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Title: Feasibility of crystal-assisted collimation in the CERN accelerator complex

Journal Article · · Int.J.Mod.Phys.A
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  1. Imperial Coll., London; INFN, Rome
  2. CERN
  3. Orsay, LAL
  4. CERN; Orsay, LAL
  5. INFN, Ferrara; Ferrara U.
  6. CERN; INFN, Rome
  7. INFN, Rome
  8. INFN, Naples
  9. INFN, Trieste
  10. Insubria U., Como; Milan Bicocca U.
  11. Perugia U.; INFN, Perugia
  12. INFN, Trento; TIFPA-INFN, Trento
  13. Enrico Fermi Ctr., Rome; INFN, Trento
  14. INFN, Legnaro
  15. Frascati
  16. CERN; Frascati
  17. Dubna, JINR
  18. CERN; Dubna, JINR
  19. St. Petersburg, INP
  20. Serpukhov, IHEP
  21. SLAC
  22. Argonne
  23. Fermilab
  24. Imperial Coll., London
+ Show Author Affiliations

Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess the feasibility of crystal-assisted collimation in circular hadron colliders. The adopted layout was exploited and regularly upgraded for about a decade by the UA9 Collaboration. The investigations provided the compelling evidence of a strong reduction of beam losses induced by nuclear inelastic interactions in the aligned crystals in comparison with amorphous orientation. A conceptually similar device, installed in the betatron cleaning insertion of CERN Large Hadron Collider (LHC), was operated through the complete acceleration and storage cycle and demonstrated a large reduction of the background leaking from the collimation region and radiated into the cold sections of the accelerator and the experimental detectors. The implemented layout and the relevant results of the beam tests performed in the SPS and in the LHC with stored proton and ion beams are extensively discussed.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); CERN; Dubna, JINR; Enrico Fermi Ctr., Rome; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Ferrara U.; Frascati; INFN, Ferrara; INFN, Legnaro; INFN, Naples; INFN, Perugia; INFN, Rome; INFN, Trento; INFN, Trieste; Imperial Coll., London; Insubria U., Como; Milan Bicocca U.; Orsay, LAL; Perugia U.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Serpukhov, IHEP; St. Petersburg, INP; TIFPA-INFN, Trento
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1875898
Report Number(s):
FERMILAB-PUB-22-495-AD; oai:inspirehep.net:2097320
Journal Information:
Int.J.Mod.Phys.A, Journal Name: Int.J.Mod.Phys.A Journal Issue: 13 Vol. 37
Country of Publication:
United States
Language:
English

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