CERN Accelerating science

SPS and CNGS

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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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2020-08-04
06:57
Cryogenic Upgrade of the Helium Central Liquefier and Superconducting Cable & Wire Test Facilities at CERN / Pirotte, O (CERN) ; Lees, A (CERN) ; Barbe, T (CERN) ; Dupont, T (CERN) ; Pezzetti, M (CERN)
The demand for liquid helium (LHe) for users at CERN without dedicated cryogenic infrastructure is set to increase due to future projects and experiments in the Antiproton Decelerator. LHe is supplied to the users by means of 500 liter dewars filled by the central liquefier (B165) that comprises a cryogenic plant of 400 W @ 4.5 K. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012146 External link: Published fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012146

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2020-08-04
06:57
Impact of 440 GeV Proton beams on Superconductors in a Cryogenic Environment / Will, A (CERN ; KIT, Karlsruhe, IPE) ; Bernhard, A (KIT, Karlsruhe, IPE) ; Bonura, M (Geneva U.) ; Bordini, B (CERN) ; Mentink, M (CERN) ; Mueller, A S (KIT, Karlsruhe, IPE) ; Oslandsbotn, A (CERN) ; Schmidt, R (CERN) ; Schubert, J (CERN) ; Senatore, C (CERN ; Geneva U.) et al.
The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failures. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, through direct beam impact or via secondary particle showers. [...]
IOP, 2020 - 10 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012060 Published fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012060

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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
Design, Procurement, Installation and Commissioning of the Cryogenic Infrastructure for a New Superconducting RF Test Facility with Beam at CERN / Delprat, L (CERN) ; Brodzinski, K (CERN) ; Claudet, S (CERN) ; Derking, H (CERN)
The High-Luminosity LHC project (HL–LHC), aiming at peak luminosity above 5.0 × 10$^{34}$ cm$^{-2}$ s$^{-1}$, considers replacing the matching sections on both sides of the ATLAS and CMS experiments. To complement new focusing quadrupoles, this upgrade considers using the so-called superconducting crab cavities, never operated before with protons and therefore requiring qualification with beam. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012145 External link: Published Fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012145

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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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2020-07-31
10:26
Process control system evolution for the LHC Cold Compressors at CERN / Bradu, B (CERN) ; Delprat, L (CERN) ; Duret, E (CERN) ; Ferlin, G (CERN) ; Ivens, B (CERN) ; Lefebvre, V (CERN) ; Pezzetti, M (CERN)
The Large Hadron Collider (LHC) operates using superfluid helium provided by eight large refrigeration units (2.4 kW @ 1.8 K each). These units supplied by specialized cryogenic industrial suppliers are composed of serial hydrodynamic cold compressors based on an axial-centrifugal impeller coupled with volumetric warm screw compressors. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012086
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012086

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2020-07-29
07:10
Thermal Neutron-Induced SEUs in the LHC Accelerator Environment / Cecchetto, Matteo (CERN) ; García Alía, Rubén (CERN) ; Wrobel, Frédéric (IES, Montpellier) ; Tali, Maris (CERN) ; Stein, Oliver (CERN) ; Lerner, Giuseppe (CERN) ; Bilko, Kacper (CERN) ; Esposito, Luigi (CERN) ; Bahamonde Castro, Cristina (CERN) ; Kadi, Yacine (CERN) et al.
In addition to high-energy hadrons, which include neutrons, protons, and pions above 20 MeV, thermal neutrons (ThNs) are a major concern in terms of soft error rate (SER) for electronics operating in the large hadron collider (LHC) accelerator at the European Organization for Nuclear Research (CERN). Most of the electronic devices still contain Boron-10 inside their structure, which makes them sensitive to ThNs. [...]
2020 - 9 p. - Published in : IEEE Trans. Nucl. Sci. 67 (2020) 1412-1420 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
04:46
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. [...]
arXiv:2007.12058.
- 74 p.
Fulltext

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