CERN Accelerating science

Accelerator Physics

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2019-10-21
12:39
Simulation and optimization of beam losses during continuous transfer extraction at the CERN Proton Synchrotron / Barranco García, J. (CERN) ; Gilardoni, S. (CERN)
The proton beams used for the fixed target physics at the Super Proton Synchrotron (SPS) are extracted from the Proton Synchrotron (PS) by a multiturn technique called continuous transfer (CT). During the CT extraction, large losses are observed in locations where the machine aperture should be large enough to accommodate the circulating beam. [...]
2018 - 10 p. Fulltext: PDF;
In : ICFA Mini-Workshop on Tracking for Collimation in Particle Accelerators, CERN, Geneva, Switzerland, 30 Oct 2015, pp.189 (CERN-2018-011-CP)

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2019-10-21
10:06
MARS15-Based System for Beam Loss and Collimation Studies / Mokhov, N.V. (FERMILAB) ; Tropin, I.S. (FERMILAB)
The system includes the newest version of the MARS15 code for particle production and transport in accelerator components integrated with a novel highprecision tracker/stepper for multi-turn tracking merged with MAD-X. The overall approach is described with all the essential features and programming issues highlighted. [...]
2018 - 16 p. Fulltext: PDF;
In : ICFA Mini-Workshop on Tracking for Collimation in Particle Accelerators, CERN, Geneva, Switzerland, 30 Oct 2015, pp.57 (CERN-2018-011-CP)

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2019-10-19
06:02
Transverse emittance measurement in the CERN Proton Synchrotron in view of beam production for the High-Luminosity LHC / Senes, Eugenio (CERN ; JAI, UK ; U. Oxford (main)) ; Emery, Jonathan (CERN) ; Forte, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Guerrero Ollacarizqueta, Ana (CERN) ; Huschauer, Alexander (CERN) ; Roncarolo, Federico (CERN) ; Sirvent, Jose (CERN ; Barcelona U.) ; Skowroński, Piotr (CERN) ; Tecker, Frank (CERN)
In the framework of the LHC Injectors Upgrade project the improvements required to achieve the parameters of the future beams for the High-Luminosity LHC are being studied and implemented. In order to deliver high brightness beams, control over the beam intensity and emittance is fundamental. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS100 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS100

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2019-10-19
06:01
A modular optical firing interface for CERN’s generic power converter control platform / Di Cosmo, Matteo (CERN) ; Gaime, Thomas (CERN) ; Todd, Benjamin (CERN)
The power converters group at CERN has developed a third generic converter controller (FGC3) and regulation platform (RegFGC3), capable of controlling any of CERN's power converters. This platform provides electrical connections to the low-level control elements of power converters, and in some cases a galvanic isolation is required between the converter controller output, and the power converter under control. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPMP034 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPMP034

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2019-10-19
06:01
Linear and non-linear optics measurements in PS using turn-by-turn BPM data / Skowroński, Piotr (CERN) ; Giovannozzi, Massimo (CERN) ; Huschauer, Alexander (CERN)
For the first time, the optics of the CERN Proton Synchrotron (PS) was measured using turn-by-turn BPM data of forced betatron oscillations excited with an AC dipole. We report results of phase advance and beta-beating measurements. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS102 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS102

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2019-10-19
06:01
Updates on alternative pre-booster ring design and wiggler magnet considerations of SPS for the FCC $e^{+}e^{-}$ injector / Etisken, Ozgur (Ankara U. ; CERN) ; Antoniou, Fanouria (CERN) ; Çiftçi, Abbas (Izmir U. Economics, Izmir) ; Papaphilippou, Yannis (CERN) ; Tydecks, Tobias (CERN)
The Future Circular $e^{+}e^{−}$ Collider (FCC-$e^{+}e^{−}$) injector complex needs to produce and to transport a high-intensity $e^{+}e^{−}$ beam at a fast repetition rate for topping up the collider at its collision energy. Two different options are under consideration as pre-accelerator before the bunches are transferred to the high-energy booster: using the existing SPS and designing a completely new ring. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS097 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS097

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2019-10-18
06:27
Matching studies between CERN PSB and PS through multi-turn beam profile acquisitions / Fraser, Matthew (CERN) ; Dutheil, Yann (CERN) ; Forte, Vincenzo (CERN) ; Guerrero, Ana (CERN) ; Huschauer, Alexander (CERN) ; Oeftiger, Adrian (CERN) ; Ogur, Salim (CERN) ; Roncarolo, Federico (CERN) ; Senes, Eugenio (CERN) ; Tecker, Frank (CERN)
In the framework of the LHC Injectors Upgrade (LIU) project, the investigation and quantification of the optics mismatch between the CERN Proton Synchrotron Booster (PSB) and PS is a crucial step in understanding the source of horizontal emittance growth between the two machines. Extensive studies were carried out to estimate the mismatch from single-pass measurements in the transfer line and to rematch the transfer line to reduce the dispersive mismatch at PS injection while keeping the betatron matching unaltered. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP025 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP025

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2019-10-18
06:27
Building the impedance model of a real machine / Salvant, Benoit (CERN) ; Amorim, David (CERN ; Grenoble, INP) ; Antipov, Sergey (CERN) ; Arsenyev, Sergey (CERN) ; Beck, Mario (CERN) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; Campelo, Jose Enrique (CERN) ; Carideo, Emanuela (CERN) ; Caspers, Fritz (CERN) et al.
A reliable impedance model of a particle accelerator can be built by combining the beam coupling impedances of all the components. This is a necessary step to be able to evaluate the machine performance limitations, identify the main contributors in case an impedance reduction is required, and study the interaction with other mechanisms such as optics nonlinearities, transverse damper, noise, space charge, electron cloud, beam-beam (in a collider). [...]
2019 - 6 p. - Published in : 10.18429/JACoW-IPAC2019-WEYPLS1 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEYPLS1

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2019-10-18
06:27
Singularities of particle trajectory caustics and beam shaping in bunch compressors / Charles, T K (CERN ; Melbourne U.) ; Paganin, D M (Monash U.) ; Boland, M J (Saskatchewan U.) ; Dowd, R T (Australia, CSIRO, Clayton)
Caustics are a common occurrence in optics, describing the bright lines seen in a well-lit coffee cup or the dancing networks of light seen at the bottom of a swimming pool on a sunny day. Recently, caustic formation in electron trajectories was identified as the mechanism driving strong current modulations in accelerated charged-particle beams. [...]
2019 - 12 p. - Published in : 10.1142/9789813279612_0008 Fulltext from publisher: PDF;
In : Nonlinear Dynamics and Collective Effects in Particle Beam Physics, Arcidosso, Italy, 19 - 22 Sep 2017, pp.103-114

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2019-10-17
06:46
The 2018 heavy-ion run of the LHC / Jowett, John (CERN) ; Bahamonde Castro, Cristina (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fartoukh, Stephane (CERN) ; Fol, Elena (CERN) ; Fuster-Martínez, Nuria (CERN) et al.
The fourth one-month Pb-Pb collision run brought LHC Run 2 to an end in December 2018. Following the tendency to reduce dependence on the configuration of the preceding proton run, a completely new optics cycle with the strongest ever focussing at the ALICE and LHCb experiments was designed and rapidly implemented, demonstrating the maturity of the collider’s operating modes. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEYYPLM2 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEYYPLM2

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