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2019-12-13
09:44
Experimental Validation of Superconducting Model Circuits for High-Luminosity Project at CERN: Flux Jumps and Magnet Transfer Functions / Ierardi, Stefano (Universita e sezione INFN di Napoli (IT))
The Nb3Sn superconducting MQXF quadrupole and the 11-T dipole magnets represent a new technology enabler for future high-energy particle accelerators: the former aims at reducing the beam size by a factor two and increasing the rate of collisions by a factor of five; the latter, instead, will be able to provide the same integrated field as the standard 8.3 T LHC dipole, but in a shorter length, thus freeing up space for additional collimators for reducing the beam losses produced by the higher intensity beams of the HL-LHC. A possible impediment comes from flux jumps that, so far, could not be avoided by design. [...]
CERN-THESIS-2019-242.- 125 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-12-11
13:42
SPS Beam Dump Facility - Comprehensive Design Study / Ahdida, Claudia Christina (CERN) ; Arduini, Gianluigi (CERN) ; Battistin, Michele (CERN) ; Brugger, Markus (CERN) ; Calviani, Marco (CERN) ; Goddard, Brennan (CERN) ; Jacobsson, Richard (CERN) ; Lamont, Mike (CERN) ; Bauche, Jeremie (CERN) ; Casolino, Mirkoantonio (The Barcelona Institute of Science and Technology (BIST) (ES)) et al.
The proposed Beam Dump Facility (BDF) is foreseen to be located at the North Area of the SPS. It is designed to be able to serve both beam dump like and fixed target experiments. [...]
CERN-PBC-REPORT-2019-005.- Geneva : CERN, 2019 - 589. SPS Beam Dump Facility - Comprehensive Design Study: PDF;

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2019-12-09
11:43
Behaviour of copper during initial conditioning in the pulse DC system / Profatilova, Iaroslava (CERN) ; Wuensch, Walter (CERN) ; Calatroni, Sergio (CERN)
Conditioning is a process that is used to improve the quality of RF accelerating structures before starting operation at full field and power. [...]
CERN-ACC-2019-0058 ; CLIC-Note-1145. - 2019. - 10 p.
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2019-12-06
17:22
MD4147: 50 Hz harmonics perturbation / Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Arduini, Gianluigi (CERN) ; Baccigalupi, Carlo ; Bartosik, Hannes (CERN) ; Buffat, Xavier (CERN) ; Burnet, Jean-Paul (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Cerqueira Bastos, Miguel (CERN) ; De Maria, Riccardo (CERN) ; Fartoukh, Stephane (CERN) et al.
Since the beginning of the LHC commissioning, harmonics of 50 Hz have been observed in the beam spectrum. [...]
CERN-ACC-NOTE-2019-0055. - 2019. - 21 p.
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2019-12-06
11:29
BE Department Annual Report 2018 / Collier, Paul (CERN) ; Arduini, Gianluigi (CERN) ; Billen, Ronny (CERN) ; Hatziangeli, Eugenia (CERN) ; Jensen, Erk (CERN) ; Jones, Rhodri (CERN) ; Laderi, Efthymia (CERN) ; Lamont, Mike (CERN) ; Mackney, Anna (CERN) ; Sollander, Peter (CERN) et al.
The Beams Department hosts the Groups responsible for the beam generation, acceleration, diagnostics, controls and performance optimization for the whole CERN accelerator complex. [...]
CERN-ACC-2019-0057. - 2019. - 96 p.
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2019-12-06
04:06
Setup and Characteristics of a Timing Reference Signal with sub-ps Accuracy for AWAKE / Batsch, Fabian
We describe a method to overcome the triggering jitter of a streak camera to obtain less noisy images of a self-modulated proton bunch over long time scales ($\sim$ 400 ps to ns) with the time resolution ($\sim$ 1 ps) of the short time scale images (73 ps). [...]
arXiv:1911.12201. - 6 p.
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2019-12-05
17:28
LHC MD4243: Q22 optics in TI2 / Velotti, Francesco Maria (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Goddard, Brennan (CERN) ; Hessler, Christoph ; Kain, Verena (CERN) ; Chapochnikova, Elena (CERN) ; Timko, Helga (CERN)
This MD shows the feasibility of operating TI2 with an optics matched to the SPS Q22 optics.Optics studies in the transfer line (TL) were performed together with an injection voltage scan toassess, also, the longitudinal quality of the injected single bunch..
CERN-ACC-NOTE-2019-0054. - 2019. - 5 p.
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2019-12-05
11:58
MD3263: Beam-Beam Long-Range Compensation using DC Wires in the LHC / Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Fartoukh, Stephane (CERN) ; Fuster Martinez, Nuria (CERN) ; Karastathis, Nikos (CERN) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Redaelli, Stefano (CERN) ; Rossi, Adriana (CERN) ; Skoufaris, Kyriacos (University of Crete (GR)) ; Solfaroli Camillocci, Matteo (CERN) et al.
This note summarizes the experimental results obtained during the 2018 LHC Machine Development program during the measurements campaign of the Beam-Beam Long-Range compensation using DC wires (MD3263). [...]
CERN-ACC-NOTE-2019-0053. - 2019. - 25 p.
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2019-12-05
10:43
MD2202: compensating long-range beam-beam effectin the LHC using DC wires / Sterbini, Guido (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Arduini, Gianluigi (CERN) ; Bartosik, Hannes (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Cattenoz, Gregory (CERN) ; Effinger, Ewald (CERN) ; Fartoukh, Stephane (CERN) et al.
his note summarizes the program of the LHC Machine Development to assess the potential and limits of the long-range beam-beam compensators held in 2017 (MD2202) [...]
CERN-ACC-NOTE-2019-0052. - 2019. - 52 p.
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2019-12-04
14:31
Initial longitudinal diagnostics for ELENA’s commissioning / Angoletta, Maria Elena (CERN) ; Jaussi, Michael (CERN) ; Molendijk, John (CERN)
CERN’s Extra Low ENergy Antiproton (ELENA) ring has undergone its second full year of beam commissioning in 2018. [...]
CERN-ACC-NOTE-2019-0051. - 2019.

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