CERN Accelerating science

Accelerator Physics

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2019-10-22
17:27
Possible Mitigations of Longitudinal Intensity Limitations for HL-LHC Beam in the CERN SPS / Repond, Joel
The Super Proton Synchrotron (SPS) at CERN is the injector of the Large Hadron Collider (LHC), the world's largest particle collider. The High-Luminosity LHC (HL-LHC) project is a major step forward in the improvement of the LHC performances and it requires a doubling of the nominal bunch intensity of the current LHC beam. [...]
CERN-THESIS-2019-173.- Lausanne : École polytechnique fédérale de Lausanne, 2019-10-11 - 198 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-10-22
10:48
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.
Full text

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2019-10-22
10:41
MD 3290: Instability threshold measurements in the presence of a controlled external excitation / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Barranco, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Levens, Tom (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH))
During the MD 2722 an unexpected instability was observed at flat top energy during BTF measurements. [...]
CERN-ACC-NOTE-2019-0044.
- 2019. - 6 p.
Full text

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2019-10-22
06:18
Transverse beam dynamics studies with high intensity LHC beams in the SPS / Carlà, Michele (CERN) ; Bartosik, Hannes (CERN) ; Beck, Mario (CERN) ; Carver, Lee (CERN ; U. Liverpool (main)) ; Kain, Verena (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Rumolo, Giovanni (CERN) ; Zannini, Carlo (CERN)
In order to reach the target beam parameters of the LHC injectors upgrade (LIU), about twice the presently operational intensity of LHC type beams has to be achieved. Although the planned upgrade of the main RF system will occur during the long shutdown, a series of measurements have been performed to assess the beam dynamics challenges with these very high intensity beams on the long SPS injection plateau. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS089 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS089

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2019-10-22
06:18
Transverse emittance studies at extraction of the CERN PS Booster / Antoniou, Fanouria (CERN) ; Albright, Simon (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Di Giovanni, Gian Piero (CERN) ; Forte, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Valdivieso, Ana (CERN) ; Huschauer, Alexander (CERN) ; Mikulec, Bettina (CERN) et al.
Transverse emittance discrepancy in the beam transfer between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is observed in operational conditions for the LHC beams at CERN. The ongoing LHC Injectors Upgrade (LIU) project requires a tight budget for beam degradation along the injector chain and therefore the reason for this emittance discrepancy needs to be understood. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS087 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS087

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2019-10-22
06:18
Commissioning of a new digital transverse damper system at the PSB / Di Giovanni, Gian Piero (CERN) ; Antoniou, Fanouria (CERN) ; Blas, Alfred (CERN) ; Brischetto, Ylenia (CERN) ; Findlay, Alan (CERN) ; Kotzian, Gerd (CERN) ; Mikulec, Bettina (CERN) ; Sterbini, Guido (CERN)
At the CERN Proton Synchrotron Booster, PSB, an analog transverse damper system has been in operation since 1999, providing satisfactory operational results with the proton beam supplied by Linac2. As a consequence of the LHC Injectors Upgrade, the PSB will face new challenges imposed by higher intensity, injection and extraction energy. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS085 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS085

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2019-10-22
06:18
Status of the ESSnuSB accumulator design / Zou, Ye (Uppsala U. (main)) ; Bouquerel, Elian (Strasbourg, IPHC) ; Dracos, Marcos (Strasbourg, IPHC) ; Ekelöf, Tord (Uppsala U. (main)) ; Eshraqi, Mohammad (ESS, Lund) ; Gålnander, Björn (ESS, Lund) ; Olvegård, Maja (Uppsala U. (main)) ; Ruber, Roger (Uppsala U. (main)) ; Schönauer, Horst (CERN) ; Wildner, Elena (CERN)
The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high performance neutrino beam. The ESS neutrino Super Beam intends to measure, with precision, the charge-parity (CP) violating lepton phase at the 2nd oscillation maximum. [...]
2019 - 3 p. - Published in : 10.18429/JACoW-IPAC2019-MOPRB046 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPRB046

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2019-10-22
06:18
A two-mode model to study the effect of space charge on TMCI in the "long-bunch" regime / Métral, Elias (CERN)
Using a two-mode approach for the Transverse Mode-Coupling Instability (TMCI) in the “short-bunch” regime (where the mode-coupling takes place between the modes 0 and – 1, such as in the CERN LHC), both a reactive damper (ReaD) and Space Charge (SC) are expected to be beneficial: the ReaD would shift the mode 0 up while SC would shift the mode – 1 down, but in both cases the coupling (and related instability) would occur at higher intensities. However, the situation is more involved in the “long-bunch” regime (where the mode-coupling takes place between higher-order modes, such as in the CERN SPS). [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW088 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW088

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2019-10-22
06:18
Study of fringe fields effects from final focus quadrupoles on beam based measured quantities / Pugnat, Thomas (IRFU, Saclay) ; Bonaventura, Luca (Milan, Polytech.) ; Dalena, Barbara (IRFU, Saclay) ; De Maria, Riccardo (CERN) ; Berglyd Olsen, Veronica (CERN) ; Simona, Abele (Milan, Polytech.)
Accelerator physics needs advanced modeling and simulation techniques, in particular for beam stability studies. A deeper understanding of the effects of magnetic fields non-linearities will greatly help in the improvement of future colliders design and performance. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW012 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW012

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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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