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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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2019-12-05
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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2019-11-26
07:49
Measurement of the LHC beam profile using the Beam Gas Vertex detector / Wurkner, Benedikt
The Beam Gas Vertex (BGV) demonstrator was developed for the Large Hadron Collider (LHC) to demonstrate the feasibility of a beam profile measurement device using a tracking detector to reconstruct beam-gas interactions [...]
CERN-THESIS-2019-217 - 106 p.

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2019-11-25
12:13
A new proposal for damping the resonances in CERN accelerators, using HOM couplers / Gilardi, Antonio
Parasitic resonances are a fundamental problem in the world of accelerators (there are also resonating cavities, but in this case the resonance is designed and is used to accelerate the beam) [...]
CERN-THESIS-2017-480 https://doi.org/10.1016/j.measurement.2019.07.034. - volume = "146", pages = "938 - 947" : Measurement, 2019-11-01. - 136 p.

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2019-11-13
09:45
Optics-measurement-based Beam Position Monitor Calibration. / Garcia-Tabares Valdivieso, Ana
Accurate measurements of the focusing properties of an accelerator are essential for proper operation of a synchrotron, both for the machine protection and for the performance of the experiment [...]
CERN-THESIS-2019-211 - 153 p.

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2019-11-12
16:55
Measurement and Simulation of the Longitudinal Impedance of the LHCb VELO / Popovic, Branko Kosta (CERN) ; Vollinger, Christine (CERN)
Impedance analysis of any new or redesigned components of the LHC machine is vital in ensuring beam stability and for inclusion in the overall impedance budget. [...]
CERN-ACC-NOTE-2019-0048. - 2019. - 8 p.

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2019-11-01
06:03
Space charge and transverse instabilities at the CERN SPS and LHC / Métral, Elias (CERN) ; Amorim, David (CERN) ; Arduini, Gianluigi (CERN) ; Bartosik, Hannes (CERN) ; Benedetto, Elena (CERN) ; Burkhardt, Helmut (CERN) ; Li, Kevin (CERN) ; Oeftiger, Adrian (CERN) ; Quatraro, Diego (CERN) ; Rumolo, Giovanni (CERN) et al.
At the CERN accelerator complex, it seems that only the highest energy machine in the sequence, the LHC, with space charge (SC) parameter close to one, sees the predicted beneficial effect of SC on transverse coherent instabilities. In the other circular machines of the LHC injector chain (PSB, PS and SPS), where the SC parameter is much bigger than one, SC does not seem to play a major (stabilising) role, and it is maybe the opposite in the SPS. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-ICAP2018-SUPAG01 Fulltext from publisher: PDF;
In : 13th International Computational Accelerator Physics Conference (ICAP 2018), Key West, FL, USA, 20 - 24 Oct 2018, pp.SUPAG01

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2019-10-26
07:04
Development of Radiation-Hard Solid-State Amplifiers for Kilogray Environments Using COTS Components / Ohmori, Chihiro (J-PARC) ; Paoluzzi, Mauro (CERN)
The high-luminosity Large Hadron Collider (LHC) (HL-LHC) project is the upgrade of the LHC to increase its luminosity by a factor of 5 compared with the nominal value. The LHC injector upgrade (LIU) project aims at upgrading the LHC injector chain to reach the goal of the HL-LHC. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 2188-2195 Fulltext: PDF;

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