Author: Shetty, N.V.
Paper Title Page
TUPFI027 Energy Deposition Studies for Fast Losses during LHC Injection Failures 1397
 
  • A. Lechner, A. Alnuaimi, C. Bracco, F. Cerutti, A. Christov, L.S. Esposito, N.V. Shetty, V. Vlachoudis
    CERN, Geneva, Switzerland
  
  Sev­eral in­stances of in­jec­tion kicker mag­net (MKI) fail­ures have oc­curred in the first years of LHC op­er­a­tion, lead­ing to mis­in­jec­tions or to ac­ci­den­tal kicks of cir­cu­lat­ing bunches. In a few cases, MKI mod­ules im­parted a par­tial or an in­creased beam de­flec­tion, re­sult­ing in graz­ing bunch im­pact on beam-in­ter­cept­ing de­vices and con­se­quently lead­ing to sig­nif­i­cant sec­ondary show­ers to down­stream ac­cel­er­a­tor el­e­ments. In this study, we in­ves­ti­gate dif­fer­ent fail­ure oc­cur­rences where mis­kicked bunches were in­ci­dent on the in­jec­tion beam stop­per (TDI) and on one of the aux­il­iary in­jec­tion col­li­ma­tors (TCLIB), re­spec­tively. FLUKA shower cal­cu­la­tions were per­formed to quan­tify the en­ergy de­po­si­tion in su­per­con­duct­ing mag­nets. Dif­fer­ent sec­tions of the LHC in­ser­tion re­gions 2 and 8 were stud­ied, in­clud­ing the sep­a­ra­tion di­pole and the inner triplet down­stream of the TDI as well as match­ing sec­tion and dis­per­sion sup­pres­sor ad­ja­cent to the TCLIB. The ob­tained re­sults are eval­u­ated in view of quench and dam­age lim­its.