Experimental study of lower hybrid wave power absorption on EAST
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090004_1_5.0162614.pdf
Description
Published version
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2.19 MB
Format
Adobe PDF
Checksum (MD5)
23568fced988c61853568a2747376eed
Author(s)
Date Issued
August 18, 2023
Journal
AIP Conference Proceedings
Publisher
AIP Publishing
Citation
S.-G. Baek, M. H. Li, P. T. Bonoli, B. J. Ding, G. M. Wallace, J. L. Chen, Y. M. Duan, X. Z. Gong, J. P. Qian, L. Wang, H. Yang, Q. Zang, J. Y. Zhang, X. J. Zhang; Experimental study of lower hybrid wave power absorption on EAST. AIP Conf. Proc. 18 August 2023; 2984 (1): 090004.
Version
Final published version
Abstract
Lower hybrid power absorption analysis is presented on the EAST high-density plasmas using the power modulation technique. The change in the plasma and magnetic energy is monitored to evaluate the power absorption coefficient by linearizing the change for the first 10 msec for the given input power. The power absorption coefficient evaluated is approximately 0.44 (0.35) for 4.6 GHz (2.45 GHz) at n̄e = 3.5x1019 m-3 GENRAY/CQL3D current drive modeling suggests a combination of antenna spectrum, accessibility, and edge losses could primarily be responsible for the observed level of power absorption. Evidence of first-pass parasite LH power flow causing impurity sputtering is also reported, suggesting a need for optimum power coupling. Implications of the experimental findings are discussed.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1063/5.0162614
