Reference: G. Azzopardi, et. al., "LHC Collimation Controls System for Run III Operation",
in ICALEPCS'21, Shanghai, China, paper THPV012, 2021.
Crystal collimators
Description
Crystal collimation of ion beam cleaning at the LHC has been part of the R&D program of the HL-LHC-WP5, following the encouraging results of the UA9 collaboration at the SPS. Following the HL-LHC Cost & Schedule review 2019, crystal collimation was integrated in the HL-LHC upgrade baseline as a mitigation measure for schedule risks associated with the 11T dipole program.Following the decision at HL-TCC in Nov. 2020 not to install the 11T dipoles during LS2, crystal collimation is not the baseline solution to improve ion collimation cleaning during Run 3.
It is planned to upgrade the crystal collimation test stand in IR7 in two phases:
- The vertical TCPCs are being built at CERN and they are planned to be replaced at the end of 2021.
- The horizontal TCPCs will be replaced at the following YETS 2022-23.
Pictures
(Courtesy of R. Seidenbinder)
References
- S. Redaelli at the LMC panel: Collimation scenarios depending on 11T dipoles installation during LS2, 8 Jul. 2020 (indico link).
- S. Redaelli at the LMC panel: AOB: Update on the crystal collimation plans, 3 Feb. 2021 (indico link).
- M. Di Castro at the LMC panel: Operational Status of the LHC Crystal Goniometers and Foreseen Upgrade, 17 Mar. 2021 (indico link).
- EDMS No. 1973244, Upgrade Of The Crystal Collimation Test Stand in IR7.