CERN Accelerating science

All CERN Accelerators documents

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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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2019-12-04
14:27
New LLRF capabilities and beam results for the second year of ELENA’s commissioning / Angoletta, Maria Elena (CERN) ; Jaussi, Michael (CERN) ; Molendijk, John (CERN)
CERN’s Extra Low ENergy Antiproton (ELENA) ring underwent its second full year of beam commissioning in 2018. [...]
CERN-ACC-NOTE-2019-0050.
- 2019.
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2019-12-02
16:42
Top quark mass measurement in radiative events at electron-positron colliders / Boronat, Marca (Univ. of Valencia and CSIC (ES)) ; Fullana Torregrosa, Esteban (Univ. of Valencia and CSIC (ES)) ; Fuster Verdu, Juan (Univ. of Valencia and CSIC (ES)) ; Gomis Lopez, Pablo (Univ. of Valencia and CSIC (ES)) ; Vos, Marcel (Univ. of Valencia and CSIC (ES)) ; Hoang, A H (University of Vienna, Faculty of Physics and Erwin Schrodinger International Institute for Mathematical Physics) ; Widl, A (University of Vienna, Faculty of Physics) ; Mateu, V (Departmento de Fisica Fundamental e IUFFyM, Universidad de Salamanca and Instituto de Fisica Teorica UAM-CSIC)
In this letter, the potential of linear e+e− colliders to measure the top quark mass in a suitable short-distance scheme in radiative events is evaluated. We present a calculation of the differential cross section for production of a top quark pair in association with an energetic photon from initial state radiation, as a function of the invariant mass of the tt ̄system [...]
CLICdp-Pub-2019-005.- Geneva : CERN, 2019 - 12. Fulltext: PDF;

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