Abstract
A fiber-glass reinforced plastic (FRP) cryostat has been developed for a 1MJ pulsed magnet. The FRP cryostat consists of two tanks with 100 superinsulation layers. The inner tank has an inner diameter of 62cm, a depth of 150cm, and a wall thickness of 1.2cm. Both tanks are made of fiber-glass reinforced vinyl polyester resin by a hand lay up method without any joints. The steady state heat leak measured was about 1.4W. A 10-7Torr vacuum was achieved when liquid helium had been pooled in it.
