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VACUUM ›› 2022, Vol. 59 ›› Issue (4): 22-27.doi: 10.13385/j.cnki.vacuum.2022.04.05

• Vacuum Acquisition System • Previous Articles     Next Articles

Vacuum System for CSNS II Ion Source and LEBT

LIU Shun-ming1,2, SONG Hong1,2, WANG Peng-cheng1,2, LIU Jia-ming1,2, GUAN Yu-hui1,2, TAN Biao1,2, SUN Xiao-yang1,2, CHEN Wei-dong1,2, LIU Sheng-jin1,2, OUYANG Hua-fu1,2   

  1. 1. Spallation Neutron Source Science Center, Dongguan 523808, China;
    2. Institute of High Energy Physics, Chinese Academy of Sciences（CAS）, Beijing 100049, China
  • Received:2021-12-27 Online:2022-07-25 Published:2022-08-09

Abstract: The beam power of the CSNS II accelerator will be upgraded from 100kW to 500kW, which requires the average beam power of the linear accelerator to be increased from the current 5kW to 25kW, and the pulse beam intensity to be increased from 12.5mA to more than 40mA. For this reason, the Penning type surface negative hydrogen ion source currently in use will be replaced by a radio frequency（RF） negative hydrogen ion source. Considering that the beam cutting ratio of the beam chopper ranges from 35% to 50%, and the LEBT transmission rate can reach 75% to 95%, the RF negative hydrogen ion source needs to produce a negative hydrogen ion beam of at least 50mA. Therefore, the hydrogen gas consumption of the ion source needs to be increased from the current 10sccm to more than 20sccm,and the pressure of LEBT second chamber is required to be ≤5.0×10-3Pa. Based on this, the ion source and the LEBT vacuum system are modified in this paper,and the beam transmission rate of LEBT is improved. In addition, the pumping speed of hydrogen with two domestic and imported magnetic levitation molecular pumps is compared,which provides a certain reference for the selection of molecular pumps and localized substitution.

Key words: RF-driven H- ion source, LEBT vacuum system, modification of turbo molecular pumping system, hydrogen pumping speed

CLC Number: 

  • TB75
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