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

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

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

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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