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Title: Optimization of the angular orientation for a fast ion loss detector in a tokamak
Contributors: Darrow, D.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: Tokamak
Fast ion loss
Particle phase space
Issue Date: Jan-2017
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Fusion Science and Technology, 2017
Abstract: A scintillator type fast ion loss detector measures the gyroradius and pitch angle distribution of superthermal ions escaping from a magnetically confined fusion plasma at a single location. Described here is a technique for optimizing the angular orientation of such a detector in an axisymmetric tokamak geometry in order to intercept losses over a useful and interesting ranges of pitch angle. The method consists of evaluating the detector acceptance as a function of the fast ion constants of motion, i.e. energy, canonical toroidal momentum, and magnetic moment. The detector acceptance can then be plotted in a plane of constant energy and compared with the relevant orbit class boundaries and fast ion source distributions. Knowledge of expected or interesting mechanisms of loss can further guide selection of the detector orientation. The example of a fast ion loss detector for the National Spherical Torus Experiment-Upgrade (NSTX-U) is considered.
Appears in Collections:NSTX-U

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