Engineering design of the neutral particle analyser system on ITER

Abstract

Engineering aspects of a neutral particle analyser setup for International Experimental Thermonuclear Reactor (ITER) have been considered. The setup consists of two neutral particle analysers, LENPA (for energy range of 10-200 keV) and HENPA (for range of 0.1-4 MeV). LENPA is intended for control of isotope ratio of the plasma hydrogen component by measuring an intensity ratio of hydrogen/deuterium/tritium fluxes. It will be incorporated into a system controlling the plasma isotope composition. HENPA is assumed to analyse He atom fluxes to study the fusion alpha particle distribution function. The analysers are located in the protecting vacuum container and are connected with ITER plasma vessel by a beam line. A suggested design of the beam line is described, a pressure distribution along the beam line is calculated, influence of collisions of neutral atoms with the working gas molecules on spectra of atoms is estimated. The design of the analysers will be described shortly.