Ultra-High Vacuum characterization of Molybdenum-Carbide Graphite for HL-LHC collimators

Accettura, Carlotta; Beghi, M.; Bertarelli, A.; Bregliozzi, Giuseppe; Carra, Federico; Cattenoz, G.; Guardia-Valenzuela, J.; Redaelli, Stefano; Taborelli, M.

doi:10.1088/1742-6596/1350/1/012085

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…x Additional materials of interest for high-end applications: Carbon-Fibre-Carbon (CFC), denser MoGr, Chromium-Graphite (CrGr) [13][14]. In this paper we focus on HL LHC solutions or alternatives [7]: Mo coated MoGr, Cu-coated graphite and CuCD. Inermet 180, the material choice for several HL-LHC collimators (TCLPX, TCTPXH, TCTPXV, TCLP, TCTPM), has been extensively tested in past HiRadMat experiences [15][16][4] and was thus not re-evaluated in MultiMat-2, as it was found to explode under absorbed energies one order of magnitude lower than the HL-LHC design case [17].…”

Section: Methodsmentioning

confidence: 99%

“…After MultiMat, the manufacturing of such materials and coatings was outsourced to industry, for production during LS2. Moreover, in recent years, new material solutions have been proposed for the LS3 collimators [7]. A second experiment, named MultiMat-2, was devised and completed in 2021, to validate the industrial grades developed for LS2 collimators, as well as new solutions proposed for the LS3 production.…”

Section: Introductionmentioning

confidence: 99%

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Beam-Impact Validation of HL-LHC Collimator Materials: The “MultiMat-2” Experiment

Carra,

Accettura,

Bertarelli

et al. 2024

J. Phys.: Conf. Ser.

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In 2017, a proton-impact test on HL-LHC collimator materials was carried out in the HiRadMat facility at CERN. The experiment, called “MultiMat”, enabled the testing of uncoated and coated material composites and alloys, in most of the cases developed at CERN, for different beam collimation functionalities. Manufacturing of these materials was then passed to 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 the same experimental test bench as for “MultiMat”. This new experiment demonstrated 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 setup and the main results of the experiment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beam-Impact Validation of HL-LHC Collimator Materials: The “MultiMat-2” Experiment

Carra,

Accettura,

Bertarelli

et al. 2024

J. Phys.: Conf. Ser.

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“…The fibres are bonded by a graphitic matrix, highly graphitized at 2800 • 𝐶, leading to a final density of 1.85 g/cm 3 . The result is a 2D-orthotropic material, with a virtually isotropic behaviour in the fibre plane [24,25]. Also in the upper jaw, a SiC-SiC block, produced by the Organization of Advanced Sustainability Initiative for Energy System/Materials (OASIS) in Muroran institute of Technology [26], was placed downstream of the CfC blocks.…”

Section: Target Materials and Preparationmentioning

confidence: 99%

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

Maestre¹,

Bahamonde²,

Garcia³

et al. 2022

J. Inst.

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Beam Intercepting Devices (BIDs) are essential protection elements for the operation of the Large Hadron Collider (LHC) complex. The LHC internal beam dump (LHC Target Dump Injection or LHC TDI) is the main protection BID of the LHC injection system; its main function is to protect LHC equipment in the event of a malfunction of the injection kicker magnets during beam transfer from the SPS to the LHC. Several issues with the TDI were encountered during LHC operation, most of them due to outgassing from its core components induced by electron cloud effects, which led to limitations of the injector intensity and hence had an impact on LHC availability. The absorbing cores of the TDIs, and of beam intercepting devices in general, need to deal with high thermo-mechanical loads induced by the high intensity particle beams. In addition, devices such as the TDI — where the absorbing materials are installed close to the beam, are important contributors to the accelerator impedance budget. To reduce impedance, the absorbing materials that make up the core must be typically coated with high electrical conductivity metals. Beam impact testing of the coated absorbers is a crucial element of development work to ensure their correct operation. In the work covered by this paper, the behaviour of several metal-coated absorber materials was investigated when exposed to high intensity and high energy proton beams in the HiRadMat facility at CERN. Different coating configurations based on copper and molybdenum, and absorbing materials such as isostatic graphite, Carbon Fibre Composite (CfC) and Silicon Carbide reinforced with Silicon Carbide fibres (SiC-SiC), were tested in the facility to assess the TDI's performance and to extract information for other BIDs using these materials. In addition to beam impact tests and an extensive Post Irradiation Examination (PIE) campaign to assess the performance of the coatings and the structural integrity of the substrates, extensive numerical simulations were carried out.

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Section: Target Materials and Preparationmentioning

confidence: 99%

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

Maestre,

Bahamonde,

Garcia

et al. 2021

Preprint

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Ultra-High Vacuum characterization of Molybdenum-Carbide Graphite for HL-LHC collimators

Cited by 6 publications

References 3 publications

Beam-Impact Validation of HL-LHC Collimator Materials: The “MultiMat-2” Experiment

Beam-Impact Validation of HL-LHC Collimator Materials: The “MultiMat-2” Experiment

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

High intensity proton beam impact at 440 GeV/c on Mo and Cu coated CfC/graphite and SiC/SiC absorbers for beam intercepting devices

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