Development of a millimeter and submillimeter wave ESR measurement system

In our facility, FIR center Fukui University Japan, several radiation sources of millimeter- and submillimeter-wave are available in addition to high power and high frequency gyrotrons that have been developed successfully. We have developed millimeter and submillimeter wave ESR measurement systems, mainly, to study magnetism at low temperature and in high magnetic field. The ESR measurement systems in our facilities and also recent results of the research of the magnetism are presented.