CERN Accelerating science

Accelerator Physics

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2019-10-23
06:55
Resonant slow extraction with constant optics for improved separatrix control at the extraction septum / Kain, V (CERN) ; Velotti, F M (CERN) ; Fraser, M A (CERN) ; Goddard, B (CERN) ; Prieto, J (CERN) ; Stoel, L S (CERN) ; Pari, M (INFN, Padua)
Losses and component activation are limiting performance factors for slow extraction with high-power applications, and new techniques of loss-reduction, such as bent crystals, require a stable and narrow separatrix angular spread. Conventional tune-sweep slow extraction results in an optics change and an accompanying separatrix rotation through the spill. [...]
2019 - 8 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 101001 Fulltext from Publisher: PDF;

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2019-10-23
06:55
Collimation of heavy-ion beams in the HE-LHC / Abramov, Andrey (JAI, UK ; CERN ; Royal Holloway, U. of London) ; Bruce, Roderik (CERN) ; Crouch, Matthew (CERN) ; Fuster-Martínez, Nuria (CERN) ; Mereghetti, Alessio (CERN) ; Molson, James (CERN) ; Nevay, Laurence (JAI, UK ; Royal Holloway, U. of London ; CERN) ; Redaelli, Stefano (CERN)
A design study for a future collider to be built in the LHC tunnel, the High-Energy Large Hadron Collider (HE-LHC), has been launched as part of the Future Circular Collider (FCC) study at CERN. It would provide proton collisions at a centre-of-mass energy of 27 TeV as well as collisions of heavy ions at the equivalent magnetic rigidity. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPRB059 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPRB059

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2019-10-23
06:55
Numerical simulations of the DC wire prototypes in the LHC for enhancing the HL-LHC performances / Poyet, Axel (CERN ; U. Grenoble Alpes) ; Fartoukh, Stephane (CERN) ; Karastathis, Nikolaos (CERN) ; Papaphilippou, Yannis (CERN) ; Skoufaris, Kyriacos (CERN) ; Sterbini, Guido (CERN)
For the last 20 years, the compensation of the Beam-Beam Long-Range interactions in colliders using DC wires has been studied. In 2015, in the frame of the HL-LHC project, it has been shown that a compensation of most of the Resonance Driving Terms generated by the BBLR interactions is possible using wires with constraints on their transverse and longitudinal positions. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPMP052 Fulltext: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP052

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2019-10-23
06:55
Developments in the experimental interaction regions of the High Energy LHC / van Riesen-Haupt, Léon (Oxford U. ; JAI, UK) ; Abelleira, Jose Luis (JAI, UK ; Oxford U.) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Cruz Alaniz, Emilia (JAI, UK ; Oxford U.) ; Hofer, Michael (CERN) ; Keintzel, Jacqueline (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Tambasco, Claudia (Ecole Polytechnique, Lausanne) ; Tomás, Rogelio (CERN) ; Zimmermann, Frank (CERN)
The High Energy LHC (HE-LHC) aims to collide 13.5 TeV protons in two high luminosity experiments and two low luminosity experiments. In the following, the recent updates in the two high luminosity experimental interaction regions (EIR) of the HE-LHC will be illustrated. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPMP039 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP039

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2019-10-23
06:55
Effect of emittance constraints on monochromatization at the Future Circular e$^+$e$^-$ Collider / Valdivia García, Marco (CERN ; Guanajuato U.) ; Zimmermann, Frank (CERN)
Direct s-channel Higgs production in e$^+$e$^-$ collisions is of interest if the collision energy spread can be comparable to the natural width of the standard model Higgs boson. At the Future Circular e$^+$e$^-$ Collider (FCC-ee) [1], a monochromatization scheme could be employed in order to reduce the collision energy spread to the target value. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPMP035 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP035

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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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