ming, Yang Xingfan, Xu Zhou, et al. First lasing of CAEP THz free electron laser. High Power Laser and Particle Beams, 2017, 29: 100101 doi: 10.11884/HPLPB201729.170363
[8]	吴岱, 肖德鑫, 李凯, 等. 砷化镓光阴极直流高压注入器研究进展[J]. 强激光与粒子束, 2015, 27: 045101. doi: 10.11884/HPLPB201527.045101 Wu Dai, Xiao Dexin, Li Kai, et al. Recent progress of GaAs high-voltage DC photo-injector. High Power Laser and Particle Beams, 2015, 27: 045101 doi: 10.11884/HPLPB201527.045101
[9]	王汉斌, 杨兴繁, 潘清, 等. 光阴极直流高压电子枪工程设计[J]. 强激光与粒子束, 2013, 25(s0): 145-148. http://www.hplpb.com.cn/article/id/7812 Wang Hanbin, Yang Xingfan, Pan Qing, et al. Engineering design of photoemission DC high voltage electron gun. High Power Laser and Particle Beams, 2013, 25(s0): 145-148 http://www.hplpb.com.cn/article/id/7812
[10]	Luo X, Lao C, Zhou K, et al. Design and fabrication of the 2×4 -cell superconducting linac module for the free-electron laser[J]. Nuclear Instruments & Methods in Physics Research, 2017, 871: 30-34.
[11]	Vinokurov N. Free electron lasers as a high-power terahertz sources[J]. Journal of Infrared Millimeter & Terahertz Waves, 2011, 32(10): 1123-1143.
[12]	窦玉焕, 束小建, 邓德荣, 等. 中物院高功率THz FEL装置的理论分析和优化设计[J]. 强激光与粒子束, 2013, 25(3): 662-666. doi: 10.3788/HPLPB20132503.0662 Dou Yuhuan, Shu Xiaojian, Deng Derong, et al. Design and simulations of CAEP high power THz FEL. High Power Laser and Particle Beams, 2013, 25(3): 662-666 doi: 10.3788/HPLPB20132503.0662
[13]	Jia Q K. Parameter design considerations for an oscillator IR-FEL[J]. Chinese Physics C, 2017 (1): 187-194.
[14]	Halbach K. Application of permanent magnets in accelerators and electron storage rings[J]. Journal of Applied Physics, 1985, 57(8): 3605-3608. doi: 10.1063/1.335021
[15]	Elleaume P, Onuki A H. Undulators, wigglers and their applications[M]. London: CRC Press, 2002.
[16]	张继东, 周巧根, 张红辉, 等. 可变椭圆极化波荡器EPU10.0的传动控制[J]. 原子能科学技术, 2006, 40(5): 602-604. https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS200605020.htm Zhang Jidong, Zhou Qiaogen, Zhang Honghui et al. Phase driving system for variable elliptically polarized undulator EPU10.0. Atomic Energy Science and Technology, 2006, 40(5): 602-604 https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS200605020.htm
[17]	Tanaka T, Goto S, Hara T, et al. Undulator commissioning by characterization of radiation in X-ray free electron lasers[J]. Review of Modern Physics, 2012, 15(11): 41-73.
[18]	Li P, Wei T, Li Y, et al. Magnetic design of an Apple-X afterburner for the SASE3 undulator of the European XFEL[J]. Nuclear Instruments & Methods in Physics Research, 2017, 870: 103-109.
[19]	Elleaume P, Chavanne J, Faatz B. Design considerations for a 1 Å SASE undulator[J]. Nuclear Instruments & Methods in Physics Research, 2000, 455(3): 503-523.