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  • 1
    Electronic Resource
    Electronic Resource
    Electron cyclotron measurements with the fast-scanning heterodyne radiometer on the tokamak fusion test reactor (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1974-1976 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Three fast-scanning heterodyne receivers, swept between 75 and 110, 110 and 170, and 170 and 210 GHz have measured electron cyclotron emission on the horizontal midplane of the tokamak fusion test reactor (TFTR) plasma. A second-harmonic microwave mixer in the 170–210-GHz receiver allows the use of a 75–110-GHz backward wave oscillator as a swept local oscillator. Electron temperature profile evolution data with a time resolution of 2 ms and a profile acquisition rate of 250 Hz will be presented for gas-fueled and pellet-fueled ohmic and neutral beam heated plasmas with toroidal fields up to 5.2 T. Recent results from a new swept-mode absolute calibration technique which can improve the accuracy and data collection efficiency during in situ calibration will also be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138810
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    TFTR Michelson interferometer electron cyclotron emission diagnostic (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 925-927 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In July 1984, a Fourier transform spectrometer employing a fast-scanning Michelson interferometer began operating on TFTR. This diagnostic system can measure the electron cyclotron emission spectrum 72 times per s with a time resolution of 11 ms and a spectral resolution of 3.6 GHz. The initial operating spectral range is 75–540 GHz, which is adequate for measuring the first three cyclotron harmonics at present TFTR magnetic field levels. The range can be extended easily to 75–1080 GHz in order to accommodate increases in toroidal magnetic field or to study superthermal ECE. The measured spectra are absolutely calibrated using a liquid nitrogen cooled blackbody reference source. The second harmonic feature of each spectrum is used to calculate the absolute electron temperature profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138044
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Broadband measurement of electron cyclotron emission in TFTR using a quasioptical light collection system and a polarizing Michelson interferometer (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2139-2148 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the past four years, a Fourier transform spectrometer diagnostic system, employing a fast-scanning polarizing Michelson interferometer (FMI), has been operating on the TFTR tokamak at the Princeton Plasma Physics Laboratory. It is used to measure the electron cyclotron emission (ECE) spectrum over the range 2.5–18 cm−1 (75–540 GHz), with a resolution of 0.123 cm−1 (3.7 GHz), at a rate of 72 spectra per second. The quasioptical system for collecting the light and transporting it through the interferometer to the detector has been designed using the concepts of both Gaussian and geometrical optics. The commercial FMI was custom made for this project and is the state of the art for this type of specialized instrument. The diagnostic system is described and an error propagation analysis of the absolute calibration process is given. Examples of ECE spectra measured in two polarization directions are given and electron temperature profiles derived from each of them are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139976
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  • 4
    Electronic Resource
    Electronic Resource
    Twenty-channel grating polychromator for millimeter wave plasma emission measurements (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 889-894 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 20-channel grating instrument based on the Ebert–Fastie grating monochromator has been built to measure electron temperature profiles and electron temperature fluctuations in TFTR (tokamak fusion test reactor). Second-harmonic electron cyclotron emission for the plasma over the frequency range of 120–400 GHz is utilized; this corresponds to a central tokamak magnetic field of 2.9–5 T. System sensitivity is typically 10-eV rms for a 2.5-kHz bandpass with a 2.5-cm radial resolution and a 5-cm antenna spot size at the plasma center. The ratio of the largest to smallest plasma radius observed by the instrument can be as large as 1.65, which maximizes spatial coverage of the plasma. Emission is detected by 20 liquid-helium-cooled indium antimonide hot-electron bolometers mounted in a long hold cryostat. The 6.5-l helium reservoir must be filled every 19 days, while the liquid-nitrogen reservoir is filled automatically once a day. This instrument has about twice the number of channels and much better spatial resolution than other instruments of this type used for plasma diagnostics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140252
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The Role of Oxidative Stress in Signal Transduction Changes and Cell Loss in Senescence (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 738 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb21787.x
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    Paper (German National Licenses)
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