Evolutionary genetic optimization of the injector beamdynamics for the ERL test facility at IHEP

JIAO Yi

doi:10.1088/1674-1137/38/8/088102

Chinese Physics C> 2014, Vol. 38> Issue(8) : 088102 DOI: 10.1088/1674-1137/38/8/088102

Evolutionary genetic optimization of the injector beamdynamics for the ERL test facility at IHEP

JIAO Yi

Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
The energy recovery linac test facility (ERL-TF), a compact ERL-FEL (free electron laser) two-purpose machine, has been proposed at the Institute of High Energy Physics, Beijing. As one important component of the ERL-TF, the photo-injector was designed and preliminarily optimized. In this paper an evolutionary genetic method, non-dominated sorting genetic algorithm Ⅱ, is applied to optimize the injector beam dynamics, especially in the high-charge operation mode. Study shows that using an incident laser with rms transverse size of 1-1.2 mm, the normalized emittance of the electron beam can be kept below 1 mm·mrad at the end of the injector. This work, together with the previous optimization of the low-charge operation mode by using the iterative scan method, provides guidance and confidence for future construction and commissioning of the ERL-TF injector.

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CHEN Sen-Yu, WANG Shu-Hong, ZHU Xiong-Wei. Chinese Physics C (HEP NP), 2010, 34: 112-114[2] LIU Sheng-Guang, XU Jin-Qiang. Chinese Physics C(HEP NP), 2011, 25(efeq1): 88-91[3] WANG Shu-Hong et al. Chinese Physics C(HEP NP), 2012, 36(5): 469-474[4] CUI Xiao-Hao, JIAO Yi, WANG Jiu-Qing, WANG Shu-Hong. Chinese Physics C(HEP NP), 2013, 37(7): 077005[5] JIAO Yi, XIAO Ou-Zheng. Chinese Physics C, 2014, 38(6): 067003[6] QIANG J, Lidia S, Ryne R D, Limborg-Deprey C. Phys. Rev. ST Accel. Beams, 2006, 9: 044204[7] Bazarov I V, Sinclair C K. Phys. Rev. ST Accel. Beams, 2005, 8: 034202[8] YANG L, Robin D, Sannibale F, Steier C, WAN W. Nucl. Instrum. Methods Phys. Res., Sect. A, 2009, 609: 50-57[9] YANG L, LI Y, GUO W, Krinsky S. Phys. Rev. ST Accel. Beams, 2011, 14: 054001[10] GAO Wei-Wei, WANG Lin, LI Wei-Min. Phys. Rev. ST Accel. Beams, 2011, 14: 094001[11] Deb K et al. IEEE Transactions on Evolutionary Computation, 2002, 6(efeq2): 182-197[12] Bazarov I V et al. J. Appl. Phys., 2008, 103: 054901[13] Dunham B et al. Appl. Phys. Lett., 2013, 102: 034105

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JIAO Yi. Evolutionary genetic optimization of the injector beamdynamics for the ERL test facility at IHEP[J]. Chinese Physics C, 2014, 38(8): 088102. doi: 10.1088/1674-1137/38/8/088102

JIAO Yi. Evolutionary genetic optimization of the injector beamdynamics for the ERL test facility at IHEP[J]. Chinese Physics C, 2014, 38(8): 088102. doi: 10.1088/1674-1137/38/8/088102 shu

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Received: 2013-09-29
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Evolutionary genetic optimization of the injector beamdynamics for the ERL test facility at IHEP

JIAO Yi

Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2013-09-29
Accepted Date: 1900-01-01
Available Online: 2014-08-05

Abstract: The energy recovery linac test facility (ERL-TF), a compact ERL-FEL (free electron laser) two-purpose machine, has been proposed at the Institute of High Energy Physics, Beijing. As one important component of the ERL-TF, the photo-injector was designed and preliminarily optimized. In this paper an evolutionary genetic method, non-dominated sorting genetic algorithm Ⅱ, is applied to optimize the injector beam dynamics, especially in the high-charge operation mode. Study shows that using an incident laser with rms transverse size of 1-1.2 mm, the normalized emittance of the electron beam can be kept below 1 mm·mrad at the end of the injector. This work, together with the previous optimization of the low-charge operation mode by using the iterative scan method, provides guidance and confidence for future construction and commissioning of the ERL-TF injector.