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1. Commissioning of the LLRF control system for DC-SRF photo-injector | |||
WANG Fang,FENG Liwen,LIN Lin | |||
Nuclear Science and Technology 17 November 2015 | |||
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Abstract:DC-SRF photo-injector, which can be operated in continuous wave (CW) and pulse mode, was firstly proposed and developed by Peking University. It combines a 1.3 GHz 3+1/2-cell superconducting cavity working at 2 K. Due to the thin walled structure and narrow bandwidth, the superconducting cavity is very susceptible to mechanical perturbations which induces significant amplitude and phase errors and resulting in electron beam quality degradation. In the paper, the parameters of the proportional-integral (PI) controller are optimized in MATLAB and a new controller is presented and simulated in Simulink to deal with the Lorentz force detuning during the filling stage of the cavity in pulse mode. The digital low level radio frequency (LLRF) control system is improved and accomplished based on the new controller, the amplitude and phase stability of the 3+1/2-cell superconducting cavity in pulse mode achieve 0.13% and 0.1 respectively, and it runs stably during the high repetition terahertz radiation experiments based on the DC-SRF photo-injector. | |||
TO cite this article:WANG Fang,FENG Liwen,LIN Lin. Commissioning of the LLRF control system for DC-SRF photo-injector[OL].[17 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661619 |
2. Numerical simulation for space charge dominated beam transport | |||
Lü Jian-Qin | |||
Nuclear Science and Technology 02 February 2009 | |||
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Abstract:To simulate the intense bunched beam transport, a computer program LEADS-3D has been developed. The particle trajectories are analyzed with the Lie algebraic method. Third order approximation of the trajectory solutions is made with space charge forces off, and second order approximation is made with space charge forces on. The particle distribution in the 3-D ellipsoid is uniform or Gaussian. Most of the conventional beam optics elements are incorporated in the code. The optimization procedures are provided to fit the beam lines to satisfy the given optical conditions. | |||
TO cite this article:Lü Jian-Qin. Numerical simulation for space charge dominated beam transport[OL].[ 2 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28359 |
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