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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 88 (1982), S. 295-298 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 866-873 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Special electronic scanning circuits have been built to increase the resolution time of an intensified photodiode array assembly used for detecting EUV emission. The system can operate at 1-MHz sampling rate to provide data readout on two parallel output lines. The scanning time of a 1000-element array can be reduced to 500 μs. The system is programmable and can function sequentially at three different frequencies within a single scan. The device is CAMAC compatible and operated remotely by computer. It has been used to record spatial as well as temporal development of EUV radiation from the TEXTOR tokamak plasma.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 125-127 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A receiving system for a Thomson scattering experiment is described. This system includes a multichannel grating spectrometer designed for use with a high repetition rate Nd:YAG laser. Fiber-optic coupling bundles are used at the input and output ends. High throughput is maintained with large-diameter, low f-number grating and aspheric lenses. The detectors are high-responsivity, temperature-compensated avalanche photodiodes. Results of the calibration, including anti-Stokes Raman scattering, are presented. The spectrometer is designed to operate in the Te range between 50 eV and 2 keV with a minimum electron density sensitivity of 1.6×1011 cm−3.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3668-3671 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: As part of a fiber optic, interferometric pressure sensing array system for hypersonic wind tunnel studies, a 64 channel spectrometer has been developed to separate the return signals by both position and wavelength. The spectrometer is designed to optically separate the quadrature signals from the interferometer. A ribbon of single-mode fibers carrying the dual wavelengths (811.7 and 813.3 nm) from the sensing surface array forms the entrance slit to the spectrometer. This spectrometer uses a unique optical layout consisting of a 32 element microlens array, narrow passband interference filter and concave mirror to separate and focus the optical signals onto the photosensitive surface of a 1×64 photodiode array. The microlens array collimates the emerging beams from the single-mode fibers to minimize cross talk between channels. The detector array and its control electronics are an integral part of the spectrometer and are mounted on the same baseplate as the other optical components. Fast scanning and digitizing electronics produce an effective data rate of 160 kHz for 64 channels. Details of the construction and results of the calibration are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3528-3531 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A neutral beam diagnostic system has been designed to do simultaneous space potential and density measurements in the tokamak plasma edge to complement existing probe diagnostics. Rapid radial profiles are possible by computer control of the energy and the injection angle of the neutral beam. A particular application under consideration is the Tokamak de Varennes, which is presently being upgraded to operate either as a limiter or as a divertor machine. In this application, an ion gun is used to produce a Tl+1 beam that can be steered radially and toroidally to scan the plasma edge. The ion beam is neutralized downstream in a charge-exchange cell and the resulting Tl neutral beam is injected through a side port into the plasma. Singly charged Tl ions produced in the plasma exit through a top port of the tokamak and are collected by an electrostatic energy analyzer. Numerical simulations of the trajectories show that beam energies between 40 and 55 keV are sufficient to probe the plasma edge radially from 23 to 29 cm with a few millimeters resolution. The use of a neutral beam allows measurements in a tokamak edge plasma with BT∼1.0 T with a reduction in beam energy by more than a factor of 3 compared to the use of ion beams. Details of the beam probe hardware and the Tokamak de Varennes application are presented.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3308-3308 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Progress in the magnetic fusion programs has driven and been driven by the development of sophisticated diagnostic systems. The application of state of the art technologies has resulted in major strides in detailed measurements of plasma characteristics. We present the details of design studies carried out to develop specialized instrumentation. For application to optical spectroscopy, a compact multichannel spectroscopic monitor is described. This instrument is designed for simultaneous observation of plasma emissions from a variety of spatial locations. The heart of the system is an optical filter mosaic and MCP/CCD array. Applications include impurity emission monitoring, particle inventory, and working gas fraction measurements in minority heating experiments. The second instrument includes a detector design for application to high time resolution measurements of electron cyclotron emissions. The system is based on arrays of slot-antennae/detectors manufactured on single semiconductor wafers. This millimeter-wave monolithic integrated circuit (MMIC) device can be tailored to detect radiation in the 50–300 GHz range typical of tokamak plasmas. Advantages include uniformity of detector response, spectral resolution without gratings, and high spatial resolution. Details of both designs will be discussed with emphasis on ranges of application in present and next generation machines.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2987-2987 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A neutral beam diagnostic system has been designed to do simultaneous space potential and density measurements in the tokamak plasma edge to complement existing probe diagnostics. Rapid radial profiles are possible by computer control of the energy and the injection angle of the neutral beam. A particular application under consideration is the Tokamak de Varennes, which is presently being upgraded to operate either as a limiter or as a divertor machine. In this application, an ion gun is used to produce a Tl+1 beam that can be steered radially and toroidally to scan the plasma edge. The ion beam is neutralized downstream in a charge-exchange cell and the resulting Tl neutral beam is injected through a side port into the plasma. Singly charged Tl ions produced in the plasma exit through a top port of the tokamak and are collected by an electrostatic energy analyzer. Numerical simulations of the trajectories show that beam energies between 40 and 55 keV are sufficient to probe the plasma edge radially from 23 to 29 cm with a few millimeters resolution. The use of a neutral beam allows measurements in a tokamak edge plasma with BT∼1.0 T with a reduction in beam energy by more than a factor of 3 compared to the use of ion beams. Details of the beam probe hardware and the Tokamak de Varennes application are presented.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Quantitative Spectroscopy and Radiative Transfer 29 (1983), S. 157-172 
    ISSN: 0022-4073
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Quantitative Spectroscopy and Radiative Transfer 27 (1982), S. 493-498 
    ISSN: 0022-4073
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 172 (1980), S. 97-99 
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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