CERN Accelerating science

Accelerator Physics

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2020-08-08
06:10
IFJ PAN’s contribution to the HL-LHC: DQW crab cavity preparation and testing at CERN / Zwoźniak, A (Cracow, INP ; CERN) ; Bocian, D (Cracow, INP) ; Krawczyk, A (Cracow, INP ; CERN) ; Prochal, B (Cracow, INP ; CERN) ; Wartak, M (Cracow, INP ; CERN)
The Double Quarter Wave (DQW) Crab Cavity was designed to rotate the colliding bunches and in consequence to increase the luminosity of the LHC machine. Prior to launching series production detailed RF validation tests, both without and with beam, were performed at CERN. [...]
SPIE, 2019 - 6 p. - Published in : Proc. SPIE 11054 (2019) 110540D

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2020-08-08
06:10
IFJ PAN’s contribution to the HL-LHC: crab cavities and RF / Krawczyk, A (Cracow, INP ; CERN) ; Bocian, D (Cracow, INP) ; Prochal, B (Cracow, INP ; CERN) ; Wartak, M (Cracow, INP ; CERN) ; Zwoźniak, A (Cracow, INP ; CERN)
The High Luminosity LHC (HL-LHC) Project is an upgrade program of the Large Hadron Collider (LHC) at CERN, focused on increasing the luminosity, thus significantly enhancing the potential to discover new physics from rare events. Among many activities ongoing in this framework, the implementation of novel superconducting radio frequency (SRF) cavities - especially Crab Cavities - is foreseen for compensation of the bunch crossing angle, which is a reducing factor for LHC luminosity. [...]
SPIE, 2019 - 8 p. - Published in : Proc. SPIE 11054 (2019) 110540C

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2020-08-08
06:10
IFJ PAN's contribution to the HL-LHC: construction of the superconducting links / Prochal, B (Cracow, INP ; CERN) ; Bocian, D (Cracow, INP) ; Krawczyk, A (Cracow, INP ; CERN) ; Zwoźniak, A (Cracow, INP ; CERN)
New superconducting transfer lines known as Superconducting Links (SC Links) are being developed at CERN for the remote powering of upgraded superconducting insertion magnets in the framework of the High Luminosity Large Hadron Collider (HL-LHC) project. The purpose of the SC Links is to transfer current from power converters located in radiation-free areas to magnets located in the vicinity of the LHC interaction points via shorter REBCO High Temperature Superconductor (HTS) current leads. [...]
SPIE, 2019 - 8 p. - Published in : Proc. SPIE 11054 (2019) 110540B

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2020-08-04
11:38
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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2020-08-02
06:17
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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2020-08-02
06:17
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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2020-07-31
10:26
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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2020-07-29
07:10
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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2020-07-29
07:10
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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2020-07-29
07:10
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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