Centre d'études et d'expertise sur les risques, l'environnement, la mobilité et l'aménagement

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A cryogenically cooled channel-cut crystal monochromator using a helium refrigerator and heat exchanger Rev. ABSTRACTNuclear fusion reactors of the Tokamak type will be operated in a pulsed mode requiring the helium refrigerator to remove periodically large heat loads in time steps of approximately one hour. What are the necessary steps for a refrigerator to cope with such load variations?A series of numerical simulations has been performed indicating the possibility of an active refrigerator control with low exergetic losses. A basic comparison is made between the largest existing refrigerator sizes and the size required to service for example the ITER requirements.