CERN Accelerating science

Article
Title	Beam-Impact Validation of HL-LHC Collimator Materials: the "MultiMat-2" Experiment
Author(s)	Carra, F (CERN) ; Accettura, C (CERN) ; Bertarelli, A (CERN) ; Berthomé, E (CERN) ; Bruce, R (CERN) ; Charitonidis, N (CERN) ; Dalemir, M (CERN) ; Farina, E (CERN) ; Guardia-Valenzuela, J (CERN) ; Guinchard, M (CERN) ; Lechner, A (CERN) ; Nuiry, F -X (CERN) ; Perillo-Marcone, A (CERN) ; Pfeiffer, S (CERN) ; Glaude, D (CERN) ; Rigutto, E (CERN) ; de Frutos, O Sacristan (CERN) ; Simon, P (CERN) ; Redaelli, S (CERN) ; Perez-Fontenla, A T (CERN) ; Vollenberg, W
Publication	2023
Number of pages	4
In:	JACoW IPAC 2023 (2023) WEPM109
In:	14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPM109
DOI	10.18429/JACoW-IPAC2023-WEPM109
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC
Project	CERN HL-LHC
Abstract	In 2017, a proton-impact test HL-LHC collimator materials was carried out in the HiRadMat facility at CERN. The experiment, called “MultiMat”, enabled the testing of bulk and coated materials developed at CERN for different beam collimation functionalities. Manufacturing of these materials was then passed to the industry, leading to a series production for use in the collimators installed in the LHC during Long Shutdown 2 (LS2). The industrial versions of bulk and coating materials were tested in HiRadMat in 2021 in the “MultiMat-2” experiment, that efficiently re-used of the same experimental test bench as for “MultiMat”. This new experiment proved the reliability of the absorbers installed in LS2, and confirmed the possible use of alternative materials and coatings for the next LS3 collimator production. This paper describes the preparation and beam parameters of “MultiMat-2”, the experimental and data-acquisition equipment and the main results of the experiment.
Copyright/License	CC-BY-4.0

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