A 10-Channel Neutral Particle Energy Analyser for Measurements of Ion Temperatures on Tokamak Plasmas

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Abstract
A 10-ch neutral particle energy analyser and its application to JAERI-tokamak devices are described. The analyser is a 45-degree parallel-plate electrostatic type with ten ion detectors.The analyser was calibrated for the energy and transmission efficiency by using electron and proton beams, and the conversion efficiency in the charge-stripping cell was experimentally obtained with hydrogen-atom beams. By using the analyser, ion temperatures of the JFT-2a and JUT-2 devices have been measured. It is found that the ion temperature can be determined with sufficient accuracy from six plasma shots (three shots to measure particle signals and three shots to determine background nxoises). The peak ion temperatures ranging from 80 to 350 eV are about (1/2-1/4) of the.central electron temperatures.

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