CERN Accelerating science

Accelerator Physics

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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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2019-10-17
06:46
Tracking simulations of shadowing electrostatic septum wires by means of bent crystals / Velotti, Francesco (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Stoel, Linda (CERN)
The CERN Super Proton Synchrotron (SPS) slow extraction is a third integer resonant extraction and hence suffers from high losses at the electrostatic septum (ZS). This is one of the main limiting factors for the maximum number of Protons On Target (POT) deliverable from the SPS to the North Area (NA). [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP032 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP032

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2019-10-16
07:36
LHC optics measurement and correction software progress and plans / Tomás, Rogelio (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia-Tabares, Ana (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) et al.
LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW116 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW116

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2019-10-16
07:36
Characterisation of electro-optic pickups for high bandwidth diagnostics at the High Luminosity LHC / Arteche, Alberto (JAI, UK ; Royal Holloway, U. of London) ; Bashforth, Sophie (JAI, UK ; Royal Holloway, U. of London) ; Bosco, Alessio (JAI, UK ; Royal Holloway, U. of London) ; Gibson, Stephen (JAI, UK ; Royal Holloway, U. of London) ; Krupa, Michal (CERN) ; Lefèvre, Thibaut (CERN) ; Penman, Inada (JAI, UK ; Royal Holloway, U. of London)
A high bandwidth electro-optical beam position monitor is under development for the High Luminosity LHC. A series of measurements of the electro-optic signals were previously obtained by an EO-BPM prototype installed in the SPS. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW088 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW088

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2019-10-16
07:36
Unsupervised machine learning for detection of faulty beam position monitors / Fol, Elena (CERN ; Goethe U., Frankfurt (main)) ; Coello de Portugal, Jaime Maria (CERN) ; Tomás, Rogelio (CERN)
Unsupervised learning includes anomaly detection techniques that are suitable for the detection of unusual events such as instrumentation faults in particle accelerators. In this work we present the application of a decision trees-based algorithm to faulty BPMs detection at the LHC. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW081 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW081

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2019-10-16
07:36
Development and test of a beam imaging system based on radiation tolerant optical fiber bundles / Celeste, Damiano (CERN) ; Bravin, Enrico (CERN) ; Burger, Stephane (CERN) ; Roncarolo, Federico (CERN)
Many of the beam imaging systems at CERN are located in high radiation environments. In order to cope with this issue, VIDICON cameras are presently used, but their production has been discontinued worldwide. [...]
2019 - 3 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW078 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW078

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2019-10-16
07:35
Damping bunch oscillations due to off-axis injection / Zimmermann, Frank (CERN) ; Etisken, Ozgur (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (CERN) ; Ogur, Salim (CERN) ; Oide, Katsunobu (CERN) ; Papaphilippou, Yannis (CERN) ; Salvant, Benoit (CERN)
In the FCC-ee pre-injector complex, a slightly modified SPS can serve as pre-booster. The baseline design foresees injecting the low-emittance electron and positron bunches off-axis into the SPS, and deploying strong wigglers to greatly enhance the radiation damping at the injection energy. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP041 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP041

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