Neutron spectrometer to measure the ion temperature in the deuterium plasma experiments

Iwai, Haruki*; Naoi, Norihiro*; Asai, Keisuke*; Iguchi, Tetsuo*; Isobe, Mitsutaka*; Yukawa, Kyohei*; Kawarabayashi, Jun*; Konno, Chikara  

For ion temperature measurement in DD plasma experiments, we are developing a high energy resolution neutron spectrometer based on the associated particle detection using a proton recoil telescope and a time-of-flight spectrometer. To verify the operational principle and the basic performance of this system, we have set up a prototype system through Monte Carlo simulations and carried out a preliminary experiment with a DD neutron beam at the Fusion Neutronics Source (FNS), JAEA. The results have demonstrated that the energy resolution could be achieved around 5.0% (in FWHM) for DD neutrons