Electron temperature determination from neutron rate measurements for NBI-heated high-density TEXTOR plasmas

A fast computer code for the simulation and analysis of neutron signals 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 temperature by using second harmonic ECE emission becomes in principle impossible 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 measurements. As an example of this novel application, core electron temperatures are evaluated for TEXTOR discharges.