Recent and Planned Diagnostic Upgrades for HIT-SI and NSTX

The Helicity-Injected Torus (HIT-SI) is equipped with a variety of diagnostics, including a retractable Langmuir probe, a SPRED (Survey, Poor Resolution, Extended Domain) spectrometer and a bolometer. The Langmuir probe's analysis code has been optimized so that processed data is available shortly after each shot. The SPRED spectrometer has been upgraded with a second channel, and spectral data processing tools have been developed to enable operators to better assess Pulse Discharge Cleaning (PDC) on HIT-SI. Planned bolometry upgrades on HIT-SI include an improved calibration and the addition of two more instruments. The University of Washington bolometer design has also been successfully used on the National Spherical Torus Experiment (NSTX). The design of a new dual-chord bolometer for NSTX will be presented.