Multichannel microwave interferometer for the levitated dipole experiment

被引：9
|
作者：
Boxer, Alexander C. [1 ]
Garnier, Darren T. [2 ]
Mauel, Michael E. [2 ]
机构：
[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
[2] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2009年 / 80卷 / 04期
关键词：
calibration; electromagnetic wave interferometry; microwave measurement; plasma density; plasma diagnostics; ELECTRON-DENSITY;
D O I：
10.1063/1.3095684
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A four-channel microwave interferometer (center frequency: 60 GHz) has been constructed to measure plasma density profiles in the levitated dipole experiment (LDX). The LDX interferometer has a unique design owing to the unique geometry of LDX. The main design features of the interferometer are: (1) the transmitted beam traverses the plasma entirely in O-mode; (2) the interferometer is a heterodyne system employing two free-running oscillators; (3) four signals of data are received from just on transmitted beam; (4) phase shifts are detected in quadrature. Calibration tests demonstrate that the interferometer measures phase shifts with an uncertainty of approximately 5 degrees. Plasma densities in LDX corresponding to phase shifts of up to 5 pi are routinely and successfully measured.
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页数：4
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