Measurements of beam ion losses on DIII-D due to MHD instabilities
Abstract
A new scintillator-based fast ion loss detector (FILD) has been installed on DIII-D with the time response (>100 kHz) needed to study energetic ion losses induced by Alfvén eigenmodes (AEs) and other MHD instabilities. Based on the design used on ASDEX Upgrade, the diagnostic measures the pitch angle and gyroradius of ion losses based on the position of the ions striking the 2D scintillator. For fast time response measurements, a beam splitter and fiberoptics couple a portion of the scintillator light to a photomultiplier. Initial results showing first orbit losses and energetic ion loss due to MHD instabilities are discussed.
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