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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 algorithmⅡ,is applied to optimize the injector beam dynamics,especially in the highcharge 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.
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 algorithmⅡ, is applied to optimize the injector beam dynamics, especially in the highcharge 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.