New reflectometer systems for the DIII‐D tokamak (abstract)

During a machine vent in December 1991, two new reflectometer systems were successfully installed and tested on the DIII‐D tokamak. The first is an X‐mode broadband system primarily intended for density profile measurements, utilizing BWO sources and covering Q and V frequency bands (33–50 and 50–75...

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Bibliographic Details
Published in:Review of scientific instruments 1992-10, Vol.63 (10), p.4665-4665
Main Authors: Doyle, E. J., Kim, K. W., Burns, S., Nguyen, X., Peebles, W. A., Rhodes, T. L.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320 - Plasma Diagnostic Techniques & Instrumentation- (1992-)
CLOSED PLASMA DEVICES
OPTICAL REFLECTION
PERFORMANCE TESTING
PLASMA DENSITY
PLASMA DIAGNOSTICS
REFLECTION
TESTING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
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Summary:During a machine vent in December 1991, two new reflectometer systems were successfully installed and tested on the DIII‐D tokamak. The first is an X‐mode broadband system primarily intended for density profile measurements, utilizing BWO sources and covering Q and V frequency bands (33–50 and 50–75 GHz). The second system is an adaptation of a pre‐existing inside launch (high field side) ECRH waveguide to provide an inside launch reflectometer capability at the same frequencies and polarization as an outside launch fixed frequency O‐mode system. The new systems will have a dual role in both directly supporting the DIII‐D physics program, and also acting as flexible and adaptable test beds for the development of reactor relevant reflectometer systems, such as required for ITER. Specific examples of planned measurements include investigation of possible in/out plasma asymmetries at the L–H transition and ELMs, and demonstration of routine and reliable density profile measurements. It is expected that preliminary data from the inside launch system will be available by the time of the conference. This work is supported by the U. S. Department of Energy under Grant No. DE‐FG03‐86‐ER53225 and General Atomics subcontract SC120536 under DOE Contract No. DE‐AC03‐89ER51114.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143656