Abstract
Two insertable optical probes have been constructed to measure local ion temperature and flow velocity using the idea proposed by Fiksel et al. [Rev. Sci. Instrum. 69, 2024 (1998)]. The light from plasma is collected by an optical fiber bundle and transported to a high resolution spectrometer. Spatial resolution of a few centimeters is achieved by using a collimator and a view dump. One ion dynamics spectroscopy (IDS) probe is employed in the edge plasma of Madison Symmetric Torus reversed field pinch in combination with the high throughput (f∕4.5) and high resolution (0.15nm∕mm) IDS-II spectrometer. It has provided local ion temperature measurements of carbon and helium impurities with temporal resolution of 10μs and accuracy of about 5eV. The second instrument is used on the Magnetic Reconnection eXperiment, where the local temperature of helium ions (∼10eV) has been measured with 1eV accuracy. Details of the designs, calibrations, and data analysis are described.
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