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2 results on '"Levens, Thomas"'

1. First results of the compensation of the beam-beam effect with DC wires in the LHC

Author

Sterbini, Guido, Amorim, David, Bartosik, Hannes, Bertarelli, Alessandro, Bruce, Roderik, Buffat, Xavier, Carra, Federico, Carver, Lee, Cattenoz, Gregory, Effinger, Ewald, Fartoukh, Stephane, Fitterer, Miriam, Fuster-Martínez, Nuria, Gąsior, Marek, Gonzalez-Berges, Manuel, Gorzawski, Arkadiusz, Hemelsoet, Georges-Henry, Hostettler, Michael, Iadarola, Giovanni, Jones, Owain Rhodri, Kaltchev, Dobrin, Karastathis, Nikolaos, Kostoglou, Sofia, Lamas Garcia, Inigo, Levens, Thomas, Levichev, Alexey, Medina Medrano, Luis, Mirarchi, Daniele, Olexa, Jakub, Papadopoulou, Stefania, Papaphilippou, Yannis, Pellegrini, Dario, Pojer, Mirko, Ponce, Laurette, Poyet, Axel, Redaelli, Stefano, Rossi, Adriana, Salvachua, Belen, Schmickler, Hermann, Schmidt, Frank, Skoufaris, Kyriacos, Solfaroli, Matteo, Tomás, Rogelio, Trad, Georges, Valishev, Alexander, Valuch, Daniel, Xu, Chen, Zamantzas, Christos, Zisopoulos, Panagiotis, Institut National Polytechnique de Grenoble (INPG), and Université Grenoble Alpes (UGA)

Subjects
experiment, MC1: Circular and Linear Colliders, Physics::Instrumentation and Detectors, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], wire, simulation, beam-beam-effects, Accelerators and Storage Rings, Accelerator Physics, operation, experimental equipment, CERN LHC Coll: upgrade, scattering: beam-beam, collider, performance
Abstract

The compensation of the long-range beam-beam interactions using DC wires is presently under study as an option for enhancing the machine performance in the frame of the High-Luminosity LHC project (HL-LHC). The original idea dates back more than 15 years. After the installation of four wire prototypes in the LHC in 2018, a successful experimental campaign was performed during the last months. The experimental setup and the main results are reported in this paper., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia

Published
2019
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2. Observations, Analysis and Mitigation of Recurrent LHC Beam Dumps Caused by Fast Losses in Arc Half-Cell 16L2

Author

Jimenez, José, Amorim, David, Antipov, Sergey, Arduini, Gianluigi, Bertarelli, Alessandro, Biancacci, Nicolo, Bradu, Benjamin, Bravin, Enrico, Bregliozzi, Giuseppe, Brodzinski, Krzysztof, Bruce, Roderik, Buffat, Xavier, Carver, Lee, Chiggiato, Paolo, Claudet, Serge, Collier, Paul, Garcia Alia, Ruben, Giovannozzi, Massimo, Gorzawski, Arkadiusz, Grob, Laura, Holzer, Eva Barbara, Höfle, Wolfgang, Iadarola, Giovanni, Kotzian, Gerd, Lechner, Anton, Levens, Thomas, Lindstrom, Bjorn, Medvedeva, Tatiana, Mether, Lotta, Milanese, Attilio, Mirarchi, Daniele, Métral, Elias, Perini, Diego, Redaelli, Stefano, Rumolo, Giovanni, Salvant, Benoit, Schmidt, Ruediger, Valette, Matthieu, Valuch, Daniel, Wenninger, Jorg, Wollmann, Daniel, Yin Vallgren, Christina, Zamantzas, Christos, Zerlauth, Markus, and Université Grenoble Alpes (UGA)

Subjects
solenoid, electron, beam dynamics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, beam loss, MMI, beam instability, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], collimator, vacuum, Accelerators and Storage Rings, 01 natural sciences, 01 Circular and Linear Colliders, Accelerator Physics, operation, CERN LHC Coll, 0103 physical sciences, A01 Hadron Colliders, beam dump, Physics::Accelerator Physics, performance, activity report
Abstract

Recurrent beam dumps significantly perturbed the operation of the CERN LHC in the summer months of 2017, especially in August. These unexpected beam dumps were triggered by fast beam losses that built up in the cryogenic beam vacuum at the half-cell 16 left of LHC-IP2 and were detected either at that location but mainly in the collimation insertions. This contribution details the experimental observables (beam losses, coherent instabilities, heat load to cryogenic system, vacuum signals), the extent of the understanding of the beam loss and instability mechanisms and the mitigation steps and new settings that allowed recovering the luminosity performance of the LHC for the rest of the Run., Proceedings of the 9th Int. Particle Accelerator Conf., IPAC2018, Vancouver, BC, Canada

Published
2018
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