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Beam-beam effects long-range and head-on
/ Pieloni, T (CERN) ; Banfi, D (Ecole Polytechnique, Lausanne) ; Barranco, J (Ecole Polytechnique, Lausanne) ; Crouch, M (Manchester U.) ; Buffat, X (CERN) ; Tambasco, C (CERN) ; Metral, E (CERN) ; Salvachua, B (CERN) ; Pojer, M (CERN) ; Giachino, R (CERN) et al.
The 2015 LHC run has shown the beauty of having weaker beam-beam effects with
respect to 2012 physics run. The 2015 setup has been defined to allow Landau
octupole and chromaticity to be powered at maximum currents to fight coherent
instabilities. [...]
Geneva : CERN, 2016 - 12 p.
- Published in : (2016) , pp. 111-122
Fulltext: PDF;
In : 6th Evian Workshop on LHC beam operation, Evian Les Bains, France, 15 - 17 Dec 2015, pp.111-122
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2.
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Long-range and head-on beam-beam: what are the limits?
/ Buffat, X (CERN) ; Arduini, G (CERN) ; Bravin, E (CERN) ; Iadarola, G (CERN) ; Métral, E (CERN) ; Papaphilippou, Y (CERN) ; Pellegrini, D (CERN) ; Redaelli, S (CERN) ; Salvachua, B (CERN) ; Solfarloli, M (CERN) et al.
The present understanding of the performance limitations due to beam-beam interactions in the LHC is detailed based on data obtained during the physics run as well as dedicated experiments in 2016..
Geneva : CERN, 2017 - 8 p.
- Published in : (2017) , pp. 133-140
Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.133-140
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3.
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MD 402: Head-on limits. Separation leveling.
/ Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Crouch, Matthew ; Salvachua Ferrando, Belen Maria (CERN) ; Pojer, Mirko (CERN) ; Trad, Georges (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Jacquet, Delphine (CERN) et al.
HL-LHC will rely on very large beam-beam head-on shift and spread. [...]
CERN-ACC-NOTE-2016-0023.
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2016. - 6 p.
CERN-ACC-NOTE-2016-0023
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4.
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Long range beam-beam interaction and the effect on the beam and luminosity lifetimes
/ Crouch, Matthew (University of Manchester, Manchester, U.K / The Cockcroft) ; Pieloni, Tatiana (CERN) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Banfi, Danilo ; Buffat, Xavier (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Alexahin, Yuri ; Bruce, Roderik (CERN) ; Giachino, Rossano (CERN) ; Pojer, Mirko (CERN) et al.
Identifying the minimum crossing angle achievable in the LHC is a key parameter to identify the collider luminosity reach [...]
CERN-ACC-NOTE-2016-0019.
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2016. - 12 p.
Full text
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Impact of Long Range Beam-Beam Effects on Intensity and Luminosity Lifetimes from the 2015 LHC Run
/ Crouch, Matthew (U. Manchester (main)) ; Appleby, Robert (U. Manchester (main)) ; Banfi, Danilo (EPFL-ISIC, Lausanne) ; Barranco, Javier (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Muratori, Bruno (Daresbury) ; Pojer, Mirko (CERN) ; Salvachua, Belen (CERN) ; Tambasco, Claudia (EPFL-ISIC, Lausanne) et al.
Luminosity is one of the key parameters that determines the performance of colliding beams in the Large Hadron Collider (LHC). Luminosity can therefore be used to quantify the impact of beam-beam interactions on the beam lifetimes and emittances. [...]
CERN-ACC-2016-263.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-TUPMW007
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW007
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6.
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First BTF Measurements at the Large Hadron Collider
/ Tambasco, Claudia (CERN ; Ecole Polytechnique, Lausanne) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Fuchsberger, Kajetan (CERN) ; Gąsior, Marek (CERN) ; Giachino, Rossano (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN) ; Pieloni, Tatiana (CERN) et al.
During the Run I in 2012, several instabilities have been observed at the Large Hadron Collider (LHC) during the Betatron squeeze. The predictions of instability thresholds are based on the computation of the beam Landau damping by calculating the Stability Diagrams (SD). [...]
CERN-ACC-2016-194.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-WEPOY030
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOY030
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7.
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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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MD 1407 - Landau Damping: Beam Transfer Functions and diffusion mechanisms
/ Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Gasior, Marek (CERN) ; Lefevre, Thibaut (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Pojer, Mirko (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
In the 2012, 2015 and 2016 run several instabilities were developing at flat-top, during and at the end of the betatron squeeze where beam-beam interactions are present. [...]
CERN-ACC-NOTE-2017-0026.
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2017.
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9.
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MD 400: LHC emittance growth in presence of an external source of noise during collision
/ Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Trad, Georges (CERN) ; Valuch, Daniel (CERN) ; Betz, Michael (CERN) ; Wendt, Manfred (CERN) ; Pojer, Mirko (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
The interplay between head-on beam-beam interaction and external sources of noise can be a significant source of emittance growth, especially when considering large beam-beam tune shifts as for the HL-LHC upgrade project. [...]
CERN-ACC-NOTE-2016-0020.
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2016. - 9 p.
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MD 382: Beam Transfer Function and diffusion mechanisms
/ Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Crouch, Matthew (University of Manchester, Manchester, U.K / The Cockcroft Institute, Daresbury, U.K.) ; Pieloni, Tatiana (CERN) ; Boccardi, Andrea (CERN) ; Fuchsberger, Kajetan (CERN) ; Gasior, Marek (CERN) ; Kotzian, Gerd (CERN) ; Lefevre, Thibaut (CERN) et al.
The Beam Transfer Function (BTF) measurements have been previously tested in the LHC during MD block 1 and 2. [...]
CERN-ACC-NOTE-2016-0016.
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2016. - 5 p.
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