NDLI: Fast fourier transform based diagnostics for spectral characterization of millimeter waves in tokamaks

Content Provider	IEEE Xplore Digital Library
Author	Thoen, D.J. Bongers, W.A. Westerhof, E. Oosterbeek, J.W. de Baar, M.R. van den Berg, M.A. van Beveren, V. Burger, A. Goede, A. Graswinckel, M.F. Hennen, M.F. Schuller, F.C.
Copyright Year	2009
Description	Author affiliation: Forschungszentrum Jülich GMBH, Institut für Energieforschung - Plasmaphysik, Association EURATOM-FZJ, 52425 Jülich, Germany (Oosterbeek, J.W.; Burger, A.) \|\| FOM-Institute for Plasma Physics Rijnhuizen, Partner in the Trilateral Euregio Cluster P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands (Thoen, D.J.; Bongers, W.A.; Westerhof, E.; de Baar, M.R.; van den Berg, M.A.; van Beveren, V.; Goede, A.; Graswinckel, M.F.; Hennen, M.F.; Schuller, F.C.)
Abstract	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 down-converted and directly digitized using a fast analog-digital converter (ADC) and a compact Peripheral Component Interconnect (cPCI) 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 (ECRH) 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. Major benefit of the new diagnostics is a tunable time and frequency resolution due to post-detection, 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. Such a diagnostics also has the potential to detect Electron Cyclotron Emission (ECE) and to be used in Real-Time ECE feedback control systems.
Starting Page	1
Ending Page	2
File Size	215008
Page Count	2
File Format	PDF
ISBN	9781424454167
DOI	10.1109/ICIMW.2009.5325586
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-21
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fast Fourier transforms Tokamaks Scattering Frequency Plasma diagnostics Plasma waves Cyclotrons Analog-digital conversion Computer peripherals Power generation
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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