CERN Accelerating science

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2022-07-30
06:24
A New Electron Cooler for the CERN Antiproton Decelerator (AD) / Tranquille, G (CERN) ; Cenede, J (CERN) ; Frassier, A (CERN) ; Chritin, N S (CERN) ; Coutron, Y M (CERN) ; Sinturel, A (CERN) ; Ferreira, J A (CERN) ; von Freeden, L (CERN) ; Bajas, H (CERN) ; Jorgensen, L V (CERN)
The current electron cooler at the Antiproton Decelerator (AD) at CERN was built in the second half of the 1970s and is thus well over 40 years old. It was built for the Initial Cooling Experiment (ICE) where stochastic and electron cooling were tested to ascertain the feasibility of using these techniques to generate high intensity antiproton beams for the SPpS. [...]
2021 - 3 p. - Published in : 10.18429/JACoW-COOL2021-P2004 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.95-97

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2022-07-26
06:23
AD/ELENA Electron Cooling Experience During and after CERNs Long Shutdown (LS2) / Gamba, Davide (CERN) ; Bojtár, Lajos (CERN) ; Carli, Christian (CERN) ; Dupuy, Bruno (CERN) ; Frassier, Alexandre (CERN) ; Jørgensen, Lars (CERN) ; Ponce, Laurette (CERN) ; Tranquille, Gerard (CERN)
Electron cooling is a key ingredient of the Antimatter Factory at CERN, now composed of the AD and ELENA rings, both featuring an electron cooler. After the successful commissioning of the ELENA ring and electron cooling with antiprotons in 2018, the facility was shut down for the CERN long shutdown (LS2). [...]
2021 - 6 p. - Published in : JACoW COOL 2021 (2021) 36-41 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.36-41

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2022-07-26
06:22
Recommissioning of the CERN AD Stochastic Cooling System in 2021 after Long Shutdown 2 / Höfle, Wolfgang (CERN) ; Carli, Christian (CERN) ; Caspers, Fritz (CERN) ; Dupuy, Bruno (CERN) ; Gamba, Davide (CERN) ; Louwerse, Reinier (CERN) ; Myklebust, Vebjorn Roed (CERN) ; Oliveira, Joao Carlos (CERN) ; Ponce, Laurette (CERN) ; Rey, Stephane (CERN) et al.
The power system of the Stochastic Cooling System of the anti-proton decelerator AD at CERN, installed on top of the shielding blocks of the AD ring, was completely dismantled during the long shutdown 2 (LS2) at the end of the 2018 run in order to gain access to the accelerator for magnet consolidation. At start-up, this required finding and verifying the correct delays for all 48 power amplifiers feeding to the two kickers by means of beam transfer functions for the two cooling plateaus at 3.57 GeV/c and 2 GeV/c. [...]
2021 - 6 p. - Published in : JACoW COOL 2021 (2021) 20-25 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.20-25

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2022-07-26
06:22
Optimization of the Electron Emission From Carbon Nanotubes for Electron Cooling in ELENA / Galante, B (CERN ; Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Tranquille, G A (CERN) ; Welsch, C P (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; López, J Resta (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech. ; Valencia U.)
Electron cooling is a process that guarantees beam quality in low energy antimatter facilities. In ELENA the electron cooler allows to reduce the emittance blow-up of the antiproton beam, thus delivering highly focused and bright beams at the unprecedented low energy of 100 keV to the experiments. [...]
2021 - 4 p. - Published in : JACoW COOL 2021 (2021) 85-88 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.85-88

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2022-07-17
06:27
Thermal Validation, Structural Implications and Redesign Proposals of the Multipurpose External Dump of the Proton Synchrotron at CERN / Pilan Zanoni, André (CERN) ; Calviani, Marco (CERN) ; Grenier-Boley, Edouard (CERN)
In order to safely absorb charged particle beams prepared for various experimental facilities at the European Organization for Nuclear Research (CERN) an external dump is installed at the end of the Proton Synchrotron (PS) transfer line. This dump currently consists of stacked cast iron blocks surrounded by concrete shielding. [...]
2019 - 9 p. - Published in : Heat Transfer Engineering 42 (2019) 319-327
In : 11th International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2018), Cracow, Poland, 21 - 24 May 2018, pp.319-327

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2022-07-07
17:56
Design, prototyping, and thermo-mechanical modelling of a neutron spallation target impacted by high-energy proton-beam pulses in the n_TOF facility at CERN / Esposito, Raffaele
This manuscript describes the design work and the R&D activities carried out for the third-generation neutron production target in the neutron Time-Of-Flight (n_TOF) facility at the European Laboratory for Particle Physics (CERN) [...]
CERN-THESIS-2022-080 - Lausanne : EPFL, 2022-06-20. - 142 p.


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2022-06-04
06:06
Phase advance constraint in $K$ modulation for precise $\beta$-function determination / Garcia-Morales, H (CERN) ; Hofer, M (CERN) ; Maclean, E H (CERN) ; van Riesen-Haupt, L (CERN) ; Tomás, R (CERN)
A precise determination of the β function at different locations of an accelerator is essential to allow accurate optics correction and to ensure high machine performance. The β function can only be measured directly at locations where beam position monitors are installed. [...]
2022 - 11 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 041002 Fulltext: PDF;

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2022-06-02
06:29
Barrier bucket gymnastics and transversely split proton beams: Performance at the CERN Proton and Super Proton Synchrotrons / Vadai, M (CERN ; Queen Mary, U. of London) ; Alomainy, A (Queen Mary, U. of London) ; Damerau, H (CERN) ; Giovannozzi, M (CERN) ; Huschauer, A (CERN)
During the 2018 proton run, a new radio-frequency beam manipulation has been studied and successfully implemented at the CERN Proton Synchrotron (PS) for the first time. This technique is used to deplete a well-defined fraction of a continuous longitudinal beam distribution by creating a so-called barrier bucket. [...]
2022 - 12 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 050101 Fulltext: PDF;

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2022-05-20
07:28
Manipulation of transverse emittances in circular accelerators by crossing non-linear 2D resonances / Bazzani, A. (Bologna U. ; INFN, Bologna) ; Capoani, F. (Bologna U. ; INFN, Bologna ; CERN) ; Giovannozzi, M. (CERN)
Controlling nonlinear effects in the transverse dynamics of charged particle beams in circular accelerators opens new possibilities for controlling some of the beam properties. Beam splitting by crossing a stable 1D nonlinear resonance is part of the routine operation of the CERN Proton Synchrotron. [...]
arXiv:2202.04559.- 2022-05-03 - 24 p. - Published in : Eur. Phys. J. Plus 137 (2022) 594 Fulltext: PDF; Publication: PDF;

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2022-04-29
09:54
Mesure de l’échauffement d’une cible "dump” interne / Henny, L
CERN-MPS-CO-70-5. - 1970. - 14 p.


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