Design and first plasma measurements of the ITER-ECE prototype radiometer

On ITER, second harmonic optically thick electron cyclotron emission (ECE) in the range of 220-340 GHz will supply the electron temperature (T e). To investigate the requirements and capabilities prescribed for the ITER system, a prototype radiometer covering this frequency range has been developed...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.11E111-11E111
Main Authors: Austin, M. E., Brookman, M. W., Rowan, W. L., Danani, S., Bryerton, E. W., Dougherty, P.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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Summary:On ITER, second harmonic optically thick electron cyclotron emission (ECE) in the range of 220-340 GHz will supply the electron temperature (T e). To investigate the requirements and capabilities prescribed for the ITER system, a prototype radiometer covering this frequency range has been developed by Virginia Diodes, Inc. The first plasma measurements with this instrument have been carried out on the DIII-D tokamak, with lab bench tests and measurements of third through fifth harmonic ECE from high T e plasmas. At DIII-D the instrument shares the transmission line of the Michelson interferometer and can simultaneously acquire data. Comparison of the ECE radiation temperature from the absolutely calibrated Michelson and the prototype receiver shows that the ITER radiometer provides accurate measurements of the millimeter radiation across the instrument band.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4960163