N Besson

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Thomas Goy

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

F. Millet

CEA Grenoble

P Nivelon

CEA Grenoble

Florian Bancel

CEA Grenoble

B. Rousset

CEA Grenoble

S. Claudet

European Organization for Nuclear Research

Michel Bon-Mardion

Université Grenoble Alpes

A. Perin

European Organization for Nuclear Research

M. Bon Mardion

CEA Grenoble

P. Bonnay

CEA Grenoble

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Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA Grenoble

Département des Systèmes Basses Températures

Université Grenoble Alpes

Institut Nanosciences et Cryogénie

Université Joseph Fourier

European Organization for Nuclear Research

Fermi National Accelerator Laboratory

Institut de Recherche Interdisciplinaire de Grenoble

Centre National de la Recherche Scientifique

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Echangeurs He II/ He II HX-D2 pour les aimants D2 du HL-LHC Bilan

Florian Bancel N Besson M. Bon Mardion P. Bonnay Thomas Goy

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Cryogenic performances of a heat exchanger prototype suitable for the superconducting HL-LHC recombination dipole D2

IOP Conference Series Materials Science and Engineering (2022)

B. Rousset Florian Bancel N Besson Michel Bon-Mardion S. Claudet

Abstract In the framework of the future High Luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN, most superconducting magnets in the Long Straight Sections will be replaced. Among them, the new D2 recombination dipole will be a He II conduction-cooled magnet with a larger aperture than the LHC dipoles. To provide the required cooling (up to 70 W) to the D2 and to comply with its cryostat integration constraints, a compact heat exchanger was designed by the CEA Département des Systèmes Basses Températures (DSBT) based on a CERN preliminary analysis and a CEA review of the possible cooling schemes. This heat exchanger provides the required heat transfer between the He II pressurized bath and the He II saturated bath to cool the D2 magnet in different operating conditions at 1.8 K and 2 K. The detailed design of the heat exchanger was defined and one prototype was manufactured by industry under the CEA supervision. The heat exchanger prototype is composed of roughly one hundred oxygen-free high purity copper tubes, electron beam welded to the stainless steel He II bath enclosure. The present paper describes the successful cryogenic performance tests of the prototype of the D2 heat exchanger measured in the CEA 400W@1.8K test facility in Grenoble.

Cryostat

10.1088/1757-899x/1240/1/012120

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Assessment of the operation safety margin of the HL-LHC superconducting recombination Dipole D2 in case of helium filling failure

IOP Conference Series Materials Science and Engineering (2022)

B. Rousset Florian Bancel N Besson Michel Bon-Mardion S. Claudet

Abstract After the successful completion of the cryogenic performance tests of the He II heat exchanger prototype for the D2 recombination dipole of the future HL-LHC project at CERN, specific measurements were performed to determine the operation safety margin in case of abnormal operating conditions. This is particularly relevant in case of the failure of liquid helium supply in the He II cold source. For nominal operation, the liquid level is regulated at a constant value and it is not necessary to know its value very accurately. However, in case of a partial drying of the heat exchanger due to discontinuation of the helium liquid supply, it is essential to monitor the absolute value of the liquid level to anticipate any cooling malfunction. This paper describes the procedure for an accurate in-situ He II level measurement as well as for the heat loss and mass flow rate estimates in a He II phase separator. The operation safety margins of the He II heat exchanger prototype for the D2 magnet are then analyzed for the different operating conditions considered during the HL-LHC runs in case of non-nominal liquid level in the He II cold source.

10.1088/1757-899x/1240/1/012121

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