A low-energy neutral particle analyser for plasma experiments

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Abstract
A novel time-of-flight system for the analysis of low-energy neutral hydrogen atoms emitted from the boundary of a Tokamak plasma is described. The neutral flux emitted perpendicular to the wall is chopped in bunches of 1 mu s by a slotted cylinder driven by a modified turbopump. After a flight path of 2.2 m the particles are detected by a secondary particle detector. Single-particle pulses are collected in a multichannel analyser in the MCS mode with a time resolution of 1 mu s. Differential neutral emission spectra are calculated from the arrival time distributions. A number of results are presented to demonstrate the capability of the instrument.