Laser two-color heterodyne interferometry is a proven method to measure electron density in fusion plasmas. Though only used in tokamaks with high electron densities, the idea of also using two-color laser interferometers for stellarators and small machines to replace far-infrared laser interferometers is being proposed. This will lead to low-cost, reliable, and easy to operate diagnostics for electron-density measurements. In this article, we present the interferometric experiments we have used for calibration of a two-color laser heterodyne system for electron-density measurements in the TJ-II stellarator. These experiments have been based on the use of a novel interferometric scheme: the heterodyne/homodyne interferometer. Finally, we describe the interferometer we have installed in the TJ-II stellarator and present the first results on mechanical-vibration subtraction and electron-density measurements with a two-color laser interferometer in a stellarator (TJ-II, Madrid, Spain).
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January 2001
Research Article|
January 01 2001
Laser interferometric experiments for the TJ-II stellarator electron-density measurements
Horacio Lamela;
Horacio Lamela
Departamento de Ingenierı́a Eléctrica, Electrónica y Automática, Universidad Carlos III de Madrid, Butarque, 15, Leganés, 28911 Madrid, Spain
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Pablo Acedo;
Pablo Acedo
Departamento de Ingenierı́a Eléctrica, Electrónica y Automática, Universidad Carlos III de Madrid, Butarque, 15, Leganés, 28911 Madrid, Spain
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and the Optoelectronics and Laser Technology Group;
and the Optoelectronics and Laser Technology Group
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James Irby
James Irby
Plasma Science and Fusion Center, Massachusetts Institute of Technology, 190 Albany Street, NW21-111, Cambridge, Massachusetts 02139
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Rev. Sci. Instrum. 72, 96–102 (2001)
Article history
Received:
April 08 1999
Accepted:
October 18 2000
Citation
Horacio Lamela, Pablo Acedo, and the Optoelectronics and Laser Technology Group, James Irby; Laser interferometric experiments for the TJ-II stellarator electron-density measurements. Rev. Sci. Instrum. 1 January 2001; 72 (1): 96–102. https://doi.org/10.1063/1.1333040
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