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Stabilities o f magnets in a h i g h gravitational field up t o 2000 G are discussed, based upon the experimental results o f forced quench t e s t s in a set o f rotating magnets, in order to establish the s t a b i l i t y design criterion o f field windings o f superconducting generators. R e l a t i o n s o f propagat i o n v e l o c i t i e s , recovery currents, minimum quench energy and heat transfer characteristics are studied, a g o o d agreement between the experimental results and a theory confirmed the improvement o f magnet s t a b i l i t y in a h i g h gravitational field because o f the enhanced heat transfer characteristics.Superconducting power generators are being developed in Japan, as a part of a R&D program on energy technology, the New Sunshine Project. In this development, national laboratories are taking a role of fundamental studies to contribute to the K&D being carried out mainly by the manufacturers involved in a research association, Super-GM. The stability design criteria of field windings is the issue of great importance to be clarified, because extremely high reliability is required not only for the safety but to ensure the operation of power generators free of troubles. The possibility of both of degradation and improvement of the stability of magnets is considered in a high gravitational field. Because the strong centrifugal force may deform the coil structure and generate friction loss in the wires of magnets, but the cooling characteristics by natural convection will be enhanced at the same time. It is our purpose to evaluate these effects quantitatively, and to establish the scaling law of the stability design criteria of field windings in a high gravitational field.

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