CERN Accelerating science

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2017-04-26
14:11
MD 1691: Active halo control using tune ripple at injection / Garcia Morales, Hector (University of London (GB)) ; Wagner, Joschka (Johann-Wolfgang-Goethe Univ. (DE)) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN) ; Fitterer, Miriam (Fermi National Accelerator Lab. (US)) ; Fiascaris, Maria (CERN) ; Nisbet, David (CERN) ; Thiesen, Hugues (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Xu, Chen (CERN)
In this MD we performed halo excitation through tune ripple. [...]
CERN-ACC-NOTE-2017-0031.
- 2017. - 11 p.
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2017-04-26
06:54
Long term dynamics of the high luminosity Large Hadron Collider with crab cavities / Barranco García, J (EPFL-ISIC, Lausanne ; CERN) ; De Maria, R (CERN) ; Grudiev, A (CERN) ; Tomás García, R (CERN) ; Appleby, R  B (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Brett, D  R (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.)
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to achieve an integrated luminosity of 200–300  fb-1 per year, including the contribution from the upgrade of the injector chain. For the HL-LHC the larger crossing angle together with a smaller beta function at the collision point would result in more than 70% luminosity loss due to the incomplete geometric overlap of colliding bunches. [...]
2016 - 9 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 101003 Fulltext: PDF;

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2017-04-25
14:25
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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2017-04-25
09:25
MD468: Electron Cloud Reference Fills and Dependence on the Bunch Intensity / Iadarola, Giovanni (CERN) ; Dijkstal, Philipp (Technische Universitaet Darmstadt (DE)) ; Mether, Lotta (Ecole Polytechnique Federale de Lausanne (CH)) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Rumolo, Giovanni (CERN)
This note describes a Machine Development session performed to investigate the dependence of e-cloud build-up and instabilities on the bunch population of the circulating beam. [...]
CERN-ACC-NOTE-2017-0029.
- 2017.

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2017-04-25
09:19
MD421: Electron cloud studies on 25 ns beam variants (BCMS, 8b+4e) / Iadarola, Giovanni (CERN) ; Bartosik, Hannes (CERN) ; Belli, Eleonora (Sapienza Universita e INFN, Roma I (IT)) ; Carver, Lee Robert (CERN) ; Dijkstal, Philipp (Technische Universitaet Darmstadt (DE)) ; Li, Kevin Shing Bruce (CERN) ; Mether, Lotta (Ecole Polytechnique Federale de Lausanne (CH)) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Rumolo, Giovanni (CERN)
This note describes a Machine Development session performed with the main goal of studying the e-cloud mitigation that can be obtained by injecting mixed trains of 8b+4e beam type and trains having the standard 25 ns structure. [...]
CERN-ACC-NOTE-2017-0028.
- 2017.

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2017-04-25
09:01
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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2017-04-25
08:53
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.
- 2017.
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2017-04-24
15:22
Report from LHC MD 1399: Effect of linear coupling on nonlinear observables in the LHC. / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Simulation work during Run 1 established that linear coupling had a large impact on nonlinear observables such as detuning with amplitude and dynamic aperture. [...]
CERN-ACC-NOTE-2017-0024.
- 2017. - 11 p.
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2017-04-06
14:42
MD#1182: Calibration of diamond particle detectors in IP6 / Valette, Matthieu (CERN) ; Wollmann, Daniel (CERN) ; Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Wiesner, Christoph (CERN)
In case of an asynchronous beam dump with a fully filled LHC machine it is expected that all standard ionisation chamber Beam Loss Monitors (IC BLM) around the LHC dumping region in IP6 will be saturated. [...]
CERN-ACC-2017-0018.
- 2017. - 8 p.
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2017-04-03
09:40
Crystal Collimation with protons at flat top energy / Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Redaelli, Stefano (CERN) ; Galluccio, Francesca (Universita e INFN, Napoli (IT)) ; Masi, Alessandro (CERN) ; Mirarchi, Daniele (CERN) ; Montesano, Simone (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Scandale, Walter (CERN)
During this MD, performed on November 6th, 2015, bent silicon crystals were tested with proton beams for a possible usage of crystal-assisted collimation. [...]
CERN-ACC-NOTE-2017-0021.
- 2017. - 6 p.
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