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  • American Institute of Physics (AIP)  (2)
  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Apparatus for multipoint Thomson scattering measurements in the ETA-BETA II reversed field pinch experiment (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1027-1029 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A multipoint Thomson scattering apparatus under development for the measurement of spatial Te and ne profiles in the ETA-BETA II reverse field pinch experiment is described. The apparatus is based upon the two-channel analysis method already adopted in the TFR tokamak. The 90° scattered light is collected simultaneously from seven spatial positions along a plasma diameter by means of high-efficiency, quartz, fiber-optic light guides. The detection system consists of a set of high aperture (f/2.4), plane grating, Littrow spectrometers developed to match the high throughput of the collection optics. These instruments employ photomultipliers with a GaAs photocathode (quantum efficiency (approximately-equal-to)20%, λ=700 nm) and have a stray light rejection ratio of 3×10−4. Laboratory tests and preliminary measurements in ETA-BETA II have shown good sensitivity and a S/N ratio sufficient to diagnose plasmas with ne≥1013 cm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138524
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  • 2
    Electronic Resource
    Electronic Resource
    Automatic laser beam alignment for a Thomson scattering system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1482-1484 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A system for the automatic alignment of a pulsed ruby laser beam is under development for the Thomson scattering diagnostics of RFX, a large reversed-field pinch machine now under construction. In this experiment the laser will be 11 m from the machine and the beam alignment at the 750×4-mm scattering volume will be actively maintained to within 0.5 mm. The beam direction in space is measured in two reference planes fixed to the collection optics frame by means of two 80-mm2 fast quadrant photodiodes. A double-channel preamplifier is used for each quadrant in order to measure both the 30-ns FWHM ruby pulse and a low-power cw He–Ne beam propagating through the same optical path. Every time the main laser is fired, the relative direction of the two beams is determined so that the position of the He–Ne beam can be used for feedback control of the steering optics between plasma shots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139694
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    Paper (German National Licenses)
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