Author: Yang, J.C.
Paper Title Page
THPS044 Study of Charge Exchange Injection in HITFiL 3520
 
  • W.P. Chai, J. Shi, J.W. Xia, J.C. Yang
    IMP, Lanzhou, People's Republic of China
  
  A new ac­cel­er­a­tor com­plex ded­i­cat­ed to hadron can­cer ther­a­py, Heavy-Ion Ther­a­py Fa­cil­i­ty in Lanzhou (HIT­FiL), is pro­posed and de­signed. Based on the op­er­at­ing ex­pe­ri­ence and ex­ist­ing tech­nol­o­gy on HIR­FL-CSR, a heavy-ion cy­clotron is used as an in­jec­tor in­stead of a linac. A heavy-ion syn­chrotron as main com­po­nent is de­signed with spe­cial at­ten­tion paid to com­pact struc­ture, high re­li­a­bil­i­ty and low cost. HIT­FiL is de­signed to ac­com­mo­date both pro­ton and car­bon-ion using the same in­ject­ing chan­nel but dif­fer­ent in­ject­ing points. Charge ex­change in­jec­tion scheme, which is more ef­fi­cient com­pared with sin­gle-turn in­jec­tion but less cost­ly com­pared with mul­ti­ple mul­ti-turn in­jec­tion aided by elec­tron-cool­ing, is adopt­ed. H2+ or C5+ beams, pre-ac­cel­er­at­ed by the cy­clotron, are stripped into H+ or C6+ by a car­bon foil at in­jec­tion point, then in­ject­ed and merged into syn­chrotron coast­ing orbit. The de­sign of the in­jec­tion sys­tem is pre­sent­ed in this paper. The whole in­jec­tion pro­cess is sim­u­lat­ed, op­ti­miza­tion of pa­ram­e­ters on in­ject­ing ef­fi­cien­cy, paint­ing scheme and emit­tance growth are per­formed. The re­sult­ing beam dis­tri­bu­tion in phase space after in­jec­tion is achieved.