NEUTRON EMISSION SPECTROSCOPY FOR MAGNETIC CONFINEMENT EXPERIMENTS

摘要

It was noted that neutron emission spectroscopy (NES) has been used for over four decades of magnetic fusion research to answer questions pertaining to the fusion quality of plasmas and to gauge progress towards the ignition condition. The JET deuterium-tritium (DT) experiments of 1997 meant record high fusion power and a breakthrough for NES where both projeceted and new diagnostic functions were demonstrated. The present JET and its planned enhanced program (JET-EP) will offer and require extended use of NES diagnostics in the further exploration of pre-ignition plasmas of yet higher Q and η. This will be exploited with new instrumentation incuding the strategically important development of a high performance spectrometer for D-plasmas. The NES program at JET is the main (presently only) base of developing NES diagnostics for the next step experiments, viz. ITER, operating in the pre-ignition regime where fusion quality issues should be central. Why is then ITER presently without a NES program?