CERN Accelerating science

Accelerator Physics

Studies of Higher Order Mode Couplers for the Upgraded Travelling Wave Acceleration System in the CERN SPS / Kramer, Patrick (CERN)
Future high energy particle physics research based on accelerators requires high beam intensity. Parasitic interaction of the charged particle beam with its environment can deteriorate the beam quality and limit the peak intensity for which safe machine operation can be ensured. [...]
CERN-THESIS-2019-371.- 150 p. Fulltext: PDF; External link: Approve this document (restricted)

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Quench protection of the BabyIAXO magnet / Bykovskiy, N (CERN) ; Dudarev, A (CERN) ; Silva, H (CERN) ; ten Kate, H H J (CERN)
BabyIAXO, a 20 m-long twin-bore helioscope aiming for search of axion like particles, is currently in the engineering design phase and its construction is to be completed within the next 4 years. In addition to X-ray detectors and focusing optics, the system is equipped with a 50 MJ magnet with a common coil layout, containing two 10 m-long NbTi flat racetrack coils cooled by a group of cryocoolers. [...]
IOP, 2020 - 10 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012127 Fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012127

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Distribution Feedbox for the Superconducting Link (SCLink) and Magnets of HL-LHC / Bailey, W (Southampton U.) ; Pelegrin, J (Southampton U.) ; Falorio, I (Southampton U. ; CERN) ; Leclercq, Y (CERN) ; Betemps, R (CERN) ; Parma, V (CERN) ; Ballarino, A (CERN) ; Yang, Y (Southampton U.)
The High Luminosity LHC (HL-LHC) project aims at upgrading the LHC collider to increase its luminosity by about a factor of five. The electrical connection between the magnets in the LHC tunnel and the power converters in a new transverse tunnel will be supplied by a superconducting line (SCLink), consisting of ten MgB$_2$ cables housed into a 140 metre long flexible cryostat. [...]
IOP, 2020 - 9 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012076 Fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012076

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Thermal engineering of optical mirrors for use at cryogenic temperature inside a LHC magnet cryostat / Micolon, F (CERN) ; Dijoud, T (CERN) ; Durand, H Mainaud (CERN) ; Parma, V (CERN) ; Rude, V (CERN) ; Sosin, M (CERN)
In the frame of the HL-LHC project, innovative technical solutions are sought to measure accurately the position of the magnet helium vessel inside the cryostat. To this end, a system based on laser-interferometry is being designed to monitor the displacement of the vessel through dedicated openings in the new HL-LHC magnet cryostats. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012129 External link: Published fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012129

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Tuning the ultralow $β^*$ optics at the KEK Accelerator Test Facility 2 / Yang, R (CERN) ; Pastushenko, A (CERN ; Orsay) ; Aryshev, A (KEK, Tsukuba ; Sokendai, Tsukuba) ; Bergamaschi, M (CERN) ; Cilento, V (CERN ; Orsay) ; Faus-Golfe, A (Orsay) ; Fukuda, M (KEK, Tsukuba ; Sokendai, Tsukuba) ; Korysko, P (CERN) ; Kubo, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Kuroda, S (KEK, Tsukuba ; Sokendai, Tsukuba) et al.
For future linear colliders, a nanometer-scale beam size at the interaction point (IP) is one of the most challenging technical aspects. To explore the feasibility of a final focus system with a high chromaticity level, comparable to that of the Compact Linear Collider, the ultralow β* optics has been proposed and tuned at the KEK Accelerator Test Facility 2. [...]
2020 - 11 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 071003 Fulltext from publisher: PDF;

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Beam transfer function measurements used to probe the transverse Landau damping at the LHC / Tambasco, C (Ecole Polytechnique, Lausanne) ; Pieloni, T (Ecole Polytechnique, Lausanne) ; Barranco, J (Ecole Polytechnique, Lausanne) ; Buffat, X (CERN) ; Levens, T (CERN) ; Métral, E (CERN) ; Salvachua, B (CERN)
The Landau damping mechanism stabilizes the impedance driven head-tail modes in hadron synchrotrons. Because of the frequent coherent beam instabilities observed in the Large Hadron Collider in 2012, the Landau damping of the beams was doubted. [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 071002 Fulltext from publisher: PDF;

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Local observable for linear lattice imperfections in circular accelerators / Wegscheider, A (CERN ; Hamburg U.) ; Tomás, R (CERN)
Finding a truly local observable for perturbations of the linear beam dynamics is a nontrivial task, contrary to the nonlinear regime, where local resonance driving terms already exist. The phase beating between two locations depends on errors outside of this region. [...]
2020 - 12 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 054002 Fulltext from Publisher: PDF;

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FCC-hh Experimental Insertion Region Design / Abelleira, JoséL. (JAI, UK) ; Appleby, Robert B. (Manchester U.) ; Arsenyev, Sergey (CERN) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Benedikt, Michael (CERN) ; Besana, Maria Ilaria (CERN) ; García, Oscar Blanco (Frascati) ; Boscolo, Manuela (Frascati) ; Boutin, David (IRFU, Saclay) ; Buffat, Xavier (CERN) et al.
The Future Circular Collider study is exploring possible designs of circular colliders for the post-LHC era, as recommended by the European Strategy Group for High Energy Physics. [...]
- 74 p.

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Longitudinal and transverse mode coupling instability: Vlasov solvers and tracking codes / Métral, E (CERN) ; Migliorati, M (U. Rome La Sapienza (main) ; INFN, Rome)
The study of collective effects in circular accelerators can be tackled by solving numerically the Vlasov equation or by using tracking codes. The two methods are obtained with different approaches: Vlasov solvers consider a continuous distribution function and describe the beam with coherent oscillation modes in frequency domain (ending up usually with an eigenvalue system to solve), while tracking codes use macroparticles and wakefields in time domain. [...]
2020 - 16 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 071001 Fulltext from Publisher: PDF;

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TT20 Transport and Splitting of Beams Extracted Using Crystal Shadowing in LSS2 of the SPS / Arrutia Sota, Pablo Andreas (University of London (GB)) ; Dutheil, Yann (CERN) ; Fraser, Matthew Alexander (CERN) ; Velotti, Francesco Maria (CERN)
The CERN Super Proton Synchrotron (SPS) is employed to supply slow extracted beams to fixed target experiments located in CERN’s North Area [...]
- 2020. - 17 p.
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