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  • 1985-1989  (4)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Determination of the structure of magnetic islands on TFTR (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1797-1800 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Mirnov coil array, the horizontal soft x-ray camera, and the ECE (electron cyclotron emission) grating polychromator are used to unfold the structure of m≥2 coherent magnetic fluctuations (assumed to be tearing modes) observed in TFTR. The modes are found predominantly in the enhanced confinement, or supershot, regime, and when present seriously degrade confinement. The poloidal and toroidal mode numbers (m and n) are determined with the Mirnov coil array. The radial structure is found by calculating the theoretical radial eigenmode (based on the calculated current-density profile) and scaling the resulting linear eigenmode with the measured fluctuation amplitude at the plasma edge. The presence of rotating magnetic islands is detected as fluctuations on both the chord-averaged soft-x-ray emissivity measurements and the fast grating polychromator electron temperature measurements. The ECE and soft-x-ray systems are used to identify coherent modes as islands and confirm estimates of the islands' location inferred from the Mirnov coil data and calculated current-density profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140116
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    TFTR Mirnov loop system (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2084-2086 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Magnetic pick-up loops (Mirnov coils) located on the inner wall of the tokamak fusion test reactor (TFTR) vacuum vessel have been used to study magnetic fluctuations in the plasma. To study the high-frequency magnetic turbulence associated with beam injection, the signal from one coil is passed through a comb filter, which gives a measure of the frequency spectrum throughout the shot. To look for tearing modes, the signals from a poloidal array of 15 coils are summed in an analog system to give the amplitudes of the m=2, 3, and 4 coherent modes throughout the shot. Additionally, 20 coil signals are digitized individually at a rate of 100 kHz for 80 ms and at 10 kHz for 800 ms. These data may also be analyzed off line to get both the toroidal and poloidal mode numbers as well as the frequency spectrum for a limited portion of the discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138746
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diagnostic applications of the TFTR XIS system (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2136-2138 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The horizontal x-ray imaging system (XIS) on the tokamak fusion test reactor (TFTR) tokamak is an array of 64 silicon surface-barrier x-ray diodes, with a 2.5-cm spatial resolution. The XIS system is primarily used to study magnetohydrodynamic (MHD) instabilities, but has also been used to measure electron thermal diffusivity, electron temperature, the radius of the q=1 surface, plasma vertical position, and toroidal rotation of the plasma. Movable absorber-foil arrays provide energy selection. Bandpass analog filters and digital techniques have been used on the x-ray signals in an attempt to infer turbulence levels in the plasmas. Details of the above techniques will be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138709
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of finite beta modified drift wave in a tokamak plasma (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1866-1876 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The saturated state of a low-frequency, coherent, m=2, global mode has been studied in the Encore tokamak using probe techniques. The mode is found to have large fluctuations in density, electron temperature, space potential, and magnetic field. The experimental measurements were compared with the predictions of a computer code, based on a linear, two-fluid theory of the coupling of drift and shear-Alfvén modes. This comparison led to the identification of the mode as a finite beta modified drift wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864930
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    Paper (German National Licenses)
    Fulltext
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