ENERGY-DISTRIBUTION OF DEUTERIUM ATOMS RECYCLING ON MOLYBDENUM LIMITER SURFACE

The emission spectrum of deuterium atoms (D-alpha) was measured at the surface of a movable molybdenum limiter in the reversed field pinch m achine (RFP: TPE-1RM20). The intensity of the D-alpha line increased w ith the insertion depth of the limiter. The observed line profile was fitted by a combination of two Gaussian functions with different tempe ratures. The temperatures derived from the fitted functions were appro ximately 5000 K and 50 000 K. The temperatures were independent of the insertion depth. No Doppler shifted shoulder, which would correspond to neutralized reflected ions at the limiter surface, was observed in the present experiment.