Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment

doi:10.1016/j.fusengdes.2021.112914

HFCAS OpenIR

	Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment
	Li, X. L.1,2; Liu, Y.1 ; Xu, G. S.1; Zhou, T. F.1; Zhu, Y. L.3
	2021-11-01
发表期刊	FUSION ENGINEERING AND DESIGN
ISSN	0920-3796
通讯作者	Liu, Y.(liuyong@ipp.ac.cn)
摘要	A heterodyne interferometer for measuring the plasma electron density in Helicon Physics Prototype eXperiment (HPPX) has been developed and characterized in the laboratory. The heterodyne-type interferometer uses a probing beam of 85 GHz and a reference beam of 85.7 GHz by using two Gunn oscillators for facilitating frequency modulation. The cutoff density for this frequency is 8.96 x 10(19) m(-3) that is much higher than the nominal electron density of the HPPX plasmas. The maximum deflection angle due to the refraction effect is estimated to be 0.63. assuming a parabolic electron density profile, and the impact on the measurement is negligible for the plasmas with a size of 100 mm. Two identical HDPE lenses act as the vacuum windows, and the lenses working together with the transmitter and receiver horns, form a beam with the beam waist of about 20 mm located at the plasma center. The characterization results of the lens and the critical microwave components show good performance. The plasma electron density measurement results are in line with the expectation. Furthermore, the Signal to Noise Ratio (SNR) of the measurement is defined as SNR = 20lg((n) over bar (e)/S), where (n) over bar (e) and S are respectively the average electron density and the standard deviation of the signal, and the SNR is 80 dB. This demonstrates the system's capability of providing a clear and detailed density resolution.
关键词	Interferometer Gaussian beam propagation Electron density measurement
DOI	10.1016/j.fusengdes.2021.112914
收录类别	SCI
语种	英语
资助项目	National Magnetic Confinement Fusion Science Program of China[2015GB101000] ; U.S. DOE[DE-FG02-99ER54531]
项目资助者	National Magnetic Confinement Fusion Science Program of China ; U.S. DOE
WOS研究方向	Nuclear Science & Technology
WOS类目	Nuclear Science & Technology
WOS记录号	WOS:000716370400006
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/126503
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, Y.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China 3.Univ Calif Davis, Davis, CA 95616 USA
第一作者单位	中科院等离子体物理研究所
通讯作者单位	中科院等离子体物理研究所
推荐引用方式 GB/T 7714	Li, X. L.,Liu, Y.,Xu, G. S.,et al. Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment[J]. FUSION ENGINEERING AND DESIGN,2021,172.
APA	Li, X. L.,Liu, Y.,Xu, G. S.,Zhou, T. F.,&Zhu, Y. L..(2021).Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment.FUSION ENGINEERING AND DESIGN,172.
MLA	Li, X. L.,et al."Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment".FUSION ENGINEERING AND DESIGN 172(2021).