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Title: Heterodyne interferometer of coaxial CO/sub 2/ and He--Ne lasers for plasma density measurements

Abstract

An interferometer using coaxial CO/sub 2/ and He--Ne lasers has been developed for electron density measurements in the reversed field pinch plasma. The interferometer uses the phase modulating heterodyne detection of 60 MHz. The CO/sub 2/ laser interferometer is free from the mechanical vibrations due to the reduction of the vibrations by the air springs and the compensation of the vibrations by the He--Ne laser interferometer. The electron density measurement during a long-time discharge of 50 ms without the disturbance by the vibrations is achievable. The resolution is less than 1/100 fringe of the CO/sub 2/ laser interferometer, therefore the electron line density as small as 1.1 x 10/sup 14/ electrons/cm/sup 2/ is detectable.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Matsushita Research Institute Tokyo, Inc., Higashimita Tama-ku, Kawasaki 214, Japan
OSTI Identifier:
5791917
Resource Type:
Journal Article
Journal Name:
Rev. Sci. Instrum.; (United States)
Additional Journal Information:
Journal Volume: 57:7
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; INTERFEROMETERS; DESIGN; PERFORMANCE; PLASMA DIAGNOSTICS; INTERFEROMETRY; REVERSE-FIELD PINCH; ELECTRON DENSITY; CARBON DIOXIDE LASERS; HELIUM-NEON LASERS; HETERODYNE RECEIVERS; ELECTRONIC EQUIPMENT; EQUIPMENT; GAS LASERS; LASERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; PINCH EFFECT; RADIO EQUIPMENT; 700102* - Fusion Energy- Plasma Research- Diagnostics

Citation Formats

Takahashi, H, Kimura, M, Sano, R, Nagayama, Y, and Miyamoto, K. Heterodyne interferometer of coaxial CO/sub 2/ and He--Ne lasers for plasma density measurements. United States: N. p., 1986. Web. doi:10.1063/1.1138644.
Takahashi, H, Kimura, M, Sano, R, Nagayama, Y, & Miyamoto, K. Heterodyne interferometer of coaxial CO/sub 2/ and He--Ne lasers for plasma density measurements. United States. https://doi.org/10.1063/1.1138644
Takahashi, H, Kimura, M, Sano, R, Nagayama, Y, and Miyamoto, K. 1986. "Heterodyne interferometer of coaxial CO/sub 2/ and He--Ne lasers for plasma density measurements". United States. https://doi.org/10.1063/1.1138644.
@article{osti_5791917,
title = {Heterodyne interferometer of coaxial CO/sub 2/ and He--Ne lasers for plasma density measurements},
author = {Takahashi, H and Kimura, M and Sano, R and Nagayama, Y and Miyamoto, K},
abstractNote = {An interferometer using coaxial CO/sub 2/ and He--Ne lasers has been developed for electron density measurements in the reversed field pinch plasma. The interferometer uses the phase modulating heterodyne detection of 60 MHz. The CO/sub 2/ laser interferometer is free from the mechanical vibrations due to the reduction of the vibrations by the air springs and the compensation of the vibrations by the He--Ne laser interferometer. The electron density measurement during a long-time discharge of 50 ms without the disturbance by the vibrations is achievable. The resolution is less than 1/100 fringe of the CO/sub 2/ laser interferometer, therefore the electron line density as small as 1.1 x 10/sup 14/ electrons/cm/sup 2/ is detectable.},
doi = {10.1063/1.1138644},
url = {https://www.osti.gov/biblio/5791917}, journal = {Rev. Sci. Instrum.; (United States)},
number = ,
volume = 57:7,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 1986},
month = {Tue Jul 01 00:00:00 EDT 1986}
}