โ Scribed by G. Ruelle
No coin nor oath required. For personal study only.
There is general agreement worldwide on the basic structure of cryogenic generators, with a hot stator and a rotor v~th superconducting field winding at very low temperature (4 to 5 K). The main problems arising from cryogenic generator development especially concern the rotor: the problem of the electromagnetic and mechanical behaviour of the shield required for protecting the superconductor against the induction changes associated with any possible disturbances; the problem of the superconductor and helium cooling system behaviour associated with the particular operating conditions of a cryogenic generator; the problem of structural materials; technological problems arising from helium admission in the rotor. At the present stage of studies, one can positively state that the cryogenic generator is feasible, but its competitiv~ ness with respect to conventional generators has not been established. It is obvious that its chances of development could be greatly increased if a certain number of parallel research efforts succeeded in the following fields: development of superconductors with a high critical temperature; development of structural materials, both metallic and non-metallic; reduction of refrigerator costs; and increased reliability.
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