CERN Accelerating science

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1.
Start collisions at 1m β∗ (MD 3349) / Calia, Andrea (CERN) ; Jacquet, Delphine (CERN) ; Wenninger, Jorg (CERN) ; Fuchsberger, Kajetan ; Hostettler, Michi (CERN)
This document summarises the LHC Machine Development session on colliding at β∗ = 1 m and squeezing with colliding beams to β∗ = 25 cm in IP 1 and 5 using the capabilities of the LumiServer. [...]
CERN-ACC-NOTE-2022-0006.
- 2021. - 6 p.
Full text
2.
MD2490 – Measurement of the TMCI threshold at flat-top in the LHC / Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fuchsberger, Kajetan ; Mereghetti, Alessio ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
This report summarizes the results of MD2490 on the measurement of the intensity threshold of the Transverse Mode Coupling Instability (TMCI) in the LHC at flat top. [...]
CERN-ACC-NOTE-2020-0056.
- 2020.
Full text
3.
An alternative method to measure amplitude dependence of the closest tune approach / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN) ; Fuchsberger, Kajetan
In the linear regime, a minimum closest approach of the fractional horizontal and vertical tunes exists, due to linear coupling between the transverse planes. [...]
CERN-ACC-NOTE-2020-0007.
- 2020.
Full text
4.
Beam-induced heat loads on the LHC arc beam screens with different beam and machine configurations: experiments and comparison against simulations / Iadarola, Giovanni (CERN) ; Skripka, Galina (Joint Institute for Nuclear Research (RU)) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Andujar, Oscar (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Argyropoulos, Theodoros (CERN) ; Bradu, Benjamin (CERN) ; Bartosik, Hannes (CERN) et al.
Electron cloud (e-cloud) effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. [...]
CERN-ACC-NOTE-2019-0057.
- 2019. - 50 p.
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5.
Operation and performance of the CERN Large Hadron Collider during proton Run 2 / Steerenberg, Rende (CERN) ; Albert, Markus (CERN) ; Alemany-Fernández, Reyes (CERN) ; Argyropoulos, Theodoros (CERN) ; Bravin, Enrico (CERN) ; Crockford, Guy (CERN) ; Dumont, Jean-Charles (CERN) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) ; Giovannozzi, Massimo (CERN) et al.
Run 2 of the CERN Large Hadron Collider (LHC) started in April 2015 and was successfully completed on 10th December 2018, achieving largely all goals set in terms of luminosity production. Following the first two-year long shutdown and the re-commissioning in 2015 at 6.5 TeV, the beam performance was increased to reach a peak luminosity of more than twice the design value and a colliding beam time ratio of 50%. [...]
CERN-ACC-2019-067.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPMP031 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP031
6.
Detailed review of the LHC optics commissioning for the nonlinear era / Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Fuchsberger, Kajetan (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Giovannozzi, Massimo (CERN) ; Hofer, Michael (Vienna University of Technology (AT)) ; Malina, Lukas (CERN) et al.
In 2017, optics commissioning strategy for low-β∗ operation of the CERN Large Hadron Collider (LHC) underwent a major revision. [...]
CERN-ACC-2019-0029.
- 2019.
Full text
7.
Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations / Persson, Tobias (CERN) ; Baud, Guillaume (CERN) ; Buffat, Xavier (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gąsior, Marek (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) et al.
Transverse coupling has been linked to instabilities and reduction in dynamic aperture and is hence a crucial parameter to control in the LHC. In this article we describe the development to use driven oscillations to measure the transverse coupling with high intensity beams. [...]
CERN-ACC-2018-079.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF047 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF047
8.
Crossing Angle Anti-Leveling at the LHC in 2017 / Karastathis, Nikolaos (CERN) ; Fuchsberger, Kajetan (CERN) ; Hostettler, Michael (CERN) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN)
In 2017, LHC incorporated in operation an anti-leveling procedure of adapting the crossing angle of the colliding beams in steps to increase the integrated luminosity. In this paper, we present the Dynamic Aperture simulations that were employed to identify the operational margins, and therefore define the leveling steps. [...]
CERN-ACC-2018-125.- 2018 - 5 p. - Published in : (2018) , pp. MOPMF040
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 022004 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF040
9.
LHC Operational Scenarios During 2017 Run / Salvachua, Belen (CERN) ; Albert, Markus (CERN) ; Alemany-Fernández, Reyes (CERN) ; Argyropoulos, Theodoros (CERN) ; Bravin, Enrico (CERN) ; Burkhardt, Helmut (CERN) ; Crockford, Guy (CERN) ; Dumont, Jean-Charles (CERN) ; Fartoukh, Stephane (CERN) ; Fuchsberger, Kajetan (CERN) et al.
During 2017, the Large Hadron Collider LHC delivered luminosity for different physics configuration in addtion to the nominal 6.5 TeV proton-proton run. About 18.5 days were dedicated to commission and to deliver special physics to the experiments. [...]
CERN-ACC-2018-165.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF051 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF051
10.
LHC Operational Experience of the 6.5 TeV Proton Run with ATS Optics / Pojer, Mirko (CERN) ; Albert, Markus (CERN) ; Alemany-Fernández, Reyes (CERN) ; Argyropoulos, Theodoros (CERN) ; Bravin, Enrico (CERN) ; Calia, Andrea (CERN) ; Crockford, Guy (CERN) ; Fartoukh, Stephane (CERN) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) et al.
In May 2017, the CERN Large Hadron Collider (LHC) restarted operations at 6.5 TeV using the Achromatic Telescopic Squeeze (ATS) scheme with a target beta-star of 40 cm in ATLAS and CMS. The number of bunches was progressively increased to a maximum of 2556 with emittances of 2.5 um. [...]
CERN-ACC-2018-166.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF050 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF050

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