Abstract
The preliminary design of a heavy ion beam probe (HIBP) for the National Spherical Torus Experiment (NSTX) is presented. The primary purpose of the diagnostic would be to measure density and electric potential fluctuations and steady state potential profiles. A secondary purpose is magnetic equilibrium and fluctuation measurements. HIBP particle trajectories have been calculated for a double null discharge case. The key HIBP measurements can be made with the injection point—detection point combination which is presented, including a radial scan line at a single energy (for potential profile measurements), poloidally aligned sample volumes (for poloidal wavenumber measurements), and coverage of a large fraction of the upper low field quadrant of the plasma. In addition, the injection point can be combined with new detectors for radial array measurements (for density fluctuation and/or magnetic measurements). Due to a large range of angles at the detector, up to 23° poloidal angle range and a 6° toroidal angle range, a secondary sweep system will be necessary for NSTX.
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