Improved operation of the Michelson interferometer electron cyclotron emission diagnostic on DIII-D
- Institute for Plasma Research, University of Maryland, College Park, Maryland 20742-3511 (United States)
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94551-9090 (United States)
The measurement of accurate temperature profiles is critical for transport analysis and equilibrium reconstruction in the DIII-D tokamak. Recent refinements in the Michelson interferometer diagnostic have produced more precise electron temperature measurements from electron cyclotron emission and made them available for a wider range of discharge conditions. Replacement of a lens-relay with a low-loss corrugated waveguide transmission system resulted in an increase in throughput of 6 dB and a reduction of calibration error from 15{percent} to 5{percent}. The waveguide exhibits a small polarization scrambling fraction of 0.05 at the quarter-wavelength frequency and very stable transmission characteristics over time. Further reduction in error was realized through special signal processing of the calibration and plasma interferograms. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- General Atomics, San Diego, CA (United States)
- DOE Contract Number:
- AC03-89ER51114; W-7405-ENG-48
- OSTI ID:
- 488778
- Report Number(s):
- CONF-960543-; ISSN 0034-6748; TRN: 97:009949
- Journal Information:
- Review of Scientific Instruments, Vol. 68, Issue 1; Conference: 11. annual high-temperature plasma diagnostics conference, Monterey, CA (United States), 12-16 May 1996; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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