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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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Millimeter-Wave WISP Search with Coherent Light-Shining-Through-a-Wall Toward the STAX Project
/ Miyazaki, Akira (Uppsala U.) ; Lofnes, Tor (Uppsala U.) ; Caspers, Fritz (Uppsala U. ; CERN) ; Spagnolo, Paolo (Uppsala U.) ; Jelonnek, John (Uppsala U. ; KIT, Karlsruhe) ; Ruess, Tobias (Uppsala U. ; KIT, Karlsruhe) ; Steinmann, Johannes L. (Uppsala U. ; KIT, Karlsruhe) ; Thumm, Manfred (Uppsala U. ; KIT, Karlsruhe)
A dark photon is one of the simplest extensions of the Standard Model of particle physics and can be a dark matter candidate. Dark photons kinetically mix with ordinary photons. [...]
arXiv:2212.01139.-
2024-01-01 - 15 p.
- Published in : Ann. Phys. (Leipzig) 536 (2024) 2200619
Fulltext: 2212.01139 - PDF; document - PDF;
In : 17th Workshop on Axions, WIMPs and WISPs (PATRAS 2022), Mainz, Germany, 8 - 12 Aug 2022, pp.2200619
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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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Development of a diagonal-cut type beam position monitor for the booster ring in the High Intensity Heavy-Ion Accelerator Facility project
/ Du, Ze (Lanzhou, Inst. Modern Phys.) ; He, Peilin (Lanzhou, Inst. Modern Phys.) ; Zhu, Guangyu (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Caspers, Fritz (CERN) ; Li, Zhixue (Lanzhou, Inst. Modern Phys.) ; Wu, Junxia (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Hu, Xuejing (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Zhang, Zhaolong (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Xie, Hongming (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Ni, Fafu (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) et al.
A diagonal-cut type beam position monitor (BPM) has been developed for the High Intensity Heavy-Ion Accelerator Facility (HIAF) project at the Institute of Modern Physics. Compared with other types of BPMs, the diagonal-cut type BPM has almost perfect position linearity, i.e., no non-linear correction required, which is advantageous for beams that are transversally large and have a complex charge distribution. [...]
2022 - 8 p.
- Published in : Rev. Sci. Instrum. 93 (2022) 043306
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Detailed Electromagnetic Characterisation of HL-LHC Low Impedance Collimators
/ Kurtulus, Adnan (CERN ; ETH, Zurich (main)) ; Accentura, Carlotta (CERN) ; Biancacci, Nicolo (CERN) ; Carra, Federico (CERN) ; Caspers, Fritz (CERN) ; Chitnis, Ninad (CERN) ; Giordano, Francesco (CERN) ; Illan Fiastre, Ricardo (CERN) ; Joly, Sébastien (CERN) ; Lamas Garcia, Inigo (CERN) et al.
The High Luminosity Large Hadron Collider (HL-LHC) project will upgrade the LHC machine to allow operation with increased luminosity for the experiments. In order to achieve this goal, different operational parameters of the machine need to be pushed beyond the present design values, including the stored beam energy. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 4258-4261
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4258-4261
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Shielded Pair Method for Cylindrical Surface Resistance Measurement at Cryogenic Temperature
/ Brunner, Kristóf (CERN ; Wigner RCP, Budapest) ; Barna, Daniel (Wigner RCP, Budapest) ; Calatroni, Sergio (CERN) ; Caspers, Fritz (CERN)
The shielded pair resonator method was already used in the past at CERN to measure the surface resistivity of the LHC beam screen both at room temperature and cryogenic temperature. We have refined and adapted the measurement to be able to measure other types of beam screens and also to operate in a strong dipolar magnetic field. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1132-1135
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1132-1135
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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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