This title appears in the Scientific Report :
2010
Please use the identifier:
http://hdl.handle.net/2128/16767 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.3244091 in citations.
Development and testing of a fast Fourier high dynamic-range spectral diagnostics for millimeter wave characterization
Development and testing of a fast Fourier high dynamic-range spectral diagnostics for millimeter wave characterization
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-digi...
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Personal Name(s): | Thoen, D.J. |
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Bongers, W.A. / Westerhof, E. / Oosterbeek, J.W. / de Baar, M.R. / van den Berg, M.A. / van Beveren, V. / Bürger, A. / Goede, A.P.H. / Graswinckel, M.F. / Hennen, B.A. / Schüller, F.C. / TEXTOR, Team. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Review of scientific instruments, 80 (2009) |
Imprint: |
[S.l.]
American Institute of Physics
2009
|
PubMed ID: |
19895061 |
DOI: |
10.1063/1.3244091 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Review of Scientific Instruments
80 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.3244091 in citations.
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. |