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 language | English |
---|---|
Article number | 103501 |
Journal | Review of Scientific Instruments |
Volume | 88 |
Issue number | 10 |
DOIs | |
State | Published - 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.