PPPL-4254 

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<b>Passive Spectroscopic Diagnostics for Magnetically-confined Fusion Plasmas</b>
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<b>Authors:</b> B.C. Stratton, M. Bitter, K.W. Hill, D.L. Hillis, and J.T. Hogan
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Spectroscopy of radiation emitted by impurities and hydrogen isotopes plays an important role in the study of magnetically-confined fusion plasmas, both in determining the effects of impurities on plasma behavior and in measurements of plasma parameters such as electron and ion temperatures and densities, particle transport, and particle influx rates. This paper reviews spectroscopic diagnostics of plasma radiation that are excited by collisional processes in the plasma, which are termed 'passive' spectroscopic diagnostics to distinguish them from 'active' spectroscopic diagnostics involving injected particle and laser beams. A brief overview of the ionization balance in hot plasmas and the relevant line and continuum radiation excitation mechanisms is given. Instrumentation in the soft X-ray, vacuum ultraviolet, ultraviolet, visible, and near-infrared regions of the spectrum is described and examples of measurements are given. Paths for further development of these measurements and issues for their implementation in a burning plasma environment are discussed.

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<b>Download <a href="PPPL-4254.pdf">PPPL-4254</a></b> PREPRINT* (pdf 4.4 MB)
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<b>*NOTICE</b>: This report is a preprint version of a manuscript that has been accepted for publication in Fusion Science and Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. 
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A definitive version will be published in:
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<a href="http://epubs.ans.org/rip/index.cgi?j=fst"><i>Fusion Science and Technology </a>

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