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

doi:10.1016/j.fusengdes.2021.112914

	Design and characterization of a single-channel microwave interferometer for the Helicon Physics Prototype eXperiment
	Li, X. L.1,3; Liu, Y.3; Xu, G. S.3; Zhou, T. F.3; Zhu, Y. L.2
刊名	FUSION ENGINEERING AND DESIGN
	2021-11-01
卷号	172
关键词	Interferometer Gaussian beam propagation Electron density measurement
ISSN号	0920-3796
DOI	10.1016/j.fusengdes.2021.112914
通讯作者	Liu, Y.(liuyong@ipp.ac.cn)
英文摘要	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.
资助项目	National Magnetic Confinement Fusion Science Program of China[2015GB101000] ; U.S. DOE[DE-FG02-99ER54531]
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000716370400006
资助机构	National Magnetic Confinement Fusion Science Program of China ; U.S. DOE
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/126502]
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.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Univ Calif Davis, Davis, CA 95616 USA 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
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).