CERN Accelerating science

LHC

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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
In : Superconductivity and Particle Accelerators 2018, Warsaw, Poland, 27 - 29 Nov 2018, pp.110540D

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2020-08-04
06:57
Design of the consolidated LHC dipole diode busbar insulation system / Meuter, F (CERN) ; Sahner, T (CERN) ; Scheuerlein, C (CERN) ; Tock, J Ph (CERN)
During the second long shutdown of the LHC in 2019 and 2020, the electrical insulation of the 1232 dipole diodes and diode busbars is presently consolidated. The newly designed insulation system, mainly consisting of polyimide laminated fiber reinforced epoxy sheets and injection molded pure resin inserts, can be installed in the very constricted space of the LHC tunnel, without removing the presently installed insulation. [...]
IOP, 2020 - 7 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012072 Published fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012072

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2020-08-04
06:57
Assembly and Test of the HL-LHC Twin Aperture Orbit Corrector Based on Canted Cos-Theta Design / Kirby, G (CERN) ; Van Nugteren, J (CERN) ; Mentink, M (CERN) ; Canale, M (CERN) ; Gentini, L (CERN) ; Mazet, J (CERN) ; Pincot, F O (CERN) ; Mangiarotti, F J (CERN) ; Fiscarelli, L (CERN) ; Steckert, J (CERN) et al.
In the frame of the high-luminosity upgrade project (HL-LHC) at CERN, a double aperture, independently powered, family of beam orbit corrector magnets will be installed close to the two main LHC experiments Atlas and CMS. These 2.6 T magnets, built using a canted cos-theta design. [...]
IOP, 2020 - 10 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012070 Published fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012070

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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
Analysis of short-circuit transients in the LHC main dipole circuit / Liakopoulou, A (CERN ; Twente U., Enschede) ; Annema, A J (Twente U., Enschede) ; Bortot, L (CERN ; Darmstadt, Tech. U.) ; Charifoulline, Z (CERN) ; Maciejewski, M (CERN) ; Prioli, M (INFN, Milan) ; Ravaioli, E (CERN) ; Salm, C (Twente U., Enschede) ; Schmitz, J (Twente U., Enschede) ; Verweij, A P (CERN)
After the occurrence and detection of a short circuit to ground in the LHC main dipole circuit, a fast power abort is triggered and the current in the circuit starts decaying semi-exponentially from a maximum value of 11.85 kA to zero, with a time constant of 103 s. If a short to ground occurs, the current flows through the fuse that is present in the grounding subcircuit. [...]
IOP, 2020 - 10 p. - Published in : J. Phys. : Conf. Ser. 1559 (2020) 012077 Fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012077

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2020-07-31
10:26
Experimental measurements on MLI performance from 20-60 K to 4.2 K / Venturi, V (Wroclaw Tech. U. ; CERN) ; Koettig, T (CERN) ; Chorowski, M (Wroclaw Tech. U.) ; Polinski, J (Wroclaw Tech. U.) ; Parma, V (CERN)
Future accelerators like the Future Circular Collider (FCC) under study at CERN, will be considerably larger than the Large Hadron Collider (LHC) presently in operation, with consequent increasing demands for cryogenically efficient cryostat solutions. MLI insulating systems remain the technology of choice for large accelerators due to the compromise they offer between thermal performance and cost-effectiveness. [...]
IOP, 2020 - 7 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012154 External link: Published Fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012154

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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
Thermo-Electric Design of the Protection and Diagnostic Feeders of the HL-LHC Triplets / Pasdeloup, F (CERN) ; Prin, H (CERN) ; Williams, L (CERN)
The HL-LHC Project currently undertaken by CERN that provides an upgrade to the existing LHC accelerator, is designed to increase the luminosity of the colliding particle bunches by a factor of at least five. Part of this upgrade will require the replacement of the existing groups of three superconducting LHC triplet magnets situated on each side of the ATLAS and CMS detectors with similar groups of four higher field HL-LHC triplet magnets of a new design that exploit coils manufactured with cables in Nb3Sn superconducting alloy. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012128 External link: Published fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012128

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2020-07-31
10:26
Cryogenic management of the LHC run 2 dynamic heat loads / Bradu, B (CERN) ; Brodzinski, K (CERN) ; Ferlin, G (CERN)
During the LHC (Large Hadron Collider) Run 2 between 2015 and 2018 inclusive, significant dynamic heat loads have been generated and successfully managed by the LHC cryogenic system. These dynamic heat loads are generated by several physical phenomena occurring at two temperature levels and with different time constants. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012099 External link: Published fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012099

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2020-07-31
10:26
Cryogenic operational experience from the LHC physics run2 (2015 – 2018 inclusive) / Brodzinski, K (CERN) ; Bradu, B (CERN) ; Delprat, L (CERN) ; Ferlin, G (CERN)
With end of year 2018 the LHC has completed its second physics run and started its second two-years long shut down period dedicated to planned consolidation, maintenance and upgrade activities. The run2 – four-year physics operation period started in spring 2015 – was used mainly for luminosity production but also to allow the optimization and adaptability of the cryogenic system capacity to compensate for generated operational heat loads. [...]
IOP, 2020 - 8 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012096 External link: Published fulltext
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012096

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