New pulsed-magnets for 100 T, long-pulse and diffraction measurements

Abstract

Development of non-destructive pulsed magnet aiming at 100 T-generation beyond 80 T-field is our mission. For that purpose, we have been developing a new coil system, socalled "dual coil system" and succeeded in generation of 85 T. This magnet will open the nondestructive 100 T-field in the near future. New type of magnet with longer pulse duration also has been developed. This magnet has a gap between the inner coil and the outer one where liquid nitrogen can flow. Therefore, the magnet can be cooled down by liquid nitrogen rapidly. The repetition time has been reduced to 15 minutes for 60 T-field with the duration of about 30 msec. By means of this rapid-cooling technique, a magnet for X-ray diffraction measurement has been made. This magnet consists of split coils with a split gap of 5 mm and a duration time of about 30 msec. This magnet allows us to carry out X-ray diffraction measurement under pulsed high field. The maximum field of the magnet is found to be 38 T, which is limited by utilized energy of the capacitor bank.