Christine Hoa

ITER

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François Bonne

CEA Grenoble

L. Zani

CEA Cadarache

Benoît Lacroix

CEA Cadarache

Jean‐Marc Poncet

Université de Caen Normandie

Quentin Le Coz

CEA Cadarache

F. Michel

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

A. Torre

CEA Cadarache

R. Vallcorba

Institut de Recherche sur les Lois Fondamentales de l'Univers

Nicolas Misiara

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Kamil Sedlák

State Veterinary Administration

Cooperative Institutions

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

CEA Grenoble

ITER

National Institutes for Quantum and Radiological Science and Technology

Université Grenoble Alpes

CEA Cadarache

Institut Nanosciences et Cryogénie

Université Joseph Fourier

CEA Paris-Saclay

Japan Atomic Energy Agency

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Updates on Magnet Design For EU-DEMO Reactor: Optimization Studies on TF and CS Systems

IEEE Transactions on Applied Superconductivity (2021)

L. Zani François Bonne V. Corato Q. Le Coz B Aguiar Jose

In the framework of EU design activities for dimensioning the future fusion DEMOnstration reactor (DEMO), extensive analyses were conducted in EUROfusion context, aiming at ultimately defining the design of the DEMO magnets system. In this objective CEA (Commissariat à l'Énergie Atomique et aux Énergies Alternatives) proposes design for both Central Solenoid (CS) and Toroidal Field (TF) cryomagnetic systems. Considering the latest DEMO reactor baseline both systems were investigated using pre-dimensioning CEA tool MADMACS, with an outcome of several options for each of them. In a second step those designs were investigated with detailed analyses (electromagnetic, thermohydraulic, mechanic). In the paper a broad analysis of the CS design considering fatigue constraints is shown, together with recommendations considering flux target. The TF system considered is an ITER-like option with radial plates and the detailed electromagnetic analysis is exposed and discussed in comparison with former methods. The outcome is used for a thermohydraulic detailed static analysis and a mechanical analysis of TF winding pack is provided and discussed in terms of results but of method as well. Global considerations and recommendations will also be provided to give a first view on cryomagnetic system optimization with respect to cost merits related to both magnet systems.

Solenoid

Dimensioning

Fusion power

Toroidal field

10.1109/tasc.2021.3068560

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Citations (6)

OLYMPE, a multi-physic platform for fusion magnet design: Development status and first applications

Cryogenics (2020)

L. Zani Benoît Lacroix A. Torre Jean-Claude Vallet C. Berthinier

Dimensioning

10.1016/j.cryogenics.2020.103086

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Citations (9)

Optimization of the cooling capacity of the cryo-magnetic system for EU DEMO at the pre-conceptual design phase

Fusion Engineering and Design (2019)

François Bonne Christine Hoa Q. Le Coz L. Zani Benoît Lacroix

Cooling capacity

Conceptual design

Cryogenics

10.1016/j.fusengdes.2019.04.028

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Citations (7)

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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Citations (10)

Parametric study and optimization of the cryo-magnetic system for EU DEMO at the pre-conceptual design phase

Cryogenics (2022)

Christine Hoa Thomas Latella François Bonne Benoît Lacroix Q. Le Coz

Solenoid

Mass flow rate

Mass flow

10.1016/j.cryogenics.2022.103475

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Citations (1)

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)

Dynamic simulation of the first cool down of the JT-60SA cryo-magnet system

Cryogenics (2022)

F. Michel François Bonne Kazuma Fukui K. Hamada Christine Hoa

Shields

Fusion power

10.1016/j.cryogenics.2022.103537

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Citations (3)

Optimization of the overall Toroidal Field Coil cryomagnetic system at the pre-conceptual design phase of the European DEMO fusion reactor

Fusion Engineering and Design (2021)

S. Varin François Bonne Christine Hoa Jean‐Marc Poncet L. Zani

Conceptual design

Solenoid

10.1016/j.fusengdes.2021.112883

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Citations (5)

Thermique des caloducs à rainures axiales : études et réalisations pour des applications spatiales

Christine Hoa

Le caloduc Al/NH3 a rainures axiales est un element principal du controle thermique passif des satellites de telecommunication. L'optimisation des capacites de transport et de la masse des profiles devient enjeu considerable necessitant une connaissance affinee des phenomenes de transfert de chaleur dans les rainures capillaires. La realisation d'un banc experimental de grande precision a permis d'acceder a une caracterisation complete en temperature de plusieurs profiles et d'en analyser finement les performances. Les travaux de modelisation a plusieurs echelles ont conduit a prendre en compte des phe��nomenes de plus en plus nombreux afin de tenter de correler les mesures experimentales: un modele thermique 2-D de rainure avec les interactions moleculaires a l'interface liquide-vapeur, un modele thermique 3-D de la zone evaporateur avec la recherche du front d'assechement des rainures par les methodes de thermique directe et inverse, un modele 1-D d'ecoulement hydrodynamique prenant en compte les interferences gravitaires liees aux tests au sol. La reflexion sur l'amelioration des performances thermiques des caloducs a partir des caracterisations numeriques et experimentales a permis de developper un concept novateur de rainures doubles laissant presager un gain theorique en capacite de transport de 30 % en 0g par rapport aux rainures axiales actuelles.

Source

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Citations (4)

Adaptation of the nuclear safety code CATHARE3 to supercritical helium flow

Cryogenics (2020)

Sulayman Shoala Christine Hoa E. Ercolani Jean‐Marc Poncet Kim-Claire Le Thanh

Thermal hydraulics

Safety valve

Cryogenics

10.1016/j.cryogenics.2020.103135

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Citations (3)