Development of RF Window for 3.7-GHz LHCD System on HL-2A. (19th May 2018)

• Record Type: Journal Article
• Authors: Wang, C.; Lu, B.; Liang, J.; Zeng, H.; Bai, X. Y.; Chen, Y. L.; Huang, M.
• Is Part Of: Fusion science and technology. Volume 73:Number 4(2018)
• Page Start: 539
• Page End: 544
• Publication Date: 2018-05-19
• Subjects: lower-hybrid current drive -- radio-frequency window -- sapphire; Fusion reactors -- Periodicals; Nuclear fusion -- Periodicals; Fusion reactors; Nuclear fusion; Periodicals; 621.48405
• DOI: 10.1080/15361055.2017.1396149
• Languages: English
• ISSNs: 1536-1055

Abstract

Abstract: A pillbox-type radio-frequency window for lower-hybrid current drive power transmission of 3.7 GHz for 200 kW/2 s is designed. The relative permittivity and the loss tangent of several domestic materials—alumina, boron nitride, and sapphire—are exactly compared by the rectangular cavity perturbation method, and finally, the sapphire is chosen as the window medium. The reflection coefficient of the optimized window can reach 55−dB at 3.7 GHz simulated by high-frequency simulation software, and the peak temperature rise can be limited at 20°C with maximum thermal stress of 1.7 MPa by thermal and mechanical analysis. In the high-power test, 221 kW/3 s energy passes the welded window.