CERN Accelerating science

Accelerator Physics

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2022-05-11
06:13
M2 Experimental Beamline Optics Studies for Next Generation Muon Beam Experiments at CERN / Banerjee, Dipanwita (CERN) ; Bernhard, Johannes (CERN) ; Brugger, Markus (CERN) ; Charitonidis, Nikolaos (CERN) ; D'Alessandro, Gian Luigi (CERN ; JAI, UK) ; Gatignon, Laurent (CERN) ; Gerbershagen, Alexander (CERN) ; Montbarbon, Eva (CERN) ; Mussolini, Carlo Alberto (CERN ; JAI, UK) ; Parozzi, Elisabetta (CERN ; Milan Bicocca U. ; INFN, Milan Bicocca) et al.
In the context of the Physics Beyond Colliders Project, various new experiments have been proposed for the M2 beamline at the CERN North Area fixed target experimental facility. The experiments include MUonE, NA64µ, and the successor to the COMPASS experiment, tentatively named AMBER/NA66. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4041-4044 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4041-4044

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2022-05-06
12:44
First Studies of the Halo Collimation Needs in the FCC-ee / Moudgalya, Maitreyee
The Future Circular Collider, FCC-ee, is an electron-positron collider that is currently being studied and is designed to be the highest-luminosity high-energy lepton collider to date [...]
CERN-THESIS-2021-326 - 79 p.


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2022-05-05
15:29
Optics Measurement and Correction Strategies for HL-LHC / Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (CERN) ; Fuster Martinez, Nuria ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
The baseline strategy for optics commissioning in the HL-LHC era is presented and reviewed in detail, along with recent developments and unsolved matters in the linear and nonlinear optics measurement and correction techniques..
CERN-ACC-2022-0004.
- 2022. - 102 p.

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2022-05-04
08:54
Unsupervised Learning Techniques for Tune Cleaning Measurement / García Morales, Hector (Oxford U.) ; Fol, Elena (CERN) ; Tomás García, Rogelio (CERN)
Precise measurements of tune and its stability are crucial for various optics analyses in the LHC, e.g. for the determination of the beta star using K-modulation. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 624-627 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.624-627

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2022-05-04
08:54
Evolution of the LHC Beam Screen Surface Conditioning Upon Electron Irradiation / Bilgen, Suheyla (IJCLab, Orsay) ; Baglin, Vincent (CERN) ; Della-Negra, Serge (IJCLab, Orsay) ; Jacquet, Dominique (IJCLab, Orsay) ; Mercier, Bruno (IJCLab, Orsay) ; Ribaud, Isabelle (IJCLab, Orsay) ; Sattonnay, Gaël (IJCLab, Orsay)
For the vacuum scientists and the accelerator community, finding solutions to mitigate pressure rises induced by electron, photon, and ion desorption, and also beam instabilities induced by ion and electron clouds is a major issue. Moreover, it is worth noting that the OFE copper beam screen of the LHC is initially cleaned with standard industrial processes, leading to residual chemical contamination. [...]
Geneva : JACoW, 2021 - 3 p. - Published in : JACoW IPAC 2021 (2021) 4370-4372 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4370-4372

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2022-05-03
06:00
Dump Line Layout and Beam Dilution Pattern Optimization of the Future Circular Collider / Facskó, Benedek (Wigner RCP, Budapest) ; Barna, Daniel (Wigner RCP, Budapest) ; Lechner, Anton (CERN) ; Renner, Elisabeth (CERN)
To avoid any damage to the beam dump target in the Future Circular Collider, the beam will be swept over its surface using oscillating kickers in the x/y planes with a 90-degree phase difference, and an amplitude changing in time, creating a spiral pattern. The ideal pattern must have an increasing spiral pitch towards smaller radii to produce an even energy deposition density. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3815-3818 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3815-3818

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2022-04-29
04:25
Impedance modelling and collective effects in the Future Circular e$^+$e$^-$ Collider with 4 IPs / Migliorati, M. (U. Rome La Sapienza (main) ; INFN, Rome) ; Antuono, C. (INFN, Rome ; U. Rome La Sapienza (main) ; CERN) ; Carideo, E. (U. Rome La Sapienza (main) ; INFN, Rome ; CERN) ; Zhang, Y. (Beijing, Inst. High Energy Phys.) ; Zobov, M. (LNF, Dafne Light)
The FCC-ee impedance model is being constantly updated closely following the vacuum chamber design and parameters evolution. [...]
arXiv:2204.04616.
- 16 p.
Fulltext

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2022-04-26
16:37
Tunability Study of the Ultra-Low β* Optics at ATF2 with New Octupole Setup and Tuning Knobs / Pastushenko, Andrii (CERN ; IJCLab, Orsay) ; Faus-Golfe, Ángeles (IJCLab, Orsay) ; Kubo, Kiyoshi (KEK, Tsukuba) ; Kuroda, Shigeru (KEK, Tsukuba) ; Naito, Takashi (KEK, Tsukuba) ; Okugi, Toshiyuki (KEK, Tsukuba) ; Terunuma, Nobuhiro (KEK, Tsukuba) ; Tomás García, Rogelio (CERN) ; Yang, Renjun (KEK, Tsukuba)
The main goal of the Accelerator Test Facility 2 (ATF2) is to demonstrate the feasibility of future linear colliders’ final focus systems. The Ultra-low β^{*} optics of ATF2 is designed to have the same chromaticity level as CLIC. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 752-755 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.752-755

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2022-04-26
06:27
Impact of Bunch Current on Optics Measurements in SuperKEKB / Keintzel, Jacqueline (CERN ; TU Vienna) ; Ishibashi, Takuya (KEK, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Mitsuka, Gaku (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Sugimoto, Hiroshi (KEK, Tsukuba) ; Terui, Shinji (KEK, Tsukuba) ; Tobiyama, Makoto (KEK, Tsukuba) et al.
SuperKEKB has recently achieved the world record instantaneous luminosity of 2.8 × 10³⁴ \si{cm⁻²s⁻¹} and aims at reaching a target luminosity of about 6 × 10³⁵ \si{cm⁻²s⁻¹}. To accomplish this goal it is planned to increase beam currents up to §I{3.6}{A} and §I{2.6}{A} for the positron and the electron ring, respectively. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1356-1359 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1356-1359

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2022-04-22
11:27
SuperKEKB Optics Measurements Using Turn-by-Turn Beam Position Data / Keintzel, Jacqueline (CERN ; TU Vienna) ; Koiso, Haruyo (KEK, Tsukuba) ; Mitsuka, Gaku (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Sugimoto, Hiroshi (KEK, Tsukuba) ; Tobiyama, Makoto (KEK, Tsukuba) ; Tomás García, Rogelio (CERN) ; Yang, Renjun (KEK, Tsukuba)
SuperKEKB, an asymmetric electron-positron collider, has recently achieved the world record instantaneous luminosity of 2.8 × 10³⁴ \si{cm⁻²s⁻¹} using crab-waist collision scheme. In order to reach the design value of 6×10³⁵ \si{cm⁻²s⁻¹} a vertical beta function at the interaction point of §I{0.3}{mm} is required, demanding unprecedented optics control. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1352-1355 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1352-1355

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