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Passive Spectroscopic Diagnostics for Magnetically-Confined Fusion Plasmas
B. C. Stratton1, M. Bitter, K. W. Hill1, D. L. Hillis2, and J. T. Hogan2
'Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543
2Oak Ridge National Laboratory, Oak Ridge, TN 37831
ABSTRACT
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.
Accepted for publication in Fusion Science and Technology (May 2007).1
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B.C. Stratton, M. Bitter, K.W. Hill, D.L. Hillis, and J.T. Hogan. Passive Spectroscopic Diagnostics for Magnetically-confined Fusion Plasmas, report, July 18, 2007; Princeton, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc932622/m1/3/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.