Characteristics of ion temperature measured with charge-exchange recombinationspectroscopy （CXRS） were studied in Ohmic,lower-hybrid-wave （LHW） driven and ion-cyclotron-resonance-frequency （ICRF） heated plasmas in HT-7.The results indicate that the central iontemperature Ti0 follows the one-third power law in the product of central line-averaged densityne and plasma current Ip in Ohmic discharges and is therefore consistent with the Artsimovichscaling law Ti0 = K· （Ip· Bt·ne · R2）1/3.It is shown that there is an appreciable increase ofion temperature during the operation with both LHW and ICRF and that the increment of iontemperature in those shots is mainly due to the energy transfer via collisions between ions andelectrons rather that by direct heating of the ions.
Diagnostic neutral beam (DNB), combined with spectral diagnostics, is employedto measure the ion temperature in HT-7. The factors affecting the extracted beam are studied inthe experiment for the high performance diagnostic neutral beam. A 6.5 A extracted hydrogencurrent at 43 keV of 100 ms was obtained after optimization. The extracted beam has a protonratio as high as 40%, and can penetrate into the core plasma after neutralization to measure theion temperature effectively.
石跃江符佳李颖颖William ROWAN黄河王福地高慧贤黄娟周倩刘胜张健李军谢远来刘智民黄懿赟胡纯栋万宝年DNB team
