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Thermo-Mechanical FE Simulation & Characterization of MoGr’s Elastic Properties / de Bras de Fer, Thibault (CERN)
This report summarizes a two-month’s internship within the EN-MME department, focusing on Finite Element simulations for the Collimation project and PSB H0/H- dump upgrade, and the progress done on the characterization of Molybdenum-Graphite elastic properties..
CERN-STUDENTS-Note-2014-134. - 2014
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Ultra-high vacuum characterization of molybdenum-carbide graphite for HL-LHC collimators / Accettura, Carlotta (CERN ; Milan, Polytech.) ; Beghi, Marco (Milan, Polytech.) ; Bertarelli, Alessandro (CERN) ; Bregliozzi, Giuseppe (CERN) ; Cattenoz, Gregory (CERN) ; Guardia Valenzuela, Jorge (U. Zaragoza (main) ; CERN) ; Redaelli, Stefano (CERN) ; Taborelli, Mauro (CERN) ; Carra, Federico (CERN)
In view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) collimation system, a family of novel molybdenum-carbide graphite (MoGr) composites was developed to meet the challenging requirements of HL-LHC beam-halo collimation, in particular the electrical conductivity and thermo-mechanical performances. The Ultra-High Vacuum (UHV) behaviour of this material was extensively characterized to assess its compatibility with the accelerator’s specifications. [...]
CERN-ACC-2019-160.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS093 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS093

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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. - 2019. - 30 p.
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Internal H0/H- Dump for the Proton Synchrotron Booster Injection at CERN / Delonca, M (CERN) ; Maglioni, C (CERN) ; Patapenka, A (CERN) ; Sarrio Martinez, A (CERN)
In the frame of the LHC Injectors Upgrade Project at CERN (LIU), the new 160MeV H- Linac4 will inject into the four existing PS Booster rings after the conversion of H- into H+ in a stripping foil. Given a limited stripping efficiency and possible foil failures, a certain percentage of the beam is foreseen to remain partially (H0) or completely (H-) unstripped. [...]
CERN-ATS-2012-263.- Geneva : CERN, 2012 - 4 p. - Published in : Conf. Proc.: C1205201 (2012) , pp. TUPPR054
Fulltext: PDF; External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.1942

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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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Resistivity Characterization of Molybdenum-Coated Graphite-Based Substrates for High-Luminosity LHC Collimators / Accettura, Carlotta (Politecnico di Milano (IT)) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Baris, Adrienn (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Calatroni, Sergio (CERN) ; Carra, Federico (CERN) ; Caspers, Fritz (European Scientific Institute (FR)) ; Garcia-Tabares Valdivieso, Elisa (CERN) et al.
The High-Luminosity Large Hadron Collider (HL-LHC) project aims at extending the operability of the LHC by another decade and increasing by more than a factor of ten the integrated luminosity that the LHC will have collected by the end of Run 3. This will require doubling the beam intensity and reducing the transverse beam size compared to those of the LHC design. [...]
CERN-ACC-NOTE-2020-0025.- Geneva : CERN, 2020 - Published in : Coatings 10 (2020) 361 Fulltext: PDF;

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Report on modelling and materials / EuCARD, Collaboration (EuCARD)
WP: 8: Collimators & materials for higher beam power beam
Task: 8.2: Modeling & Material Tests for Hadron Beams

The WP8 aims at the design of advanced materials and collimators to allow for higher beam power in state-of-the-art accelerator facilities. [...]
EuCARD-REP-2014-006. - 2014.
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Single-Collimator Tune Shift Measurement of the Three-Stripe Collimator at the LHC / Antipov, Sergey (CERN) ; Amorim, David (U. Grenoble Alpes) ; Biancacci, Nicolo (CERN) ; Carver, Lee (CERN) ; Mazzacano, Giacomo (U. Rome La Sapienza (main)) ; Mereghetti, Alessio (CERN) ; Métral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Valuch, Daniel (CERN)
Several options of low resistivity coating have been proposed for the collimator upgrade of the Large Hadron Collider. In order to study their effect on the beam dynamics a special collimator has been built and installed in the machine. [...]
CERN-ACC-2018-148.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF035 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF035

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Transverse Beam Stability with Low-Impedance Collimators in the High Luminosity Large Hadron Collider: Status and Challenges / Antipov, S.A. (CERN) ; Amorim, D. (CERN) ; Biancacci, N. (CERN) ; Carideo, E. (CERN) ; Mereghetti, A. (CERN) ; Métral, E. (CERN) ; Redaelli, S. (CERN) ; Salvant, B. (CERN) ; Valuch, D. (CERN)
The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) will double its beam intensity for the needs of High Energy Physics frontier. In order to ensure coherent stability until the beams are put in collision, the transverse impedance has to be reduced [...]
arXiv:1910.09974.- 2020-03-30 - 13 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 034403 Fulltext: PDF; Fulltext from Publisher: PDF;

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