Development of electron cyclotron emission imaging system on the HL-2A tokamak

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4828671· OSTI ID:22220324

Jiang, M.; Shi, Z. B.; Liu, Z. T.; Ding, X. T.; Li, J.; Zhong, W. L.; Chen, W.; Che, Y. L.; Fu, B. Z.; Cui, Z. Y.; Sun, P.; Liu, Y.; Yang, Q. W.; Duan, X. R. ^[1]; Che, S.; Domier, C. W.; Luhmann, Jr., N. C.; Hu, X.; Spear, A. ^[2]

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1. Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041 (China)
2. Department of Electrical and Computer Engineering, University of California at Davis, Davis, California 95616 (United States)

A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of electron temperature fluctuations in the HL-2A tokamak. It is comprised of a front-end 24 channel heterodyne imaging array with a tunable RF range spanning 75–110 GHz, and a set of back-end ECEI electronics that together generate 24 × 8 = 192 channel images of the 2nd harmonic X-mode electron cyclotron emission from the HL-2A plasma. The simulated performance of the local oscillator (LO) optics and radio frequency (RF) optics is presented, together with the laboratory characterization results. The Gaussian beams from the LO optics are observed to properly cover the entire detector array. The ECE signals from the plasma are mixed with the LO signal in the array box, then delivered to the electronics system by low-loss microwave cables, and finally to the digitizers. The ECEI system can achieve temporal resolutions of ∼μs, and spatial resolutions of 1 cm (radially) and 2 cm (poloidally)

• OSTI ID: 22220324
• Journal Information: Review of Scientific Instruments, Vol. 84, Issue 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CYCLOTRON RESONANCE
CYCLOTRONS
DIGITIZERS
ELECTRON TEMPERATURE
ELECTRONS
EMISSION
FLUCTUATIONS
GHZ RANGE
HL-2A TOKAMAK
ION TEMPERATURE
MAGNETOHYDRODYNAMICS
MICROWAVE RADIATION
OSCILLATORS
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
RADIOWAVE RADIATION
SIGNALS
SPATIAL RESOLUTION