Multi-channel neutral particle energy analyser for measuring ion temperatures in tokamak plasmas

A multi-channel neutral particle energy analyser has been constructed for reducing the time of measurement and improving the accuracy of measurement in Tokamak plasmas. It consists of a charge stripping cell, a 10-channel electrostatic energy analyser and an ion detector. The maximum number of detected particles in the analyser is 106 cps. Energy calibration of the electrostatic energy analyser was performed with an electron beam, transmission efficiency calibration with a proton beam. The analyser was found measuring the ion temperatures in Tokamak plasmas properly. The stripping cell efficiency for H2 gas was also measured; the value is in agreement with that calculated from the charge-stripping and charge-exchange cross sections. (author)