Calibration of a high spatial resolution laser two-color heterodyne interferometer for density profile measurements in the TJ-II stellaratorReport as inadecuate




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Publisher: American Institute of Physics

Issued date: 2008-10-01

Citation: Review of Scientific Instruments, 2008, 7910, 5 p.

ISSN: 0034-6748 Print1089-7623 Online

DOI: 10.1063-1.2973326

Publisher version: http:-dx.doi.org-10.1063-1.2973326

Keywords: Calibration , Stellarator TJ-II , Interferometría

Abstract:A high spatial resolution two-color CO2, lambda=10.6 mum, He-Ne, lambda=633 nm interferometer for density profile measurements in the TJ-II stellarator is under development and installation, based in the currently operational single channel two-color heterodA high spatial resolution two-color CO2, lambda=10.6 mum, He-Ne, lambda=633 nm interferometer for density profile measurements in the TJ-II stellarator is under development and installation, based in the currently operational single channel two-color heterodyne interferometer. To achieve the objectives of 32 channels, with 4-5 mm lateral separation between plasma chords, careful design and calibration of the interferometric waveforms for both the measurement and vibration compensation wavelengths are undertaken. The first step has been to set up in our laboratories an expanded-beam heterodyne-homodyne interferometer to evaluate the quality of both interferometric wavefronts, a reported source of poor vibration compensation and thus low resolution in the density profile measurements. This novel interferometric setup has allowed us to calibrate the spatial resolution in the profile measurements resulting in ~2 mm lateral resolution in the reconstruction of the interferometric wavefront.+-

Description:Proceedings of: 17th Topical Conference on High-Temperature Plasma Diagnostics, Albuquerque, New Mexico, 11-15 May 2008





Author: Acedo, Pablo; Pedreira Conchado, Pablo; Criado, Ángel Rubén; Lamela, Horacio; Sánchez, Miguel; Sánchez, Joaquín

Source: http://e-archivo.uc3m.es


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Universidad Carlos III de Madrid Repositorio institucional e-Archivo http:--e-archivo.uc3m.es Grupo de Optoelectrónica y Tecnología Láser (GOTL) DTE - GOTL - Comunicaciones en Congresos y otros eventos 2008-10-01 Calibration of a high spatial resolution laser two-color heterodyne interferometer for density profile measurements in the TJ-II stellarator Acedo, Pablo American Institute of Physics Review of Scientific Instruments, (2008), 79(10), 5 p. http:--hdl.handle.net-10016-16512 Descargado de e-Archivo, repositorio institucional de la Universidad Carlos III de Madrid REVIEW OF SCIENTIFIC INSTRUMENTS 79, 10E713 共2008兲 Calibration of a high spatial resolution laser two-color heterodyne interferometer for density profile measurements in the TJ-II stellaratora… Pablo Acedo,1 P.
Pedreira,1 A.
R.
Criado,1 Horacio Lamela,1 Miguel Sánchez,2 and Joaquín Sánchez2 1 Universidad Carlos III de Madrid, Avda.
de la Universidad 30, Leganés, 28911 Madrid, Spain Laboratorio Nacional de Fusión por Confinamiento Magnético-CIEMAT, Ciudad Universitaria s-n, 28040 Madrid, Spain 2 共Presented 13 May 2008; received 12 May 2008; accepted 30 July 2008; published online 31 October 2008兲 A high spatial resolution two-color 共CO2, ␭ = 10.6 ␮m, He–Ne, ␭ = 633 nm兲 interferometer for density profile measurements in the TJ-II stellarator is under development and installation, based in the currently operational single channel two-color heterodyne interferometer.
To achieve the objectives of 32 channels, with 4 – 5 mm lateral separation between plasma chords, careful design and calibration of the interferometric waveforms for both the measurement and vibration compensation wavelengths are undertaken.
The first step has been to set up in our laboratories an expanded-beam heterodyne-homodyne interferometer to evaluate the quality of both interferometric wavefronts, a reported source of poor vibration compensation and thus low resolution in the density profile ...





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