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  • 1
    Electronic Resource
    Electronic Resource
    Pinhole detection in thin foils used in space plasma diagnostic instrumentation : 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. 4741-4743 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The efficiency of thin foils which are used for charge state modification, start/stop pulse triggering, and UV shielding in space plasma diagnostic instrumentation is highly sensitive to pinholes in the foil. In this study, we present a high resolution method to map pinhole locations and sizes in thin foils based on the different transmission properties of incident ions through holes and hole-free regions of the foil. Results are presented for 200-eV ions transmitted through 0.2-, 0.5-, and 1.0-μg/cm2 carbon foils. Acceleration of transmitted ions into the imaging detector increases both the imaging resolution and the contrast between holes and hole-free regions of the foil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143626
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  • 2
    Electronic Resource
    Electronic Resource
    E(parallel)B energy-mass spectrograph for measurement of ions and neutral atoms : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 292-295 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E(parallel)B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E(parallel)B filter to convert neutral atoms to ions, which are subsequently analyzed using the E(parallel)B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of 3He. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147824
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetospheric plasma analyzer for spacecraft with constrained resources (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1026-1033 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A light-weight, low-power, plasma analyzer is described that can be used for measuring the plasma environments of spacecraft with constrained resources. A unique system using a single electrostatic analyzer coupled to a single array of channel electron multipliers allows measurement of the three-dimensional energy per charge distributions of both ions and electrons over E/q ranges from ∼1 eV/q to (approximately-greater-than)40 keV/q. Particles selected by the analyzer are post-accelerated into the multipliers to maintain sensitivity for the lowest energy particles. An instrument using this concept called the magnetospheric plasma analyzer (MPA) is described. Presently, three MPAs are in geosynchronous orbits (GEO) aboard spacecraft with International Designators of 1989-046, 1990-095, and 1991-080. The MPA and its response characteristics are described, and examples of on-orbit data showing some of the MPA capabilities are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144173
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  • 4
    Electronic Resource
    Electronic Resource
    Channel electron multiplier compatibility with Viton and Apiezon-L vacuum grease (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 2331-2332 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Clean Viton and Viton coated with Apiezon-L vacuum grease were tested for their noncontaminating compatibility with channel electron multipliers (CEMs). The test setup and procedure were the same as those used previously in conjunction with CEM compatibility tests of certain epoxies, solder, and fluorocarbon polymer materials useful for construction of spaceflight sensors. While some CEM gain degradation was noted during exposure to Viton and Apiezon-L, the present tests indicate that, at least over instrument lifetimes of ∼2×1012 counts, these materials should be suitable for (1) preflight space sensor testing systems, (2) hermetic seals for CEM-based space sensors, and (3) terrestrial CEM-based instrumentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139346
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  • 5
    Electronic Resource
    Electronic Resource
    Diagnostics of space plasmas (invited) (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1711-1716 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Diverse plasmas have been observed in the magnetospheres of Earth and other planets, and in interplanetary space. Recently, measurements were made by a space probe at Comet Giacobini–Zinner. In these various plasma regimes investigated during the space era, plasma characteristics vary widely: particle densities range from 〈0.01 to 1000 per cc, energies from 〈1 eV to many MeV, temperatures from 〈1 eV to 〉1000 eV, and bulk flow speeds from near stationary to 〉1000 km/s. A variety of plasma-wave activity and instabilities characterize these plasmas. The measurements are made with several different generic types of instruments including electrostatic analyzers and systems which combine electrostatic analysis with time-of-flight or magnetic analysis in order to identify ions and their charge states. This paper outlines the plasma regimes found in space, discusses instrument design principles and constraints imposed by limited spacecraft resources, describes a few instruments, and highlights a small selection of scientific results derived from diagnostics of space plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138558
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