Author: Xu, J.Q.
Paper Title Page
PS05
 Photocathode Drive Laser at IHEP  
 
  • J.Q. Xu
    Insititute of High Energy Physics (IHEP), People's Republic of China
  
  Funding: Knowledge Innovation Project supported by IHEP and Project 11275217 supported by NSFC
It is difficult to find commercial laser products meeting the requirements for ERL photocathode drive laser systems. Therefore Experts at Jefferson Lab, Cornell University and KEK have been making effort to optimize laser configurations and improve performances of their laser systems for many years, and made great progress in laser pulse time jitter, pulse extinction ratio, laser output power and fiber amplifiers design, etc. (*,**,***), but macro-pulse gating and beam current ramping are not solved very well yet because of bulk EO crystals**. Recently, IHEP funded a photocathode test facility project. So we can try our best to set up a drive laser system. The drive laser system comprises two kinds of laser seeds, of which one is ps laser at 1.3 GHz rep rate and another fs one at 100 MHz. At the beginning of this year, the two laser seeds were installed. Fiber amplifiers are being constructed in accordance with the design while an aggressive idea expected to improve beam current ramping method is put forward. We will use fast optic modulators and a spectrum handling method to get flexible pulses with high extinction ratio. Some optical components with stringent specifications will be crucial. We will optimize our design and then test it at IHEP later.
* S.Zhang, ERL2009;
** Bruce Dunham, ERL2011;
*** Honda Yosuke, ERL2011. 		 
 
PS06 Progress on the Construction of IHEP 500kV Photocathode DC Gun System 93
 
  • X.P. Li, J.S. Cao, S.Y. Chen, Y.L. Chi, Y. Jiao, J. Liu, R.L. Liu, K. Lv, S. Pei, X.H. Peng, D.R. Sun, G.W. Wang, J.Q. Wang, S.H. Wang, O. Xiao, J.R. Zhang, T. Zhang, Z.S. Zhou
    IHEP, Beijing, People's Republic of China
  • J.Q. Xu
    Insititute of High Energy Physics (IHEP), People's Republic of China
  
  As one of the most important key technologies for future advanced light source based on the Energy Recovering Linac (ERL), a 500kV photocathode DC gun was supported by IHEP in September of 2011. Up to now, schematic design of all DC gun subsystems including drive laser, photocathode preparation system, electron gun body and ceramic insulator, high voltage power supply and beam diagnosis system has been finished. The detailed parameters of each subsystem are presented in this paper.