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  • 1985-1989  (6)
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  • 1
    Digitale Medien
    Digitale Medien
    Neutron imaging of inertial confinement fusion targets at Nova (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1694-1696 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Images of the neutron-emitting region of high-yield inertial confinement fusion targets have been obtained with a penumbral coded-aperture imaging system. The major components of the imaging system are the penumbral aperture, neutron detector, alignment hardware, and image reconstruction software. We describe these components and present an example of the neutron imaging results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140136
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Neutron emission time measurements for ICF targets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1697-1699 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The neutron emission time for laser-driven inertial confinement fusion targets is determined from data recorded with fast neutron and optical detector systems. Two types of neutron detectors are used. Radiation-induced conductivity devices have a 130-ps FWHM response and are sensitive to targets with yields greater than 5×1010 DT neutrons. They measure the average neutron emission time with a precision of ±50 ps and are fast enough to measure the neutron production rate within a target core as a function of time. Plastic scintillators coupled to microchannel-plate photomultiplier tubes have a 1.2-ns FWHM response and measure the average neutron emission time with a precision of ±75 ps for targets with yields greater than 106 neutrons. Streak cameras record the incident laser power. Optical fiducial signals that are injected into each detector are used to cross time between the detector systems. Measurements made on 1-mm-diam spherical targets irradiated with 23 kJ of 0.35-μm light delivered in a temporally square 1.1-ns pulse and yielding 1013 neutrons show a burn duration greater than 300 ps and an average neutron emission time of about 850 ps.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140137
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  • 3
    Digitale Medien
    Digitale Medien
    Neutron spectroscopy on Nova (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1729-1730 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Some fundamental properties of inertial confinement fusion implosions can be measured using diagnostics based on neutron spectroscopy. An instrument that will measure neutron spectra using time-of-flight techniques with an array of "single-hit'' detectors is being developed for use on Nova. Its initial application will be measurement of ion temperature. Potential other applications, such as measurement of fuel 〈 ρR〉 will also be discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138561
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Zone-plate imaging of neutrons emitted from a laser fusion target (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1803-1803 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Zone-plate coded imaging techniques are routinely used to image nonpenetrating emissions from laser fusion targets. Only highly penetrating radiations like 14-MeV neutrons will escape the dense compressed core region of future targets to provide information about the burn region. A zone plate for 14-MeV neutrons must be several centimeters thick to produce adequate modulation in the coded image. Computer modeling of zone-plate systems show that a thick, tapered zone plate acts like a thin zone plate for points within its field of view and depth of field. Equations developed for thin zone-plate systems that describe quantities such as planar and tomographic resolution may be applied to thick zone-plate systems. System simulations of a 100-zone, 5-cm-thick zone plate with 5-μm outer zone width constructed of alternating layers of gold and aluminum produce images with 10-μm resolution. The source strength required to image a 20-μm-diam source is 100 to 1000 times less than that needed with an equivalent pinhole system. Work performed under the auspices of the U.S. DOE by the LLNL under Contract No. W-7405-ENG-48.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139188
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  • 5
    Digitale Medien
    Digitale Medien
    Approaches to ultrafast neutron detectors (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1096-1097 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We discuss two approaches to obtain neutron detectors of very high temporal resolution. In the first approach, a uranium-coated cathode is used in a streak tube configuration. Secondary electrons accompanying the fission fragments from a neutron-uranium reaction are accelerated, focused through a pinhole, and streaked. Calculations show that 20-ps time resolution can be obtained. In the second approach, a uranium-coated cathode is integrated into a transmission line. State-of-the-art technology indicates that a time resolution of 20 ps can be obtained by gating the cathode with a fast electric pulse.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1138234
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  • 6
    Digitale Medien
    Digitale Medien
    Neutron streak tube (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1749-1750 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We present the design and construction of a simple neutron streak tube. The cathode is a 10-μm-thick U238 strip, 25 mm wide and 1.5 mm high, vacuum deposited on a stainless-steel substrate which replaces the cathode of a Lawrence Livermore National Laboratory (LLNL) model 3 x-ray streak camera. Accompanying a fission fragment, about 200 low-energy secondary electrons are emitted from the cathode. The streak tube was tested at a rotating target neutron source and at the Nova laser which produced 1013 neutrons from the fusion target. Preliminary results are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139170
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