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  • 1
    Electronic Resource
    Electronic Resource
    Probabilistic model of x-ray PHA data (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1926-1928 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A mathematical model of a single-arm x-ray pulse-height analyzer (PHA) system is developed. Given an assumption on the electron temperature and density profiles, a maximum likelihood technique is applied to calculate the peak electron temperature and enhancement factor of the plasma. This method is currently being used in the analysis of x-ray data from the tokamak fusion test reactor (TFTR); sample results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138798
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Perpendicular bremsstrahlung emission of suprathermal electrons (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2130-2132 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An interpretation of the x-ray bremsstrahlung emission by suprathermal electrons perpendicular to a magnetic field is given in terms of the parallel and perpendicular temperature of a three-temperature distribution function. The slope (i.e., the temperature) of the distribution can be determined relatively well. Factor-of-two uncertainties remain for the number of electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138761
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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
    Evaluation of soft x-ray average recombination coefficient and average charge for metallic impurities in beam-heated plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2148-2150 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The soft x-ray continuum radiation in tokamak fusion test reactor (TFTR) low-density neutral-beam discharges can be much lower than its theoretical value obtained by assuming a corona equilibrium. This reduced continuum radiation is caused by an ionization equilibrium shift toward lower states, which strongly changes the value of the average recombination coefficient of metallic impurities γ¯, even for only slight changes in the average charge Z¯. The primary agent for this shift is the charge exchange between the highly ionized impurity ions and the neutral hydrogen, rather than impurity transport, because the central density of the neutral hydrogen is strongly enhanced at lower plasma densities with intense beam injection. In the extreme case of low-density, high neutral-beam power TFTR operation (energetic ion mode) the reduction in γ¯ can be as much as one-half to two-thirds. We calculate the parametric dependence of γ¯ and Z¯ for Ti, Cr, Fe, and Ni impurities on neutral density (equivalent to beam power), electron temperature, and electron density. These values are obtained by using either a one-dimensional impurity transport code or a zero-dimensional code with a finite particle confinement time. As an example, we show the variation of γ¯ and Z¯ in different TFTR discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138712
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the wall radiation in soft x-ray region in PDX (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1160-1164 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8–20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measure the plasma and the wall radiation at the same time, the measurements allow the conclusion that the wall radiation can be attributed essentially to fluorescence (line radiation, e.g., Ti-Kα) and scattering (continuum part of the wall radiation spectrum). The fluorescence and the scattering are both caused by soft x-ray radiation flux coming from the plasma. There seems to be no need to invoke other, more exotic causes for the wall radiation, for example, charge particle bombardment of the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138022
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Tokamak Fusion Test Reactor horizontal high-resolution Bragg x-ray spectrometer (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1165-1168 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A bent quartz-crystal spectrometer of the Johann type with a spectral resolution of λ/Δλ= 10000–25000 is used on the Tokamak Fusion Test Reactor (TFTR) to determine central plasma parameters from the spectra of helium-like and lithium-like metal impurity ions (Ti, Cr, Fe, and Ni). The spectra are observed along a central radial chord and are recorded by a position-sensitive multiwire proportional counter with a spatial resolution of 250 μ. Standard delay-line time-difference readout is employed. The data are histogrammed and stored in 64 K of memory providing 128 time groups of 512-channel spectra. The central ion temperature and the toroidal plasma rotation are inferred from the Doppler broadening and Doppler shift of the Kα lines. The central electron temperature, the distribution of ionization states, and dielectronic recombination rates are obtained from satellite-to-resonance line ratios. The performance of the spectrometer is demonstrated by measurements of the Ti xxi Kα radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138023
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    Paper (German National Licenses)
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  • 7
    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
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of the wall radiation in soft x-ray region in PDX (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 847-847 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8–20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measure the plasma and the wall radiation at the same time, the measurements allow the conclusion that the wall radiation can be attributed essentially to fluorescence (line radiation, e.g., Ti-Kα) and scattering (continuum part of the wall radiation spectrum). The fluorescence and the scattering are both caused by soft x-ray radiation flux coming from the plasma. There seems to be no need to invoke other, more exotic causes for the wall radiation, for example, charge particle bombardment of the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138067
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    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Tokamak Fusion Test Reactor horizontal high-resolution Bragg x-ray spectrometer (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 848-848 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A bent quartz-crystal spectrometer of the Johann type with a spectral resolution of λ/Δλ= 10000–25000 is used on the Tokamak Fusion Test Reactor (TFTR) to determine central plasma parameters from the spectra of helium-like and lithium-like metal impurity ions (Ti, Cr, Fe, and Ni). The spectra are observed along a central radial chord and are recorded by a position-sensitive multiwire proportional counter with a spatial resolution of 250 μ. Standard delay-line time-difference readout is employed. The data are histogrammed and stored in 64 K of memory providing 128 time groups of 512-channel spectra. The central ion temperature and the toroidal plasma rotation are inferred from the Doppler broadening and Doppler shift of the Kα lines. The central electron temperature, the distribution of ionization states, and dielectronic recombination rates are obtained from satellite-to-resonance line ratios. The performance of the spectrometer is demonstrated by measurements of the Ti xxi Kα radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138068
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Measurement of the FeXXV dielectronic recombination rate coefficient in the PLT tokamak plasma
    Amsterdam : Elsevier
    Physics Letters A 93 (1983), S. 189-192 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(83)90044-0
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    Paper (German National Licenses)
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