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2019-07-19
13:59
LHC MD 3165: RF power limitations at flat bottom / Medina Medrano, Luis Eduardo (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Brunner, Olivier (CERN) ; Calaga, Rama (CERN) ; Karpov, Ivan (CERN) ; Chapochnikova, Elena (CERN) ; Peauger, Franck (CERN) ; Timko, Helga (CERN) ; Turaj, Katarzyna (CERN)
This note describes the power measurements at flat bottom with the half-detuning beam-loading scheme in the LHC performed with the aim to provide the basis for the extrapolation of the present RF power margins for Run 3 and the High-Luminosity LHC (HL-LHC). [...]
CERN-ACC-NOTE-2019-0030. - 2019.

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2019-07-16
17:43
Emittance growth in collision with optimised ADT settings (MD3291) / Buffat, Xavier (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Valuch, Daniel (CERN) ; Soderen, Martin (CERN) ; Komppula, Jani Paavo Olavi
A short end of fill experiment, aiming at evaluating the variation of the emittance growth rate on operational beams in collision when reducing the bandwidth of the transverse damper, is described in this note [...]
CERN-ACC-NOTE-2019-0028. - 2019. - 6 p.
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2019-07-16
17:34
Intensity dependance of the train instability threshold and high pile-up test with 12b trains (MD3294) / Buffat, Xavier (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Bartosik, Hannes (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Iadarola, Giovanni (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
As signs of electron cloud driven instabilities at top energy were observed in MDs in 2017 even with short trains(12b), an additional experiment was performed in 2018 to assess the intensity scaling of this instability mechanism using high intensity 12b trains available from the existing injector chain, i.e [...]
CERN-ACC-NOTE-2019-0027. - 2019. - 8 p.
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2019-07-16
16:26
Noise studies with new ADT pickups (MD4143) / Buffat, Xavier (CERN) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Komppula, Jani Paavo Olavi ; Kotzian, Gerd (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) et al.
An experiment aiming at characterizing the performance of a new engineering prototype for the ADT pickup readout electronics with a low noise floor from the point of view of beam stability and emittance growth in collision is described in this note [...]
CERN-ACC-NOTE-2019-0026. - 2019. - 12 p.
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2019-06-24
11:13
Assessment of the Mechanical Properties of Ultra-High Purity Niobium after Cold Work and Heat Treatment with the HL-LHC Crab Cavities as Benchmark / Gallifa Terricabras, Adria (Universidad de Oviedo (ES)) ; Amorim Carvalho, Alexandre (CERN) ; Aviles Santillana, Ignacio (CERN) ; Barriere, Simon (CERN) ; Calaga, Rama (CERN) ; Cano Pleite, Eduardo (CERN) ; Capatina, Ofelia (CERN) ; Crouvizier, Mickael Denis (CERN) ; Dassa, Luca (CERN) ; Meyer, Mickael Sebastien (CERN) et al.
The High Luminosity Large Hadron Collider (HL-LHC) is the upgrade of the world’s largest particle collider; it will allow the full exploitation of the LHC potential and its operation beyond 2025. [...]
CERN-ACC-2019-0050. - 2019. - 7 p.
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2019-06-17
15:43
Crystal Collimation Tests with Pb Ion Beams / D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Fomin, Alex (NSC Kharkiv Institute of Physics and Technology (UA)) ; Belli, Eleonora (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) et al.
During MD4168, performed on November 27th 2018, silicon crystals for a crystal-assisted collimation system were tested. [...]
CERN-ACC-NOTE-2019-0024. - 2019.
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2019-06-17
15:38
Operational Aspects of Crystal Collimation with Proton Beams / D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) ; Galluccio, Francesca (Universita e sezione INFN di Napoli (IT)) ; Serrano Galvez, Pablo (Universidad de Oviedo (ES)) et al.
During MD4167, performed on September 12th 2018, silicon crystals for a crystal-assisted collimation system were tested, with particular focus on operational aspects such as evaluation of cleaning performances and deployment during dynamical phases of the machine. [...]
CERN-ACC-NOTE-2019-0023. - 2019.
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2019-06-17
15:34
Crystal Collimation Tests with Proton Beams / D'Andrea, Marco (Universita e INFN, Padova (IT)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Nevay, Laurence James (University of London (GB)) ; Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Scandale, Walter (CERN) ; Montesano, Simone (Universita e INFN, Bologna (IT)) ; Galluccio, Francesca (Universita e sezione INFN di Napoli (IT)) ; Serrano Galvez, Pablo (Universidad de Oviedo (ES)) et al.
During MD3327, performed in two steps on June 14th and July 27th 2018, silicon crystals for a crystal-assisted collimation system were tested, with particular focus on the newly installed crystal on the horizontal plane of Beam 2. [...]
CERN-ACC-NOTE-2019-0022. - 2019.
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2019-06-11
16:46
LHC MDs 3163, 3164, and 3166: Injection oscillations throughout the cycle / Timko, Helga (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Calaga, Rama (CERN) ; Karpov, Ivan (CERN) ; Medina Medrano, Luis Eduardo (CERN) ; Peauger, Franck (CERN) ; Shaposhnikova, Elena (CERN) ; Turaj, Katarzyna (CERN)
This note summarizes three inter-related machine development sessions that were performed in the LHC in the course of 2018. [...]
CERN-ACC-NOTE-2019-0021. - 2019.
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2019-06-03
14:15
Novel beam-based correction and stabilisation methods for particle accelerators / Malina, Lukas
Precise control of beam optics and beam stability is of critical importance for machine protection and performance of today's high-energy particle accelerators [...]
CERN-THESIS-2018-426 ISSN1501-7710/No.2041. - Oslo, Norway : University of Oslo, 2018-10-24. - 134 p.

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