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A diagnostic for electron dynamics in tokamaks. Final report
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A diagnostic for electron dynamics in tokamaks. Final report

Frederick Skiff and Derek Boyd
354987
USDOE Office of Energy Research, Washington, DC (United States)
12/1997
DOI: 10.2172/354987
url
https://doi.org/10.2172/354987View
Published (Version of record) Open Access

Abstract

The diagnostic was installed on TdeV and brought into operation. It was optimized to the extent that time and money permitted. A considerable quantity of data was accumulated and analyzed. Experiments ended in August 1995. The apparatus has been removed from TdeV and returned to the University of Maryland. Each of these activities is detailed here. The diagnostic worked very well. Although the distribution functions behaved in ways that were not anticipated and the refractive losses were sometimes higher than projected, the authors were able to adapt to the unexpected. In the authors` estimation, all of the effects listed above are significant, and warrant further study. The diagnostic is ready for use as a tool to study the physics of current drive and current profile modification. A mechanism for steering the launched beams is desirable to cope with the strong variations in refraction which are seen. Phased array launchers seem attractive for this purpose. Tuning of the length of the waveguide run is important to avoid troublesome reflections (return losses). It may be best to build in this capability in a future system. The perpendicular dynamics of the current driven electrons are invisible to us with the present form of the diagnostic. Simultaneous measurements at fundamental and harmonic frequencies would make perpendicular distribution function measurements possible.
 Data Acquisition Data Analysis 70 PLASMA PHYSICS AND FUSION DECOMMISSIONING DISTRIBUTION FUNCTIONS ELECTRONS PLASMA DIAGNOSTICS PROGRESS REPORT TOKAMAK DEVICES

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