Core tungsten radiation diagnostic calibration by small shell pellet injection in the DIII-D tokamak

E. M. Hollmann, N. Commaux, D. Shiraki, N. Alexander, I. Bykov, A. L. Moser, D. Thomas, B. S. Victor

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Abstract

Injection of small (outer diameter = 0.8 mm) plastic pellets carrying embedded smaller (10 μg) tungsten grains is used to check calibrations of core tungsten line radiation diagnostics in support of the 2016 tungsten ring campaign in the DIII-D tokamak. Observed total brightness (1 eV-10 keV) and soft x-ray (1 keV-10 keV) brightness are found to be reasonably well (<factor 2) predicted using existing calibration factors and rate calculations. Individual core (extreme ultra-violet/soft x-ray) tungsten line brightness appears to be somewhat less reliable (factor 2-4) for the prediction of core tungsten concentration.

Original languageEnglish
Article number103501
JournalReview of Scientific Instruments
Volume88
Issue number10
DOIs
StatePublished - Oct 1 2017

Funding

Encouragement from E. Unterberg and P. Stangeby and useful discussions with B. Grierson on analysis of SXR data are gratefully acknowledged. Diagnostic support of A. Horton and B. Dannels is gratefully acknowledged. Permission from H. A. Scott to use the CRETIN code is gratefully acknowledged. The originating developer of ADAS is the JET Joint Undertaking. This work was supported in part by the U.S. Department of Energy under Nos. DE-FG02-07ER54917, DE-AC05-00OR22725, DE-FC02-04ER54698, and DE-AC52-07NA27344.

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