Development of a vibration-compensated CO2 interferometer for the RFX experiment
- 1 October 1990
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 61 (10), 2885-2887
- https://doi.org/10.1063/1.1141815
Abstract
The accuracy of a vibration‐compensated CO2 interferometer is often worse than expected in the design phase. This paper describes a laboratory study performed during the development of a multichord two‐color CO2 interferometer for the RFX experiment with the aim of assessing the performance of this diagnostic. The phase demodulation system (quadrature phase comparators and AGC linear IF amplifiers) has been carefully tested and a set of optimum conditions has been found for which its overall accuracy is better than 1°. Other sources of error such as noncompensated vibrations or standing waves in the acousto‐optic cells have been sought for and studied on a test bench interferometer. A scheme is proposed by which density measurements with an accuracy better than 1018 m−2 can be achieved.Keywords
This publication has 7 references indexed in Scilit:
- Two-color interferometer system for Alcator C-MODReview of Scientific Instruments, 1988
- Millimeter-wave interferometer for measuring plasma electron densityReview of Scientific Instruments, 1988
- Two-color interferometry for fusion plasma diagnosticsReview of Scientific Instruments, 1988
- Two-color CO2 interferometer with single Bragg cell and improved vibration compensation at 3.39 μmReview of Scientific Instruments, 1988
- Multichord, near infrared interferometers for the CTX and ZT-40M experimentsReview of Scientific Instruments, 1986
- Interferometric studies of plasma density fluctuations propagating along the major radius in ZT-40M, using time-delayed correlation techniquesPlasma Physics, 1982
- A vibration compensated high frequency heterodyne CO2laser interferometer for plasma diagnosticsJournal of Physics E: Scientific Instruments, 1982