Continuous Phase Measurement in the W7-X Infrared Interferometer by Means of a FPGA and High-Speed ADCs.

Esteban Hernandez, Luis and Sanchez, Miguel and Sanchez, Joaquin Pedro and Kornejew, Petra and Hirsch, Matthias and López Martín, Juan Antonio and Fernandez Herrero, Angel and Nieto-Taladriz García, Octavio (2010). Continuous Phase Measurement in the W7-X Infrared Interferometer by Means of a FPGA and High-Speed ADCs.. "Fusion Science and Technology", v. 58 (n. 3); pp. 771-777. ISSN 1536-1055.

Description

Title: Continuous Phase Measurement in the W7-X Infrared Interferometer by Means of a FPGA and High-Speed ADCs.
Author/s:
  • Esteban Hernandez, Luis
  • Sanchez, Miguel
  • Sanchez, Joaquin Pedro
  • Kornejew, Petra
  • Hirsch, Matthias
  • López Martín, Juan Antonio
  • Fernandez Herrero, Angel
  • Nieto-Taladriz García, Octavio
Item Type: Article
Título de Revista/Publicación: Fusion Science and Technology
Date: November 2010
ISSN: 1536-1055
Volume: 58
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Interferometry is used for measuring line average electronic densities in fusion plasmas. The W7-X stellarator will employ a two-color CO2 (10.591 m) and CO (5.295 m) heterodyne-infrared interferometer as an electronic density measurement diagnostic. The frequency displacement is 40 MHz for the CO2 wavelength and 25 MHz for the CO, so these values will fix the heterodyne frequencies. Because the frequency gap between the two carriers is wide enough and the detector sensitivity is similar for both wavelengths, it is possible to use a single detector for the two signals; nevertheless, they should be split with filters. Traditionally, the intermediate-frequency signals should be filtered, downconverted to a lower frequency by the use of analog circuitry, and then processed. A new approach is proposed. The intermediate-frequency signals are directly sampled by means of high-speed analog-to-digital converters followed by a digital diplexer and a specific phase-meter processor implemented in a field-programmable gate array. Preliminary results from the W7-X infrared interferometer prototype, without plasma, are presented.

More information

Item ID: 9607
DC Identifier: http://oa.upm.es/9607/
OAI Identifier: oai:oa.upm.es:9607
Official URL: http://www.new.ans.org/pubs/journals/fst/
Deposited by: Memoria Investigacion
Deposited on: 10 Nov 2011 09:07
Last Modified: 20 Apr 2016 17:57
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