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Charge exchange recombination spectroscopy measurements of ion temperature and plasma rotation in PBX

1985; American Institute of Physics; Volume: 56; Issue: 5 Linguagem: Inglês

10.1063/1.1138075

1527-2400

Kurt P. Jaehnig, R. J. Fonck, K. Ida, E. T. Powell,

Mass Spectrometry Techniques and Applications

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.