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  • 1
    Electronic Resource
    Electronic Resource
    Electron cyclotron measurements with the fast-scanning heterodyne radiometer on the tokamak fusion test reactor (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1974-1976 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Three fast-scanning heterodyne receivers, swept between 75 and 110, 110 and 170, and 170 and 210 GHz have measured electron cyclotron emission on the horizontal midplane of the tokamak fusion test reactor (TFTR) plasma. A second-harmonic microwave mixer in the 170–210-GHz receiver allows the use of a 75–110-GHz backward wave oscillator as a swept local oscillator. Electron temperature profile evolution data with a time resolution of 2 ms and a profile acquisition rate of 250 Hz will be presented for gas-fueled and pellet-fueled ohmic and neutral beam heated plasmas with toroidal fields up to 5.2 T. Recent results from a new swept-mode absolute calibration technique which can improve the accuracy and data collection efficiency during in situ calibration will also be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138810
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tokamak Fusion Test Reactor x-ray imaging diagnostic (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 830-832 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An array of 64 silicon surface-barrier diodes on a circular arc view Tokamak Fusion Test Reactor (TFTR) plasmas through a slot aperture to provide poloidal imaging of x-ray emission in the 200 eV–15 keV range. Information is inferred on magnetohydrodynamic (MHD) instabilities, disruptions, radiation, impurity transport, electron temperature, and electron thermal conductivity. Spatial resolution is 2.5 cm. Movable absorber foil arrays provide energy selection. Preamplifier–amplifier pairs have gains of 0.05–100 V/μA. Two outputs are provided with (1) 40-, 80-, and 300-Hz and (2) 40-, 80-, and 600-kHz filtering. The signals are digitized at rates up to 500 kHz and stored in 128K (total system) memory. Foils, gains, and filters are selectable from the control room by a computer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138187
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fast scanning heterodyne receiver for the measurement of the time evolution of the electron temperature profile on the Tokamak Fusion Test Reactor (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 928-930 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two fast scanning heterodyne receivers, swept between 75–110 and 110–170 GHz in 2 ms every 4 ms, were developed to measure the electron cyclotron emission on the horizontal midplane of the Tokamak Fusion Test Reactor (TFTR) plasma. An absolute, in situ calibration technique enables the determination of the profile of the plasma electron temperature from the fundamental ordinary mode and second harmonic extraordinary mode cyclotron emission intensity, with an accuracy of better than 10%. Temperature measurements made with the scanning receivers agree well with data from laser TV Thomson scattering and x-ray pulse-height analysis measurements. The time evolution of the temperature profile during temperature sawteeth fluctuations is well documented when the period of the fluctuation (30–100 ms) is much longer than the instrument sweep repetition time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138045
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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