CERN Accelerating science

Article
Title	DC-SC Photoinjector with Low Emittance at Peking University
Author(s)	Xiang Rong ; Ding, Yuantao ; Hao, J ; Huang, Senlin ; Lu Xiang Yang ; Quan, Shengwen ; Zhang, Baocheng ; Zhao, Kui
Affiliation	(PKU/IHIP, Beijing)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3325
Subject category	Accelerators and Storage Rings
Abstract	High average power Free Electron Lasers require the high quality electron beams with the low emittance and the sub-picosecond bunches. The design of DC-SC photoinjector, directly combining a DC photoinjector with an SRF cavity, can produce high average current beam with moderate bunch charge and high duty factor. Because of the DC gun, the emittance increases quickly at the beginning, so a carefully design is needed to control that. In this paper, the simulation of an upgraded design has been done to lower the normalized emittance below 1.5mm·mrad. The photoinjector consists of a DC gap and a 2+1/2-cell SRF cavity, and it is designed to produce 4.2 MeV electron beams at 100pC bunch charge and 81.25MHz repetition rate (8 mA average current).