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037 _ _ |a FZJ-2014-03630
041 _ _ |a English
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100 1 _ |0 P:(DE-Juel1)130621
|a Divin, Yuri
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245 _ _ |a Feasibility of ECE measurements using Hilbert-transform spectral analysis
260 _ _ |a La Grange Park, Ill.
|b American Nuclear Society
|c 2014
336 7 _ |a Journal Article
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520 _ _ |a Electron cyclotron emission (ECE) from hot tokamak plasmas is recognized nowadays as a very informative diagnostic of main plasma parameters. Among several instruments developed to measure ECE, only a Martin-Puplett interferometer operates in a broadband frequency range of ECE from 70 to 1000 GHz. To derive the absolute radiation temperature of the plasma, a total measurement system, including front-end radiation collection, a transmission line, and the interferometer, is calibrated using a hot/cold calibration source. It takes a long time to calibrate the ECE system because of the high values of the noise equivalent power (NEP). A new technique, Hilbert-transform spectral analysis, is proposed for ITER plasma ECE spectral measurements. The operation principle, characteristics, and advantages of the corresponding Hilbert-transform spectrum analyzer (HTSA) based on a high-Tc Josephson detector are described. Because of the lower NEP values of the Josephson detector, this spectrum analyzer might demonstrate shorter calibration times than those for the Martin-Puplett interferometer. Because of a principal difference between Fourier and Hilbert transforms, the HTSA might have an additional advantage in retrieving harmonic ECE radiation from a continuous thermal background.
536 _ _ |0 G:(DE-HGF)POF2-423
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700 1 _ |0 P:(DE-HGF)0
|a Pandya, H. K. B.
|b 1
773 _ _ |0 PERI:(DE-600)2132501-7
|p 399-405 3
|t Fusion science and technology
|v 65
|x 0748-1896
|y 2014
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|a Forschungszentrum Jülich GmbH
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|b Forschungsbereich Luftfahrt, Raumfahrt und Verkehr
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|v Space Science and Exploration
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914 1 _ |y 2014
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