التفاصيل البيبلوغرافية
| العنوان: |
A fast-scanning heterodyne radiometer for electron cyclotron emission measurements in HT-7 superconducting tokamak. |
| المؤلفون: |
Zhang, S. Y., Zhang, S.Y., Poznyak, V. I., Poznyak, V.I., Ploskirev, G., Kalupin, D., Wan, Y. X., Wan, Y.X., Xie, J. K., Xie, J.K, Luo, J. R., Luo, J.R. |
| المصدر: |
Review of Scientific Instruments; May2000, Vol. 71 Issue 5, 3 Diagrams, 3 Graphs |
| مصطلحات موضوعية: |
RADIOMETERS, TOKAMAKS, CYCLOTRONS, ELECTRIC oscillators |
| مستخلص: |
A fast-scanning heterodyne radiometer employing a backward-wave oscillator (BWO) in 78-118 GHz was developed and installed for electron cyclotron emission (ECE) measurements in HT-7 superconducting tokamak. The radiometer measures 16 ECE frequency points with a scanning time period of 0.65 ms, each of the frequency points can be preset by the program to meet specific interests in physics. The high scanning speed is achieved by carefully choosing a BWO, very finely adjusting the radiometer over the full waveband, and by eliminating some elements that are routinely included in a fast-scanning radiometer system. A horizontal view of the ECE optics was installed to measure electron temperature profiles. The spatial resolution is about 1 cm (B[sub t]=2 T) in the center of the HT-7 minor cross section, determined by the intermediate frequency of 0.1-0.5 GHz in the radiometer. Vertically viewing optics along a perpendicular chord was also installed to study nonthermal ECE spectra. Preliminary measurement results in pellet injection plasma and lower-hybrid current drive plasma were presented. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
|
Copyright of Review of Scientific Instruments is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |