Installation of an advanced heavy ion beam diagnostic on the TJ-II stellarator

An advanced 200 keV heavy ion beam diagnostic has been developed for the TJ -II stellarator based on the simultaneous utilization of a 30 degrees Proca -Green electrostatic energy analyzer and a multiple cell array detector. Th is innovative design allows instantaneous measurements of plasma potential and electron density profiles together with their respective fluctuations. In this article we present a description of the main parts of a heavy ion b eam diagnostic (injection system, detectors, and control and data acquisiti on system) and the results obtained during the first operation on TJ-II. Th e problems of plasma loading of the detectors and hard x-ray generation ass ociated with the probing beam are reported. (C) 2001 American Institute of Physics.