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  • 2000-2004  (2)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Design and fabrication of a vacuum ultraviolet pinhole camera based on thin phosphor screens (abstract) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 952-952 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact and highly sensitive pinhole camera has been developed for acquiring broadband vacuum ultraviolet (VUV) emission profiles of plasmas in the TJ-II. Its principal purpose is to obtain profiles with sufficiently high resolution so as to aid in the search for topological structures in stellarator plasmas. It can also be used to support experiments such as impurity injection by laser ablation. The original and purpose-designed camera reported here provides optimum sensitivity over a broad spectral range. In the camera vacuum chamber, plasma radiation passes through a pinhole and a filter before impinging on a 5×30 mm area of a P-46 phosphor screen. Thin screens of this material were extensively characterized using calibrated monochromatic VUV sources and it was found that their response is maximized when operated in reflection mode.1 Luminescent light emitted from the vacuum side of the screen is then focused by a toroidal mirror (the pinhole is cut in its center) onto the outside of a quartz window which is mounted on the side of camera. Finally, this intermediate image is relayed onto the surface of a gated and intensified linear photodiode array (25 μm by 25 mm) having 700 active pixels. This system is capable of obtaining radial VUV profiles every 12 ms and of recording them in ≥100 ns. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323493
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A multi-channel spectroscopic system for measuring impurity ion temperatures and poloidal rotation velocities in TJ-II : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 971-974 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article, we report on the hardware and software of an eight-channel, high-resolution, spectroscopic diagnostic system that has been built for the TJ-II flexible heliac. This system is currently being used on TJ-II to measure impurity ion temperature and poloidal rotation using passive emission spectroscopy. The principal features of the diagnostic include independent focusing of its channels, high sensitivity for performing Doppler measurements in low-density ECR-heated plasmas, as well as a flexible and fast in-house-developed software program for performing integrated data reduction and analysis. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326008
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The oxygen consuming systems of the liver of mice exposed to simulated high altitude (1981)
    Springer
    International journal of biometeorology 25 (1981), S. 293-297 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Altitude hypoxia does not induce any changes in the enzymatic systems related to oxygen consumption in guinea pigs native of the Peruvian high altitudes. The biochemical changes frequently found in high altitude animals are the result of exposure to the low temperature of this environment rather than to hypoxia. In the present work, mice were chronically exposed to hypobaric hypoxia and maintained at equal temperature as the sea level control group, and measurements of enzymatic activities of the three major oxygen consuming systems of the liver were carried out, i.e., mitochondria, microsomes and peroxisomes. The results obtained have confirmed that hypoxia has no apparent influence on these enzymatic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02198244
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    Paper (German National Licenses)
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