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Accelerator Physics

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2021-05-05
15:25
Considerations for a RF separated K+ beam for NA62 / Appleby, Robert Barrie (University of Manchester (GB)) ; Bernhard, Johannes (CERN) ; Dainton, John Bourke (Lancaster University (GB)) ; Gatignon, Lau (Lancaster University (GB)) ; Goudzovski, Evgueni (University of Birmingham (GB)) ; Burton, Graeme Alan ; Jones, Rhodri (CERN) ; Lazzeroni, Cristina (University of Birmingham (GB)) ; Romano, Angela (University of Birmingham (GB)) ; Ruggiero, Gennaro et al.
In this document we assess the potential of RF separation to increase the kaon content of the high-intensity secondary beam to the NA62 experiment in the CERN North Area. [...]
CERN-ACC-NOTE-2021-0013. - 2021. - 38 p.
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2021-04-22
12:04
A pulsed high-voltage decelerator system to deliver low-energy antiprotons / Husson, A (IJCLab, Orsay) ; Kim, B H (Seoul Natl. U., Dept. Phys. Astron.) ; Welker, A (CERN) ; Charlton, M (Swansea U.) ; Choi, J J (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crépin, P -P (Paris, Lab. Kastler Brossel) ; Crivelli, P (Zurich, ETH-CSCS/SCSC) et al.
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. [...]
2021 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165245

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2021-04-22
12:04
Supervised learning-based reconstruction of magnet errors in circular accelerators / Fol, E (CERN ; Frankfurt U.) ; Tomás, R (Frankfurt U.) ; Franchetti, G (Frankfurt U. ; Darmstadt, GSI)
Magnetic field errors and misalignments cause optics perturbations, which can lead to machine safety issues and performance degradation. The correlation between magnetic errors and deviations of the measured optics functions from design can be used in order to build supervised learning models able to predict magnetic errors directly from a selection of measured optics observables. [...]
2021 - 19 p. - Published in : Eur. Phys. J. Plus 136 (2021) 365 Fulltext: PDF;

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2021-04-13
06:01
Effective Target Speed-Reduction Techniques for Industrial Interferometers / Butcher, Mark (CERN) ; Grec, Lucian-Mircea (CERN) ; di Castro, Mario (CERN) ; Masi, Alessandro (CERN)
In recent years the cost, size and complexity of use of interferometers have reduced to an extent where they are now more employable in industrial applications, where their high precision and contactless measurement benefits are needed. [...]
Oct.. - 6 p.

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2021-04-12
21:34
Criticality of fast failures in the High Luminosity Large Hadron Collider / Lindstrom, Bjorn Hans Filip
Each of the two Large Hadron Collider (LHC) beams contain 362 MJ of energy [...]
CERN-THESIS-2020-318 urn:nbn:se:uu:diva-426416 ; ISBN:978-91-513-1081-7 ; oai:DiVA.org:uu-426416 ; diva2:1504630. - Uppsala, Sweden : Acta Universitatis Upsaliensis, 2021-01-05. - 115 p.

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2021-04-07
15:36
Sextupole scheme optimization for HL–LHC / Plassard, Fabien ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN)
One essential upgrade of the High Luminosity LHC (HL–LHC) to reach the desired luminosity, is the large reduction of the β-function value at the interaction points (IP) hosting the high-luminosity experiments ATLAS and CMS. [...]
CERN-ACC-NOTE-2021-0012. - 2021.

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2021-04-06
04:00
Proof of Concept of High-Temperature Superconducting Screens for Magnetic Field-Error Cancellation in Accelerator Magnets / Bortot, L. (CERN ; Darmstadt, Tech. U.) ; Mentink, M. (CERN) ; Petrone, C. (CERN) ; Van Nugteren, J. (CERN) ; Deferne, G. (CERN) ; Koettig, T. (CERN) ; Kirby, G. (CERN) ; Pentella, M. (CERN ; Turin Polytechnic) ; Perez, J.C. (CERN) ; Pincot, F.O. (CERN) et al.
Accelerators magnets must have minimal magnetic field imperfections for reducing particle-beam instabilities. [...]
arXiv:2103.14354. - 11 p.
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2021-03-31
06:26
Multifunctional radar system for remote control of environment and the Earth’s surface / Fadeenko, V B (St. Petersburg State U. ; GRANIT, St. Petersburg) ; Fadeenko, I V (St. Petersburg State U. ; GRANIT, St. Petersburg) ; Vasiliev, D A (GRANIT, St. Petersburg) ; Davydov, V V (St. Petersburg State U.) ; Yu Rud, V (Ioffe Phys. Tech. Inst.)
The radar method for remote detection at large distances of radiation pollution in the atmosphere and on the Earth’s surface is considered. The design of radar for determine of radioactive formations in the atmosphere and near the Earth surface is developed. [...]
2021 - 7 p. - Published in : J. Phys. : Conf. Ser. 1745 (2021) 012023 Fulltext: PDF;

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2021-03-31
06:26
Fiber optic quench detection for large-scale HTS magnets demonstrated on VIPER cable during high-fidelity testing at the SULTAN facility / Salazar, Erica E (MIT, Cambridge, CTP) ; Badcock, Rodney A (Victoria U., Wellington) ; Bajko, Marta (CERN) ; Castaldo, Bernardo (CERN) ; Davies, Mike (Victoria U., Wellington) ; Estrada, Jose (MIT, Cambridge, CTP) ; Fry, Vincent (MIT, Cambridge, CTP) ; Gonzales, Jofferson T (Victoria U., Wellington) ; Michael, Philip C (MIT, Cambridge, CTP) ; Segal, Michael (Unlisted, US, MA) et al.
Fiber-optic thermometry has the potential to provide rapid and reliable quench detection for emerging large-scale, high-field superconducting magnets fabricated with high-temperature-superconductor (HTS) cables. Developing non-voltage-based quench detection schemes, such as fiber Bragg grating (FBG) technology, are particularly important for applications such as magnetic fusion devices where a high degree of induced electromagnetic noise impose significant challenges on traditional voltage-based quench detection methods. [...]
2021 - 18 p. - Published in : Supercond. Sci. Technol. 34 (2021) 035027

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2021-03-26
12:11
Local beating corrections with orbit bumps in the LHC / Wolf, Dominik Werner
The purpose of this Master thesis is to explore further possibilities to increase the Luminosity of the Large Hadron Collider (LHC) by improving the optics correction [...]
CERN-THESIS-2021-024 - 104 p.

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