Multichannel grazing-incidence spectrometer for plasma impurity diagnosis: SPRED

R. J. Fonck, A. T. Ramsey, R. V. Yelle

Research output: Contribution to journalArticlepeer-review

178 Scopus citations


A compact vacuum ultraviolet spectrometer system has been developed to provide time-resolved impurity spectra from tokamak plasmas. Two interchangeable aberration-corrected toroidal diffraction gratings with flat focal fields provide simultaneous coverage over the ranges lO0-1100 Å or 160-1700 Å. The detector is an intensified self-scanning photodiode array. Spectral resolution is 2 Å with the higher dispersion grating. Minimum readout time for a full spectrum is 20 msec, but up to seven individual spectral lines can be measured with a 1-msec time resolution. The sensitivity of the system is comparable with that of a conventional grazing-incidence monochromator.

Original languageEnglish (US)
Pages (from-to)2115-2123
Number of pages9
JournalApplied optics
Issue number12
StatePublished - Jun 15 1982

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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