Measurement of the thermal properties of prototype lambda plates for the LHC

Marie, Rodolphe; Metral, L.; Perin, Antonio; Rieubland, J. M.

doi:10.1016/b978-008044559-5/50249-0

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…All busbars are connected by low temperature brazing on one side to the current leads cables and on the other side to the magnets busbars. Because the design pressure of the magnets (20 bar) and of the DFBs (3.5 bar) are different, specially developed hydraulic separation plugs are installed on the busbars [7]. In the case of the DFBAs the plug also acts as a lambda plate between the 1.9 K superfluid helium volume and the 4.5 K helium bath of the DFBs.…”

Section: Current Leads and Busbarsmentioning

confidence: 99%

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Design, Production and First Commissioning Results of the Electrical Feedboxes of the LHC

Perin¹,

Atieh²,

Benda³

et al. 2008

AIP Conference Proceedings

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A total of 44 CERN designed cryogenic electrical feedboxes are needed to power the LHC superconducting magnets. The feedboxes include more than 1000 superconducting circuits fed by high temperature superconductor and conventional current leads ranging from 120 A to 13 kA. In addition to providing the electrical current to the superconducting circuits, they also ensure specific mechanical and cryogenic functions for the LHC. The paper focuses on the main design aspects and related production operations and gives an overview of specific ABSTRACTA total of 44 CERN designed cryogenic electrical feedboxes are needed to power the LHC superconducting magnets. The feedboxes include more than 1000 superconducting circuits fed by high temperature superconductor and conventional current leads ranging from 120 A to 13 kA. In addition to providing the electrical current to the superconducting circuits, they also ensure specific mechanical and cryogenic functions for the LHC. The paper focuses on the main design aspects and related production operations and gives an overview of specific technologies employed. Results of the commissioning of the feedboxes of the first LHC sectors are presented.

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Section: Current Leads and Busbarsmentioning

confidence: 99%

“…To obtain the required performance and robustness in case of thermal excursions, the busbars are bonded to a polymer plug with an epoxy resin. The seal between the plug and the busbar duct is realized by pressing the specially shaped plug onto a finely machined stainless steel flange [7].…”

Section: Current Leads and Busbarsmentioning

confidence: 99%

Design, Production and First Commissioning Results of the Electrical Feedboxes of the LHC

Perin¹,

Atieh²,

Benda³

et al. 2008

AIP Conference Proceedings

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“…The design pressures are 22 bar for the thermal shield lines and 20 bar for the superconducting cable lines. The cable carrying lines are separated from the current feed boxes and magnet cold masses respectively by helium tight plugs, withstanding 20 bar [5].…”

Section: Mechanical Characteristicsmentioning

confidence: 99%

Commissioning and First Operation of Superconducting Links at the Large Hadron Collider (Lhc)

Weelderen¹,

Goiffon²,

Perin³

et al. 2010

AIP Conference Proceedings

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The Large Hadron Collider (LHC) now under commissioning at CERN is a 26.7 km collider based on several thousand high-field superconducting magnets, the majority of which operating in superfluid helium below 2 K and some isolated magnets operating in normal helium at 4.5 K. Four superconducting links (DSLs) of about 76 m in length and one of about 517 m in length, were designed, constructed and installed over a three year period. Their purpose is to transport current over long distances whenever underground LHC space constraints prevents to put power converters, current feed boxes and magnets in each others' proximity. The four 76 m long DSLs transport current between current feed boxes and several of the isolated magnets, whereas the 517 m long DSL transports current between two current feed boxes. The links are comprised of cryogenic, vacuum-insulated, transfer lines housing one or more superconducting cables. The operating temperatures are about 5 K for the DSL part that houses the cable and about 60 K for the heat shield. Their commissioning and performance results at first operational experience in the beginning of 2008 are discussed.

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Conceptual study of the cryostats for the cold powering system for the triplets of the High Luminosity LHC

Ballarino

Giannelli

Jacquemod

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Abstract. The High Luminosity LHC (HL-LHC) is a project aiming to upgrade the Large Hadron Collider (LHC) after 2020-2025 in order to increase the integrated luminosity by about one order of magnitude and extend the operational capabilities until 2035. The upgrade of the focusing triplet insertions for the Atlas and CMS experiments foresees using superconducting magnets operating in a pressurised superfluid helium bath at 1.9 K. The increased radiation levels from the particle debris produced by particle collisions in the experiments require that the power converters are placed in radiation shielded zones located in a service gallery adjacent to the main tunnel. The powering of the magnets from the gallery is achieved by means of MgB2 superconducting cables in a 100-m long flexible cryostat transfer line, actively cooled by 4.5 K to 20 K gaseous helium generated close to the magnets. At the highest temperature end, the helium flow cools the High Temperature Superconducting (HTS) current leads before being recovered at room temperature. At the magnet connection side, a dedicated connection box allows connection to the magnets and a controlled boil-off production of helium for the cooling needs of the powering system. This paper presents the overall concept of the cryostat system from the magnet connection boxes, through the flexible cryostat transfer line, to the connection box of the current leads. IntroductionThe principal part of the High Luminosity Large Hadron Collider (HL-LHC) project [1] requires the installation of new triplet insertions focusing the beams at each side of the Atlas and CMS interaction points. Due to increasing intensity and luminosity, the higher levels of radiation require shielding of the power converters by installing them in a newly dug parallel gallery. The powering of the triplet insertion magnets is performed via a flexible superconducting line (hereafter called "SC link") about 100 meters long, connected to the magnets on one end and to the power converters on the other end through dedicated connection cryostats referred respectively in the LHC naming convention as DFX and DFH, see figure 1. The High Luminosity HL-LHC project [1] will include four of these SC links with DFH-DFX connection cryostats and will be installed in the LHC tunnel in 2024-2025. In this paper the main functions of the flexible line and the two connection cryostats are presented, the main challenge being to design a cooling scheme ensuring the superconducting state of the conductors with high reliability. Technical requirements requiring further detailed studies are listed and identified.The conceptual designs of the electrical, vacuum, cryogenic and mechanical layouts are described taking into account the specificities of maintainability and operation in an activated area. A specific

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Measurement of the thermal properties of prototype lambda plates for the LHC

Cited by 5 publications

References 2 publications

Design, Production and First Commissioning Results of the Electrical Feedboxes of the LHC

Design, Production and First Commissioning Results of the Electrical Feedboxes of the LHC

Commissioning and First Operation of Superconducting Links at the Large Hadron Collider (Lhc)

Conceptual study of the cryostats for the cold powering system for the triplets of the High Luminosity LHC

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