Implementation and data processing of a five-channel microwave interferometer with high temporal resolution and low noise on Sino-UNIted Spherical Tokamak

被引：4

作者：

Su, Pengjuan ^{[1
]}

Zhong, Heng ^{[1
]}

Tan, Yi ^{[1
]}

Gao, Zhe ^{[1
]}

Zai, Yingqi ^{[1
]}

Liu, Haiqing ^{[2
]}

Zeng, Long ^{[2
]}

Zhu, Xiang ^{[3
]}

Ling, Bili ^{[2
]}

Cheng, Zhengbo ^{[1
]}

Liu, Wenbin ^{[1
]}

Wang, Shouzhi ^{[1
]}

Wang, Binbin ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China

[3] Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2021年 / 92卷 / 04期

关键词：

D O I：

10.1063/5.0043667

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A five-channel microwave interferometer with high temporal resolution and high phase resolution has been developed for measuring electron density profiles and fluctuations on the Sino-UNIted Spherical Tokamak. A correction algorithm, based on the low signal amplitude detection, is proposed to eliminate the fringe jump errors. The correction algorithm achieves an accuracy of 92%. The density profile is reconstructed through the Park-matrix method, with the geometry of magnetic surfaces calculated by the equilibrium fitting. The reconstructed density profiles for discharges with supersonic molecular beam injection are in good agreement with the results of another 94 GHz single-channel horizontal interferometer and the Langmuir probes. The temporal resolution of the system is 0.5 mu s and the line-integrated electron density resolution is 1 x 10(15) m(-2), which benefits from the single sideband modulation technique. Therefore, the multichannel interferometer system is capable of studying the details of the high-frequency (up to 200 kHz) density fluctuation such as that in the minor disruption event.

引用

页数：5