Electron temperature measurements from optically gray third harmonic electron cyclotron emission in the DIII-D tokamak
- Institute for Plasma Research, University of Maryland, College Park, Maryland 20742-3280 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94551-9090 (United States)
- General Atomics, San Diego, California 92186-9784 (United States)
In many high-performance discharges in the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. {bold 8}, 441 (1985)] high electron density prevents determining the electron temperature from the second harmonic electron cyclotron emission (ECE). A technique for obtaining central electron temperatures from optically gray third harmonic ECE is presented that does not require knowledge of the reflective properties of the vessel wall. The temperature values derived from ECE spectra measured with an absolutely calibrated Michelson interferometer agree with independent measurements by Thomson scattering. As part of this work, a method of determining the optical depth of third harmonic frequencies in a low aspect ratio tokamak is also demonstrated. The optical depth measurements are in agreement with calculations correct to first order in the Larmor radius. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- General Atomics, San Diego, CA (United States)
- DOE Contract Number:
- AC03-89ER51114; FC03-86ER52126; W-7405-ENG-48
- OSTI ID:
- 390442
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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