| Superconducting Focusing Solenoid For X-Band Klystron (1998) | |||||||||||||||
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| INTRODUCTION The X-band klystron, now being developed at KEK [1], requires a focusing solenoid whose warm bore aperture is about 180 mm and maximum axial field is 7 kGauss. The normal conducting solenoid used now consume electric power of about 50 kW. Use of superconducting solenoid, therefore, was considered in order to reduce this electric power consumption. A superconducting magnets, in general however, is needed to be cooled down by liquid helium and special skills are required to cool down the magnet. The superconducting solenoid system developed for the X-band klystron contains a conduction cooled superconducting solenoid, cooled by a Gifford-McMahon type refrigerator, which allows us to operate the system without supplying any cryogen [2,3]. The solenoid is cooled down to an operation temperature of about 4 K just by supplying electric power of 6 kW and cooling water. The system is successfully tested at MELCO, KEK, and SLAC. The cool down performance and field measurem | |||||||||||||||
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