- AMER INST PHYSICS
A spectroscopic system equipped with image magnifying optics has-been developed for measuring a time-resolved plasma velocity at one discharge of a reversed-field-pinch plasma of the TPE-RX at National Institute of AIST. This spectroscopic system enables a simultaneous measurement from two different lines of sight, using two sets of quartz optical fiber bundles. This system provides a precise measurement of Doppler shift without the need for a calibration of the central location of a spectral line. Two fiber bundles are coupled to the entrance slit of a modified Czerny-Turner-type, 1-m-focal-length spectrometer with an 82 X 82 mm(2) grating. In order to adjust the spectral image of the exit slit to each surface of two sets of one-dimensional detector arrays, an optical system equipped with a toroidal mirror, a cylindrical mirror, and splitting mirrors has been developed. The focal lengths of the toroidal mirror are selected for focusing vertically on the splitting mirror and horizontally (wavelength direction) on detectors. Plasma rotation and ion temperature for 0 V impurity ions (278.1 nm) are successfully measured at one plasma shot with a 25-mus time resolution in the TPE-RX. (C) 2003 American Institute of Physics.
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