Abstract
This paper describes some details and results of an active neutral beam diagnostic mounted on the WEGA Tokamak and used in conjunction with a single-channel neutral particle energy analyzer. The beam diagnostic permits temporal resolution over a 40-ms interval of the Tokamak discharge during which lower hybrid heating is applied. The central ion temperature was measured to be 270 eV before heating and 340 eV during 178 kW of heating. In addition, the central neutral atom density was deduced from experimental results to be (1.5±1)×1014 m−3 using this active measurement technique. The relative efficiency of the charge-exchange analyzer measured using the active beam is in good agreement with independent calibration.
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