EFFECTS OF IRRADIATION ON ELECTRICAL-PROPERTIES OF MAGNETIC PROBES

Magnetic probes are installed on the first wall of a fusion reactor to measure the magnetic field. These magnetic probes are exposed to the neutrons generated by the D-T reaction and gamma-rays. However, electr ical properties and durability of the magnetic probe under irradiation have not yet been satisfactorily investigated. Therefore, irradiation tests have been performed for two types of magnetic probes at the JMT R (Japan Materials Testing Reactor). It has resulted from these irradi ation tests that the inductance of the magnetic probe with ceramic coa ted platinum wire is stable below about 550 degrees C, and the inducta nce of the magnetic probe with MI-cable of 0.5 mm diameter has a tempe rature dependency and maintains reproducibility even above 550 degrees C.