DESIGN AND TESTS OF A SUPERCONDUCTING MAGNET WITH A CRYOCOOLER FOR THE ION SOURCE DECRIS-SC
msra(2004)
Abstract
A superconducting magnet system (SMS) for the multicharged ion source DECRIS-SC was designed and manufactured at the Joint Institute for Nuclear Research. Successful tests of the SMS were conducted in late 2003 - early 2004. The peculiarities of this system are stipulated by using of a cryocooler 1 W in power for the cryostabilization of the magnet, and also by a special configuration of the magnetic field demanded for the source of ions. Four coils ensure induction of a magnetic field on the axes of the source of up to 3T (the mirror ratio of ~ 6) which considerably extends possibilities of the ion source from the point of view of producing intense highly charged ion beams. The problem of compensating large forces of interaction between the coils and surrounding iron yoke in this magnet has been successfully solved, and a reliable suspension of the magnet in a cryostat realized. For compounding of the windings working in vacuum at indirect cryostabilization prepreg is used. There has been applied a new technology of the superconducting magnet protection with the help of sectionalization of the windings, using passive elements of the protection based on "cold" diodes and resistances, as well as a new technology of active protection with normal zone detectors and heaters.
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