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1.
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.
- 2016. - 12 p.
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2.
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.
- 2016. - 6 p.
CERN-ACC-NOTE-2016-0023
3.
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.
- 2016. - 9 p.
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4.
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.
- 2017. - 11 p.
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5.
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.
- 2016. - 5 p.
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6.
Probing the behaviour of high brightness bunches in collision at 6.5 TeV and the interplay with an external source of noise (MD1433) / Buffat, Xavier (CERN) ; Biancacci, Nicolo (CERN) ; Furuseth, Sondre Vik ; Jacquet, Delphine (CERN) ; Metral, Elias (CERN) ; Pellegrini, Dario (CERN) ; Pojer, Mirko (CERN) ; Trad, Georges (CERN) ; Valuch, Daniel (CERN) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) et al.
The results of an experiment aiming at colliding high brightness bunches at 6.5 TeV in the LHC and probing the interplay between external noise and head on beam-beam interaction are presented. [...]
CERN-ACC-NOTE-2017-0030.
- 2017. - 16 p.
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7.
MD 2197: Experimental studies of Landau damping by means of Beam Transfer Function measurements in the presence of beam-beam interactions and diffusive mechanisms / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Barros Marin, Manoel (CERN) ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Hostettler, Michi (Universitaet Bern (CH)) ; Lefevre, Thibaut (CERN) ; Louro Alves, Diogo Miguel (CERN) et al.
Beam Transfer Function (BTF) measurements are direct measurement of the stability diagrams that define the stability threshold of coherent beam instabilities driven by the impedance. [...]
CERN-ACC-NOTE-2018-0017.
- 2018. - 8 p.
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8.
MD 1856 - 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 several instabilities were developing during the betatron squeeze where beam-beam interactions become stronger modifying the tune spread provided by the octupoles magnets. [...]
CERN-ACC-NOTE-2017-0027.
- 2017.
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9.
MD 3292: Measurements of Landau Damping by Means of BTF Measurements / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Buffat, Xavier (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Levens, Tom (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) et al.
The methodology applied in previous MDs has shown the possibility of using BTFs measurements to estimate the transverse Landau Damping of the beams for different machine configurations. [...]
CERN-ACC-NOTE-2019-0045.
- 2019. - 10 p.
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10.
MD 2722: Investigation of Landau damping by means of BTF measurements / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Barros Marin, Manoel (CERN) ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Hostettler, Michi (Universitaet Bern (CH)) ; Lefevre, Thibaut (CERN) ; Levens, Tom (CERN) et al.
Stability diagrams quantify the LHC stability thresholds due to the beam coupling impedance. [...]
CERN-ACC-NOTE-2018-0016.
- 2018. - 9 p.
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