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The primary diagnostic on PBX for ion temperature measurements is charge exchange recombination spectroscopy of low Z ions, wherein fast neutrals from the heating neutral beams excite spectral lines from highly excited states (n≫4) of hydrogenic O, C, and He via charge exchange collisions with the respective fully stripped ions. Since the neutral beams on PBX provide relatively low‐velocity neutrals (i.e., D° beams at 44 keV), best signals are obtained using the near‐UV lines of O7+ (e.g., n=8–7, 2976 Å). Off‐line analysis of the Doppler broadened and shifted line profiles includes nonlinear least‐squares fitting to a model line profile, while a simplified on‐line fast analysis code permits between‐shot data analysis.