DETERMINATION OF ION TEMPERATURE AND ROTATION VELOCITY PROFILES BY VISIBLE. UV AND X-RAY SPECTROSCOPY ON DOUBLET III

概要

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Spectroscopic diagnostics are utilized extensively on the Doublet III tokamak to determine ion temperature and toroidal rotation speed by means of the Doppler broadening and Doppler shift of spectral lines radiated by various impurity ions. Ion temperatures up to 6keV and rotation speeds up to 300km/s have been measured. Equipment employed in the four main systems ranges from visible spectrometers to a high resolution Bragg crystal X-ray spectrometer. Among the lines employed are visible and UV magnetic dipole lines of metallic impurities (e.g., Ti, Fe and Ni); visible and UV lines of He, C, and O excited by charge exchange recombination with neutrals from one of the hydrogen heating beams; and X-ray lines from He-like and Li-like Ti. The various systems give ion temperature profile information for discharges heated by Ohmic, neutral beam injection and electron cyclotron heating. Under neutral beam conditions, the systems based on charge exchange excitation produce seven point profiles every 20ms for the duration of the heating pulse. This talk will discuss the hardware utilized in each system, the theoretical basis for the data analysis and some of the difficulties encountered in extracting the desired information from complex spectra.
核融合科学研究所の論文