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Development and testing of a fast Fourier transform high dynamic-range spectral diagnostics for millimeter wave characterization

Rev. Sci. Instrum. 80, 103504 (2009); doi:10.1063/1.3244091

Published 21 October 2009

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D. J. Thoen,1 W. A. Bongers,1 E. Westerhof,1 J. W. Oosterbeek,2 M. R. de Baar,1 M. A. van den Berg,1 V. van Beveren,1 A. Bürger,2 A. P. H. Goede,1 M. F. Graswinckel,1 B. A. Hennen,1,3 and F. C. Schüller1
1Association EURATOM-FOM, Trilateral Euregio Cluster, FOM-Institute for Plasma Physics Rijnhuizen, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands
2Association EURATOM-FZJ, Institut für Energieforschung-Plasmaphysik, Forschungszentrum Jülich GMBH, 52425 Jülich, Germany
3Control Systems Technology Group, Eindhoven University of Technology, P.O. Box 513, NL-5600 MB Eindhoven, The Netherlands
A fast Fourier transform (FFT) based wide range millimeter wave diagnostics for spectral characterization of scattered millimeter waves in plasmas has been successfully brought into operation. The scattered millimeter waves are heterodyne downconverted and directly digitized using a fast analog-digital converter and a compact peripheral component interconnect computer. Frequency spectra are obtained by FFT in the time domain of the intermediate frequency signal. The scattered millimeter waves are generated during high power electron cyclotron resonance heating experiments on the TEXTOR tokamak and demonstrate the performance of the diagnostics and, in particular, the usability of direct digitizing and Fourier transformation of millimeter wave signals. The diagnostics is able to acquire 4 GHz wide spectra of signals in the range of 136–140 GHz. The rate of spectra is tunable and has been tested between 200 000 spectra/s with a frequency resolution of 100 MHz and 120 spectra/s with a frequency resolution of 25 kHz. The respective dynamic ranges are 52 and 88 dB. Major benefits of the new diagnostics are a tunable time and frequency resolution due to postdetection, near-real time processing of the acquired data. This diagnostics has a wider application in astrophysics, earth observation, plasma physics, and molecular spectroscopy for the detection and analysis of millimeter wave radiation, providing high-resolution spectra at high temporal resolution and large dynamic range. ©2009 American Institute of Physics
History: Received 7 July 2009; accepted 15 September 2009; published 21 October 2009
Permalink: http://link.aip.org/link/?RSINAK/80/103504/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.70.-m
    Plasma diagnostic techniques and instrumentation
  • 52.50.Qt
    Plasma heating by radio-frequency fields
  • 52.50.Sw
    Plasma heating by microwaves
  • 52.55.Fa
    Tokamaks
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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