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A comparative measurement of the neutral density and particle confinement time in EBT-S

Published online by Cambridge University Press:  13 March 2009

John C. Glowienka  and
Roger K. Richards
John C. Glowienka
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Roger K. Richards
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Abstract

The neutral density and particle confinement time in the ELMO Bumpy Torus-Scale Experiment (EBT-S) have been determined by two different techniques. These involve a spectroscopic measurement of molecular and atomic hydrogen emissions and a time-decay measurement of a fast-ion population using a diagnostic neutral beam. The results from both diagnostics exhibit identical trends for either estimate, although the absolute values differ by a factor of 2 to 3. The observed variations with fill gas pressure and microwave power from either technique are consistent with measurements of electron density and temperature. In this paper, the measurement techniques are discussed, and the results are compared in the context of consistency with independently observed plasma behaviour.

Type
Research Article
Information
Journal of Plasma Physics , Volume 35 , Issue 3 , June 1986 , pp. 519 - 528
Copyright
Copyright © Cambridge University Press 1986

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References

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