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Novel LHC collimator materials: High-energy Hadron beam impact tests and nondestructive postirradiation examination
/ Gobbi, Giorgia (CERN) ; Bertarelli, Alessandro (CERN) ; Carra, Federico (CERN) ; Guardia-Valenzuela, Jorge (CERN ; U. Zaragoza (main)) ; Redaelli, Stefano (CERN)
The LHC collimation system must adopt materials with excellent thermal shock resistance, high electrical conductivity, geometrical stability, and radiation hardness. Two novel composites, Molybdenum–Carbide–Graphite and Copper–Diamond, are proposed for the LHC collimation upgrade. [...]
2019 - 14 p.
- Published in : 10.1080/15376494.2018.1518501
Fulltext: PDF;
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Mechanical robustness of HL-LHC collimator designs
/ Carra, Federico (CERN) ; Bertarelli, Alessandro (CERN) ; Gobbi, Giorgia (CERN) ; Guardia-Valenzuela, Jorge (CERN ; U. Zaragoza (main)) ; Guinchard, Michael (CERN) ; Harden, Fiona (CERN) ; Pasquali, Michele (CERN) ; Redaelli, Stefano (CERN) ; Skordis, Eleftherios (CERN)
Two new absorbing materials were developed as collimator inserts to fulfil the requirements of HL-LHC higher brightness beams: molybdenum-carbide graphite (MoGr) and copper-diamond (CuCD). These materials were tested under intense beam impacts at CERN HiRadMat facility in 2015, when full jaw prototypes were irradiated. [...]
CERN-ACC-2019-162.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPTS091
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS091
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Dynamic Response of Advanced Materials Impacted by Particle Beams: The MultiMat Experiment
/ Pasquali, M (CERN) ; Bertarelli, A (CERN) ; Accettura, C (CERN ; Milan Polytechnic) ; Berthome, E (CERN) ; Bianchi, L (CERN) ; Bolz, P (Darmstadt, GSI) ; Carra, F (CERN) ; Fichera, C (BIAM, St Paul lez Durance) ; Frankl, M I (CERN) ; Furness, T (Huddersfield U.) et al.
The introduction at CERN of new extremely energetic particle accelerators, such as the high-luminosity large hadron collider (HL-LHC) or the proposed future circular collider (FCC), will increase the energy stored in the circulating particle beams by almost a factor of two (from 360 to 680 MJ) and of more than 20 (up to 8500 MJ), respectively. In this scenario, it is paramount to assess the dynamic thermomechanical response of materials presently used, or being developed for future use, in beam intercepting devices (such as collimators, targets, dumps, absorbers, spoilers, windows, etc.) exposed to potentially destructive events caused by the impact of energetic particle beams. [...]
publ - 30 p.
- Published in : J. Dynamic Behavior Mater. 5 (2019) 266-295
External link: Fulltext from publisher
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Proton irradiation effects in Molybdenum-Carbide-Graphite composites
/ Simos, N (Brookhaven) ; Charitonidis, N (CERN) ; Simon, P (CERN) ; Whitaker, M (Brookhaven ; YITP, Stony Brook) ; Zhong, H (YITP, Stony Brook) ; Ghose, S (Brookhaven) ; Zhong, Z (Brookhaven) ; Quaranta, E (CERN) ; Guardia-Valenzuela, J (CERN) ; Accettura, C (CERN ; Milan Polytechnic) et al.
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) has prompted the investigation of novel materials for beam-intercepting devices, and in particular for the collimators responsible for protecting the machine from beam losses. The HL-LHC collimation system will inevitably experience increased levels of radiation damage and undergo changes in their crucial physio-mechanical properties. [...]
2021 - 14 p.
- Published in : J. Nucl. Mater. 553 (2021) 153049
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Beam-Impact Validation of HL-LHC Collimator Materials: the "MultiMat-2" Experiment
/ 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) et al.
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. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPM109
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPM109
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Dynamic Testing and Characterization of Advanced Materials in a New Experiment at CERN HiRadMat Facility
/ Bertarelli, Alessandro (CERN) ; Accettura, Carlotta (CERN ; Milan Polytechnic) ; Berthomé, Emmanuel (CERN) ; Bianchi, Laura (CERN) ; Bolz, Philipp (Darmstadt, GSI) ; Carra, Federico (CERN) ; Fichera, Claudio (CERN) ; Frankl, Matthias (CERN) ; Furness, Thomas (Huddersfield U.) ; Gobbi, Giorgia (CERN) et al.
An innovative and comprehensive experiment (named “Multimat”) was successfully carried out at CERN HiRadMat facility on 18 different materials relevant for Collimators and Beam Intercepting Devices. Material samples, tested under high intensity proton pulses of 440 GeV/c, exceeding the energy density expected in HL-LHC, ranged from very light carbon foams to tungsten heavy alloys, including novel composites as graphite/carbides and metal/diamond without and with thin-film coatings. [...]
CERN-ACC-2018-064.-
2018 - 8 p.
- Published in : (2018) , pp. WEPMF071
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 082021
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMF071
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Staged implementation of low-impedance collimation in IR7: plans for LS2
/ Redaelli, Stefano (CERN) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Bertarelli, Alessandro (CERN) ; Bruce, Roderik (CERN) ; Carra, Federico (CERN) ; Gobbi, Giorgia (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN)
The HL-LHC upgrade baseline foresees to replace all secondary collimators of IR7 until LS3 in order to ensure a sufficient margin for beam stability with the high-brightness upgraded beams. [...]
CERN-ACC-NOTE-2019-0001.
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2019. - 30 p.
Full text
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Thermostructural characterization and structural elastic property optimization of novel high luminosity LHC collimation materials at CERN
/ Borg, M (Malta U.) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Gradassi, P (CERN) ; Guardia-Valenzuela, J (CERN) ; Guinchard, M (CERN) ; Arnau Izquierdo, G (CERN) ; Mollicone, P (Malta U.) ; Sacristan-de-Frutos, O (CERN) ; Sammut, N (Malta U.)
The CERN Large Hadron Collider is currently being upgraded to operate at a stored beam energy of 680 MJ through the High Luminosity upgrade. The LHC performance is dependent on the functionality of beam collimation systems, essential for safe beam cleaning and machine protection. [...]
2018 - 15 p.
- Published in : Phys. Rev. Accel. Beams 21 (2018) 031001
Fulltext: PDF;
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Progress with Long-Range Beam-Beam Compensation Studies for High Luminosity LHC
/ Rossi, Adriana (CERN) ; Aberle, Oliver (CERN) ; Albertone, Joel (CERN) ; Barnyakov, Alexey (Novosibirsk, IYF) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Carra, Federico (CERN) ; Cattenoz, Gregory (CERN) ; Delaup, Yorick (CERN) ; Fartoukh, Stephane (CERN) et al.
Long-range beam-beam (LRBB) interactions can be a source of emittance growth and beam losses in the LHC during physics and will become even more relevant with the smaller '* and higher bunch intensities foreseen for the High Luminosity LHC upgrade (HL-LHC), in particular if operated without crab cavities. Both beam losses and emittance growth could be mitigated by compensat-ing the non-linear LRBB kick with a correctly placed current carrying wire. [...]
CERN-ACC-2017-158.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA115
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA115
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