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Experience with Beam Transfer Function Measurements for Setting-up the Stochastic Cooling System in the CERN Anti-Proton Decelerator (AD)
/ Rey, Stephane (CERN) ; Bastos, Wilker (CERN) ; Caspers, Fritz (CERN) ; Dupuy, Bruno (CERN) ; Gamba, Davide (CERN) ; Höfle, Wolfgang (CERN) ; Louwerse, Reinier (CERN)
Beam transfer function measurements have regularly been used to set-up the adjustable parameters for stochastic cooling systems. We report on the automation of these measurements at CERN that permit efficient set-up of the cooling loops in the anti-proton decelerator (AD) and enables insight into the bandwidth (nominal frequency range of 850 MHz to 1.7 GHz) of the overall system for the longitudinal, horizontal and vertical cooling at the two different beam momenta of 2 GeV/c and 3.5 GeV/c. [...]
2024 - 4 p.
- Published in : JACoW COOL 2023 (2024) THPOSRP22
Fulltext: PDF;
In : 14th International Workshop on Beam Cooling and Related Topics (COOL '23), Montreux, Switzerland, 8 - 13 Oct 2023, pp.THPOSRP22
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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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SPS MD5044: machine stability characterisation of Gamma Factory SPS Proof-of-Principle Experiment
/ Ramjiawan, Rebecca Louise (CERN) ; Bartosik, Hannes (CERN) ; Dutheil, Yann (CERN) ; Hofle, Wolfgang (CERN) ; Krasny, Mieczyslaw Witold (Centre National de la Recherche Scientifique (FR)) ; Martens, Aurelien (Université Paris-Saclay (FR)) ; Papaphilippou, Yannis (CERN) ; Petrenko, Alexey ; Velotti, Francesco Maria (CERN)
The Gamma Factory (GF) initiative proposes an innovative method of producing high-energy, high-intensity photon beams via the laser-excitation and subsequent decay of relativistic partially stripped ions stored in the CERN LHC. [...]
CERN-ACC-NOTE-2022-0014 ; CERN-PBC-Notes-2022-006.
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2022. - 16 p.
Full text
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Recommissioning of the CERN AD Stochastic Cooling System in 2021 after Long Shutdown 2
/ Hofle, Wolfgang (CERN) ; Oliveira, Joao Carlos (CERN) ; Carli, Christian (CERN) ; Caspers, Fritz (European Scientific Institute (FR)) ; Dupuy, Bruno (CERN) ; Gamba, Davide (CERN) ; Louwerse, Reinier (CERN) ; Ponce, Laurette (CERN) ; Myklebust, Vebjorn Roed ; Rey, Stephane Franck (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. [...]
CERN-ACC-Note-2022-0003 ; ISBN: 978-3-95450-243-1 ; ISSN: 2226-0374 ; doi: 10.18429/JACoW-COOL2021-S302.
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2022. - 6 p.
Access to fulltext
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Impedance localization and identification
/ Biancacci, N (CERN) ; Fernández, R Alemany (CERN) ; Alexahin, Y (Fermilab) ; Carlà, M (CERN) ; Eldred, J (Fermilab) ; Höfle, W (CERN) ; Huschauer, A (CERN) ; Levens, T (CERN) ; Malina, L (CERN) ; Métral, E (CERN) et al.
The beam coupling impedance represents one of the sources of potential beam instabilities in particle accelerators. The localization of large coupling impedance sources is therefore very important in order to focus the efforts for mitigation measures when these are needed. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.141
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.141 (CERN-2020-009)
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Injectors Beam Performance Evolution during Run 2
/ Bartosik, H (CERN) ; Albright, S (CERN) ; Alemany, R (CERN) ; Antoniou, F (CERN) ; Asvesta, F (CERN) ; Benedetto, E (CERN) ; Bellodi, G (CERN) ; Biancacci, N (CERN) ; Bohl, T (CERN) ; Cornelis, K (CERN) et al.
This contribution gives an overview of the beam performance of the LHC injector
chain during Run 2. In the first part the various beam types used for LHC
luminosity production with protons (e.g. [...]
2019 - 8 p.
- Published in : , pp. 51-58
Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.51-58
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ebook
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Intra-bunch feedback system developments at DAFNE
/ Drago, Alessandro (LNF, Dafne Light ; Rome U., Tor Vergata) ; Alesini, D. (LNF, Dafne Light) ; Caschera, S. (LNF, Dafne Light) ; Gallo, A. (LNF, Dafne Light) ; Fox, J.D. (SLAC) ; Cesaratto, J. (SLAC) ; Dusatko, J. (SLAC) ; Olsen, J. (SLAC) ; Rivetta, C. (SLAC) ; Turgut, O. (SLAC) et al.
This paper presents history and evolution of the intra-bunch feedback system for circular accelerators. This pro-ject has been presented by John D. [...]
arXiv:2004.11649.-
Geneva : CERN, 2020 - 5 p.
- Published in : 10.23732/CYRCP-2020-007.223
Fulltext: PDF; Fulltext from publisher: 1117-Article Text-4768-1-10-20200919 (1) - PDF; 1117-Article Text-4768-1-10-20200919 - PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.223 (CERN-2020-007)
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First Operation for Stochastic Cooling of P-Bars in the CERN AD Using Optical Delay Notch Filter and Plans 2021 Operation
/ Höfle, Wolfgang (CERN) ; Arnaudon, Luca (CERN) ; Bjørsvik, Endre (CERN) ; Caspers, Fritz (CERN) ; Eriksson, Tommy (CERN) ; Louwerse, Reinier (CERN) ; Myklebust, Vebjorn Roed (CERN)
As part of the consolidation of the stochastic coolingsystem of the CERN Antiproton Decelerator a notch filter with optical delay lines has been developed. During the 2018 run of AD a notch filter with optical delay lines for the longitudinal stochastic cooling at 3.5 GeV/c was successfully tested with beam for the first time. [...]
2019 - 5 p.
- Published in : 10.18429/JACoW-COOL2019-MOY01
Fulltext: 10.18429_JACoW-COOL2019-MOY01 - PDF; moy01 - PDF;
In : International Workshop on Beam Cooling and Related Topics, Novosibirsk, Russian Federation, September 23 - 27, 2019, pp.MOY01
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