ELECTRON-TEMPERATURE DETERMINATION FROM NEUTRON RATE MEASUREMENTS FORNBI-HEATED HIGH-DENSITY TEXTOR PLASMAS

A fast computer code for the simulation and analysis of neutron signal s is used to map out parameter ranges where relevant plasma parameters can be determined from neutron rate measurements of plasmas heated by neutral beam injection (NBI). The comparison with experimental values from the TEXTOR database identifies a small number of NBI-heated high -density discharges where the measurement of the central electron temp erature by using second harmonic ECE emission becomes in principle imp ossible although its determination by using third harmonic emission is possible. The calculations show that the electron temperatures can be determined with sufficient accuracy from neutron emission rate measur ements. As an example of this novel application, core electron tempera tures are evaluated for TEXTOR discharges.