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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.
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2019. - 50 p.
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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
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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.
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2019. - 8 p.
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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.
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2019. - 12 p.
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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
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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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LHC Operation at 6.5 TeV: Status and Beam Physics Issues
/ Papotti, Giulia (CERN) ; Albert, Markus (CERN) ; Alemany-Fernandez, Reyes (CERN) ; Bravin, Enrico (CERN) ; Crockford, Guy (CERN) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Höfle, Wolfgang (CERN) et al.
LHC operation restarted in 2015 after the first Long Shutdown, planning for a 4-year long run until the end of 2018 (called Run 2). The beam energy was fixed at 6.5 TeV. [...]
NAPAC-2016-MOB3IO02.-
2017 - 5 p.
- Published in : 10.18429/JACoW-NAPAC2016-MOB3IO02
Fulltext: PDF; External link: JACoW
In : 2016 North American Particle Accelerator Conference, Chicago, IL, USA, 9 - 14 Oct 2016, pp.MOB3IO02
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The Ghost Train Instability (MDs 2066 and 2936)
/ Carver, Lee Robert (University of Liverpool (GB)) ; Alemany Fernandez, Reyes (CERN) ; Amorim, David (Centre National de la Recherche Scientifique (FR)) ; Antipov, Sergey (CERN) ; Barraud, Laurent (Centre National de la Recherche Scientifique (FR)) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Crockford, Guy (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) et al.
This notes describes experimental studies of the octupole strength required to stabilise bunch trains at 6.5 TeV in the LHC, performed over 3 MD blocks in 2017. [...]
CERN-ACC-NOTE-2018-0013.
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2018. - 13 p.
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Limitations due to strong head-on beam-beam interactions (MD 1434)
/ Buffat, Xavier (CERN) ; Furuseth, Sondre Vik ; Iadarola, Giovanni (CERN) ; Papadopoulou, Parthena Stefania (University of Crete (GR)) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; Pojer, Mirko (CERN) ; Crockford, Guy (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Trad, Georges (CERN) et al.
The results of an experiment aiming at probing the limitations due to strong head on beam-beam interactions are reported. [...]
CERN-ACC-NOTE-2017-0044.
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2017. - 11 p.
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Operation of the LHC with Protons at High Luminosity and High Energy
/ Papotti, Giulia (CERN) ; Albert, Markus (CERN) ; Alemany-Fernandez, Reyes (CERN) ; Crockford, Guy (CERN) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Höfle, Wolfgang (CERN) ; Jacquet, Delphine (CERN) et al.
In 2015 the Large Hadron Collider (LHC) entered the first year in its second long Run, after a 2-year shutdown that prepared it for high energy. The first two months of beam operation were dedicated to setting up the nominal cycle for proton-proton operation at 6.5 TeV/beam, and culminated with the first physics with 3 nominal bunches/ring at 13 TeV CoM on 3 June. [...]
CERN-ACC-2016-229.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-WEOCA01
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEOCA01
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