Author: Huang, N.
Paper Title Page
TUPWO022 Space Charge Effects Study and Optimization in CSNS/LRBT 1928
 
  • Z.P. Li, N. Huang, W.B. Liu, S. Wang
    IHEP, Beijing, People's Republic of China
  
  The linac to ring beam trans­port line (LRBT) of China Spal­la­tion Neu­tron Source (CSNS) con­nect­ing the linac and the rapid cy­cling syn­chro­tron (RCS) trans­ports 80 MeV neg­a­tive hy­dro­gen ions (H−) beams for RCS in­jec­tion. Space charge ef­fect in LRBT is sig­nif­i­cant due to small emit­tance and high cur­rent den­sity of the beam, which is a major cause of emit­tance growth and beam loss. An achro­matic trans­verse op­ti­cal match­ing was per­formed by TRACE 3D code. Emit­tance growths of beams with dif­fer­ent ini­tial dis­tri­b­u­tions in dif­fer­ent LRBT lat­tices were stud­ied sep­a­rately. Sim­u­la­tion re­sults show that the LRBT de­sign with triplet can mit­i­gate the emit­tance growth by lat­tice op­ti­miza­tion of the front match­ing sec­tion and no beam loss oc­curs at 15mA. The lo­ca­tion and pa­ra­me­ters of the de­buncher in LRBT were also op­ti­mized to re­duce the mo­men­tum spread and en­ergy jit­ter.