Michel Bon-Mardion

Université Grenoble Alpes

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B. Rousset

CEA Grenoble

Alain Girard

CEA Grenoble

P. Bonnay

CEA Grenoble

C. Baudet

Laboratoire des Écoulements Géophysiques et Industriels

Jean-Paul Moro

CEA Grenoble

F. Michel

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

B. Lagier

CEA Grenoble

Christine Hoa

ITER

Pascal Roussel

Université d'Artois

Jean‐Marc Poncet

Université de Caen Normandie

Cooperative Institutions

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA Grenoble

Centre National de la Recherche Scientifique

Université Grenoble Alpes

Université Joseph Fourier

Institut Nanosciences et Cryogénie

CEA Paris-Saclay

Département des Systèmes Basses Températures

Service de Physique de l'État Condensé

Université Claude Bernard Lyon 1

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ITER cryogenic system validation tests at helios test facility

AIP conference proceedings (2012)

Roser Vallcorba-Carbonell B. Rousset Jean‐Marc Poncet Hyun-Sik Chang A. Forgeas

The ITER cryogenic system will have to cope with substantial dynamic heat loads due to the magnetic field variation and the production of neutrons generated by the fusion reactions.This will induce large pressure variations in the primary cooling loop of the superconducting coils, which results in the large power variation to the helium refrigerator.The HELIOS test facility, developed at CEA-Grenoble, and initially designed to study the pulse mitigation of the JT-60SA central solenoid cooling circuit (in order to smooth the pulsed load and test components), was adapted to the ITER cooling loop requirements.This paper presents the experimental results concerning the specific ITER analysis.We reproduce experimentally the pressure variation of the Central Solenoid (CS) loop predicted by a numerical model, and observe the behaviour of the circulating pump in these conditions.The investigations of the heat load smoothing methods, using the circuit of Toroidal Field Structures, such as the pulse mitigation by temporary by-pass of the flow of the Structure cooling loop, and variation of the speed of the cold circulating pump, are also presented.

Solenoid

Cryogenics

Fusion power

10.1063/1.4707068

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A Simulink Library of cryogenic components to automatically generate control schemes for large Cryorefrigerators

IOP Conference Series Materials Science and Engineering (2015)

François Bonne Mazen Alamir Christine Hoa P. Bonnay Michel Bon-Mardion

In this article, we present a new Simulink library of cryogenics components (such as valve, phase separator, mixer, heat exchanger...) to assemble to generate model-based control schemes. Every component is described by its algebraic or differential equation and can be assembled with others to build the dynamical model of a complete refrigerator or the model of a subpart of it. The obtained model can be used to automatically design advanced model based control scheme. It also can be used to design a model based PI controller. Advanced control schemes aim to replace classical user experience designed approaches usually based on many independent PI controllers. This is particularly useful in the case where cryoplants are submitted to large pulsed thermal loads, expected to take place in future fusion reactors such as those expected in the cryogenic cooling systems of the International Thermonuclear Experimental Reactor (ITER) or the Japan Torus-60 Super Advanced Fusion Experiment (JT- 60SA). The paper gives the example of the generation of the dynamical model of the 400W@1.8K refrigerator and shows how to build a Constrained Model Predictive Control for it. Based on the scheme, experimental results will be given. This work is being supported by the French national research agency (ANR) through the ANR-13-SEED-0005 CRYOGREEN program.

Thermonuclear Fusion

10.1088/1757-899x/101/1/012171

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Citations (12)

Search for an Experimental Signature of Quantum Turbulence in Velocity Spectra

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Julien Salort Francesca Chillà E. Rusaouën P.-E. Roche Mathieu Gibert

Signature (topology)

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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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Citations (3)

Caractérisation expérimentale de l'échangeur He II/ He II du dipôle D2 du projet HL-LHC au CERN

B. Rousset Florian Bancel N. Besson Michel Bon-Mardion Thomas Goy

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Scaling Laws and Intermittency in Cryogenic Turbulence Using SHREK Experiment

Springer proceedings in physics (2019)

Swapnil Kharche Michel Bon-Mardion Jean-Paul Moro Joachim Peinke B. Rousset

Intermittency

10.1007/978-3-030-22196-6_28

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Citations (1)

Local velocity measurements in the Shrek experiment at high reynolds number

C. Baudet Michel Bon-Mardion P. Bonnay Alan Braslau Bernard Castaing

We report preliminary results obtained using new local velocity probes in the Superfluid Helium high REynold number von Karman flow (SHREK) experiment for different forcing conditions. The presentation will focus on the validation of the signals obtained from a hot-wire and a total head pressure tube in both normal and superfluid phases of liquid helium.

Forcing (mathematics)

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Investigations of pulsed heat loads on a forced flow supercritical helium loop – Part A: Experimental set up

Cryogenics (2012)

C. Hoa Michel Bon-Mardion P. Bonnay P. Charvin Jean-Noel Cheynel

Cryogenics

Instrumentation

Solenoid

10.1016/j.cryogenics.2012.02.004

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Citations (36)

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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Citations (2)

Forced flow supercritical helium in a closed heat transfer loop subjected to pulsed heat loads

AIP conference proceedings (2012)

Christine Hoa P. Bonnay Michel Bon-Mardion P. Charvin Jean-Noel Cheynel

The superconducting magnets of the tokamak JT-60SA are cooled by means of forced flows of supercritical helium at 4.4 K and 0.5 MPa. The closed loops transfer heat from the magnets to the refrigerator through heat exchangers immersed into a saturated liquid helium bath. An experimental loop was designed to represent a 1/20 scaled down mock-up of JT-60SA central solenoid cooling circuits. This design for keeping the same transit times in the helium circuits, aims at observing the thermally induced transients in the closed loop. Indeed, heated section simulates the variable loads coming from the magnet circuits. A series of experiments was performed with pulsed loads in an isochoric configuration of the loop. The cold circulator has been characterized under pulsed operation and its performances are addressed. Mass flow regulations at the interface of the refrigerator were tested to smooth the pulsed loads with the saturated liquid bath acting as a thermal buffer. Knowledge of the pulsed loads effects on the cryogenic components is important in view of a safe operation of the cryogenic system.

Cryogenics

Solenoid

Solenoid valve

10.1063/1.4707133

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Citations (8)