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  • 1
    Electronic Resource
    Electronic Resource
    Detector array for measurement of high-frequency fluctuations in visible and near-UV emission from tokamaks : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4614-4616 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We developed an imaging detector to measure high-frequency fluctuations in visible and near-UV emission from tokamaks. The detector is intended for the study of plasma turbulence, mhd phenomena, and edge-localized modes. Particularly in the first two applications, it will complement existing techniques by providing higher spatial resolution as well as measurement capability in otherwise inaccessible regions of the plasma. The device consists of an optical system, a linear array of 32 photodiodes, and an amplifier for each photodiode. The amplifiers have a transimpedance gain of 105–106 and the frequency response is flat to 100 kHz. Experience with this device has shown that optical imaging systems can be easily designed and tailored to a specific measurement because of the small size and close spacing of the individual light-sensitive elements. The device has been successfully tested on TEXT-U in measurements of Hα fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143685
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  • 2
    Electronic Resource
    Electronic Resource
    Application of a three sample volume S(k,ω) estimate to optical measurements of turbulence on TEXT : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 441-443 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The flexibility and nonintrusive nature of spectroscopic measurements can complement results from Langmuir probes by extending fluctuation measurements to otherwise inaccessible regions of the plasma. On TEXT, studies of fluctuations in Hα light using a photodiode array (PDA) detector [Hurwitz et al., Rev. Sci. Instrum. 63, 4614 (1992)] have yielded estimates for fluctuation characteristics that are in qualitative agreement with those from probes. The most obvious limitation of this spectroscopic diagnostic is its extended radial viewing volume which overlaps the naturally occurring velocity shear layer just inside the last closed flux surface (LCFS). We present here a three sample volume estimate for the spectral density function S(k,ω) which models the PDA signal as consisting of two modes in k space corresponding to the contributions from inside and outside of the shear layer. This method aids in the radial localization of the PDA measurement and may be applied to other diagnostics as well. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146375
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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