Observation of channeling for 6500 GeV/ c protons in the crystal assisted collimation setup for LHC

Feasibility of measuring the magnetic dipole moments of the charm baryons at the LHC using bent crystals

“…As shown, the experimental setup would consist of using the primary protons in the halo of one of the LHC beams, deflecting them by JHEP08(2017)120 a bent crystal into the target-crystal pack, just upstream of one of the existing detectors of LHC. This experiment is extremely challenging but the recent success of crystal-collimation tests of the UA9 Collaboration [60] may provide the necessary technical know-how for such a complex task. The sensitivity studies presented in this paper show that a precision of ± 0.1 on the g-factor could be reached within data taking time from a few days to about one month.…”

“…In the last decade the UA9 Collaboration has developed the technology and more recently used it to demonstrate that bent silicon crystals can efficiently steer the diffusive halo surrounding the circulating beam in the LHC, up to 6.5 TeV energy [60]. A scenario to deflect the halo particles in the vicinity of an interaction region of LHC is currently under study.…”

Advanced Channeling Technologies in Plasma and Laser Fields

“…During technological test measurements new phenomena for beam deflection have been observed (channeling, volume capture, volume reflection, etc) [39][40][41][42][43][44]. While for a long period the experiments have been dealing with the proton beams of 400 GeV/c at SPS CERN revealing the fine features of proton channeling, like beam mirroring, focusing, collimation, the last measurements were performed for LHC proton beams of 6.5 TeV/c that prove relativistic proton channeling [45]. Channeling-based parasitic beam extraction for high energy particles at present accelerator facilities has been recently proposed within the EU Crysbeam project [46] that aims in developing an alternative technique, which will be able to substitute massive magnetic kickers.…”

Physics opportunities with a fixed target experiment at the LHC (AFTER@LHC)

“…In that case, the beam halo interacts directly with the target. Another more promising solution, that has the advantage to be more parasitic to the main beams, is to deviate the beam halo on an internal solid target by using a bent crystal [17]. In that case, the proton and lead fluxes are expected to be approximately 5.10 8 p/s and 2.10 5 Pb/s and would allow to obtain large luminosities with a target of few millimeter thickness.…”