CERN Accelerating science

LHC

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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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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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2020-07-31
10:26
Preliminary conceptual design of FCC-hh cryo-refrigerators: Air Liquide Study / Tavian, L (CERN) ; Millet, F (CEA-DTA-LETI, Grenoble) ; Roig, M (Air Liquide, Sassenage) ; Zick, G (Air Liquide, Sassenage) ; Bernhardt, JM (Air Liquide, Sassenage)
In the framework of a world-wide international collaboration, the FCC-hh, a 100 TeV hadron collider in a 100-km long tunnel, is proposed as a future circular collider beyond LHC at CERN offering the broadest discovery potential at the energy frontier. For such high performance hadron collider, the cryogenic system has to distribute very large cooling capacities all along the 100-km tunnel for the superconducting magnets continuously cooled at 1.9 K and for the beam screens operated between 40 and 60 K. [...]
IOP, 2020 - 7 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 755 (2020) 012085
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Hartford, Connecticut, 21 - 25 Jul 2019, pp.012085

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2020-07-29
07:10
Reliability Analysis of Ethernet-Based Solutions for Data Transmission in the CERN Radiation Environment / Gnemmi, G (CERN) ; Tsiligiannis, G (CERN) ; Masi, A (CERN) ; Danzeca, S (CERN)
The necessity for a radiation-tolerant communication link, compatible with a wide range of devices, has prompted the study of different solutions than those currently employed at CERN. With Ethernet being one of the most established communication protocols for commercial and industrial applications, most of the efforts were concentrated toward that direction. [...]
2020 - 9 p. - Published in : IEEE Trans. Nucl. Sci. 67 (2020) 1614-1622

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2020-07-29
07:10
The Pion Single-Event Effect Resonance and its Impact in an Accelerator Environment / Coronetti, Andrea (CERN) ; García Alía, Rubén (CERN) ; Cecchetto, Matteo (CERN) ; Hajdas, Wojtek (PSI, Villigen) ; Söderström, Daniel (Jyvaskyla U.) ; Javanainen, Arto (Jyvaskyla U.) ; Saigné, Frédéric (Montpellier U.)
The pion resonance in the nuclear reaction cross section is seen to have a direct impact on the single-event effect (SEE) cross section of modern electronic devices. This was experimentally observed for single-event upsets and single-event latchup. [...]
2020 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 67 (2020) 1606-1613 Fulltext from publisher: PDF;

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