CERN Accelerating science

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2019-10-18
06:27
Crystal for slow extraction loss-reduction of the SPS electrostatic septum / Esposito, Luigi Salvatore (CERN) ; Addesa, Francesca (INFN, Rome) ; Afonin, Alexander (Serpukhov, IHEP) ; Bestman, Patrick (CERN) ; Borg, Johan (Imperial Coll., London) ; Butcher, Mark (CERN) ; Calviani, Marco (CERN) ; Chesnokov, Yuri (Serpukhov, IHEP) ; Denisov, Alexander (St. Petersburg, INP) ; Di Castro, Mario (CERN) et al.
The use of a bent crystal was investigated in order to reduce the losses at the CERN Super Proton Synchrotron (SPS) electrostatic septum (ZS) during the slow extraction of 400 GeV/c protons toward the North Area. The crystal, installed a few meters upstream of the ZS, bends protons that would otherwise impinge on the ZS wires. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP028 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP028

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2019-10-18
06:27
Update on beam transfer line design for the SPS Beam Dump Facility / Dutheil, Yann (CERN) ; Bauche, Jeremie ; Dougherty, Liam (CERN) ; Fraser, Matthew ; Goddard, Brennan (CERN) ; Heßler, Christoph (CERN) ; Kain, Verena ; Kurdej, Jakub (CERN) ; Uythoven, Jan (CERN) ; Velotti, Francesco (CERN)
The SPS Beam Dump Facility (BDF) being studied as part of the Physics Beyond Colliders (PBC) CERN project has recently reached an important milestone with the completion of the comprehensive feasibility study. The BDF is a proposed fixed target facility to be installed in the SPS North Area, to accommodate experiments such as SHiP (Search for Hidden Particles), which is most notably aiming at studying hidden sector particles. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP027 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP027

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2019-10-18
06:27
Emittance dilution from the CERN Proton Synchrotron Booster’s extraction kickers / Fraser, Matthew (CERN) ; Albright, Simon (CERN) ; Antoniou, Fanouria (CERN) ; Di Giovanni, Gian Piero (CERN) ; Dutheil, Yann (CERN) ; Forte, Vincenzo (CERN) ; Huschauer, Alexander (CERN) ; Roncarolo, Federico (CERN)
Understanding the different sources of emittance dilution along the LHC injector chain is an important part of providing the high brightness proton beams demanded by the LHC Injectors Upgrade (LIU) project. In this context, the first beam-based measurements of the magnetic waveforms of the Proton Synchrotron Booster’s (PSB) extraction kickers were carried out and used to quantify the transverse emittance blow-up during extraction and transfer to the Proton Synchrotron (PS). [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP026 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP026

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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
Alternative material choices to reduce activation of extraction equipment / Björkman, Daniel (CERN) ; Balhan, Bruno (CERN) ; Borburgh, Jan (CERN) ; Esposito, Luigi Salvatore (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Stoel, Linda (CERN) ; Vincke, Helmut (CERN)
At CERN, the Super Proton Synchrotron (SPS) is equipped with a resonant slow extraction system in Long Straight Section 2 (LSS2) towards the fixed target (FT) beam lines in the North Area. The extraction region provides the physics experiments with a quasi-DC flux of high-energy protons over a few seconds, which corresponds to tens of thousands of turns. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP024 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP024

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2019-10-18
06:27
Frequency modulated capture of cooled coasting ion beams / Albright, Simon (CERN) ; Angoletta, Maria Elena (CERN)
Transverse space charge effects in the Low Energy Ion Ring (LEIR) at CERN have been shown to be a major source of particle losses, which can be mitigated with a larger RMS longitudinal emittance. However, due to electron cooling during the injection plateau, the longitudinal density is very high prior to RF capture. [...]
2019 - 3 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP021 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP021

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2019-10-18
06:27
First experimental measurements of the caustic nature of trajectories in bunch compressors / Charles, Tessa (CERN ; Melbourne U.) ; Björklund Svensson, Jonas (Lund U.) ; Latina, Andrea (CERN) ; Thorin, Sara (Lund U., MAX-lab)
Advancements in the theory describing density perturbations in accelerated charge particle beams, known as caustics, has been gathering interest over the past few years. This proceeding describes the first experimental measurements of the caustic nature of charged particle trajectories in a particle accelerator. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEYYPLS2 Fulltext: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEYYPLS2

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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
Free electron laser driven by a high-energy high-current energy-recovery linac / Zimmermann, Frank (CERN) ; Aksakal, Husnu (Kahramanmaras U.) ; Aksoy, Avni (Ankara U.) ; Nergiz, Zafer (Nigde U.)
The proposed electron-hadron collider LHeC, based on an energy recovery linac, employs an electron beam of 20 mA current at an energy of tens of GeV. This electron beam could also be used to drive a free electron laser (FEL) operating at sub-Angstrom wavelengths. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPRB076 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPRB076

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2019-10-18
06:27
Start-to-end simulations of the Compact Light Project based on an S-band injector and an X-band linac / Marín, Eduardo (CELLS - ALBA, LLS) ; Aksoy, Avni (Ankara U., Inst. Accel. Technol.) ; Di Mitri, Simone (Sincrotrone Trieste) ; Latina, Andrea (CERN) ; Muñoz Horta, Raquel (CELLS - ALBA, LLS) ; Pérez, Francis (CELLS - ALBA, LLS) ; van der Geer, Bas (Pulsar Physics, Eindhoven)
In this paper we report the start-to-end simulation results of one of the options under consideration for the Compact-Light Project (XLS). The XLS is a hard X-ray Free Electron Laser under design, using the latest concepts for bright electron photo injectors, very high-gradient X-band structures, and innovative short-period undulators. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-TUPRB074 Fulltext: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPRB074

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