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  • 1
    Electronic Resource
    Electronic Resource
    Energy gain calculations in Penning fusion systems using a bounce-averaged Fokker–Planck model (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4547-4560 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In spherical Penning fusion devices, a spherical cloud of electrons, confined in a Penning-like trap, creates the ion-confining electrostatic well. Fusion energy gains for these systems have been calculated in optimistic conditions (i.e., spherically uniform electrostatic well, no collisional ion-electron interactions, single ion species) using a bounce-averaged Fokker–Planck (BAFP) model. Results show that steady-state distributions in which the Maxwellian ion population is dominant correspond to lowest ion recirculation powers (and hence highest fusion energy gains). It is also shown that realistic parabolic-like wells result in better energy gains than square wells, particularly at large well depths (〉100 kV). Operating regimes with fusion power to ion input power ratios (Q-value) 〉100 have been identified. The effect of electron losses on the Q-value has been addressed heuristically using a semianalytic model, indicating that large Q-values are still possible provided that electron particle losses are kept small and well depths are large. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310199
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  • 2
    Electronic Resource
    Electronic Resource
    e-beam probe potential diagnostic in spherical electrostatic-inertial plasma confinement (SEIC) (abstract) : 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. 4731-4731 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new e-beam probe is developed to study the potential structure inside a SEIC device [G. H. Miley et al., Fusion Technol. 19, 840 (1991)]. The device has a spherical grid negatively biased inside a spherical vacuum chamber. Ions oscillate through the highly transparent grid, forming a single potential well inside the cathode. The potential in turn attracts electrons from ionization of background gas. The measurement of this complex potential profile is the objective of this work. The e-beam probe offers advantages over the e-emitting probes and the laser heterodyne method. It minimizes perturbations (versus a physical probe) and detects smaller charge density variations than possible with laser techniques. The present e-beam probe utilizes a higher voltage and a modified focus compared to the earlier version used by Swanson [Swanson et al., Phys. Fluids 16, 1939 (1973)]. The characteristic e-beam deflection patterns observed are compared to predictions from an impulse approximation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143622
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  • 3
    Electronic Resource
    Electronic Resource
    Potential profile measurements using a collimated proton detector in spherical inertial-electrostatic plasma confinement : 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. 4810-4812 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A collimated proton detector has been developed for spatial resolved proton measurements in inertial-electrostatic plasma confinement (IEC) fusion experiments. These are the first proton measurements used to infer potential well profiles on an IEC device. This paper describes a new technique for investigating the existence of multiple potential wells inside IEC devices. Analysis of the observed proton energy and source profile indicates that (for a 12-mA cathode current, a 30-kV cathode voltage in a 4-mTorr D2 background) predominantly beam-background fusion occurs. Computer simulation suggests that a positive space charge potential approximately half that of the applied voltage is formed inside the cathode. These results establish the first measurement of a positive potential well structure inside an ion-injected IEC device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143844
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear pumped XeBr* fluorescence (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1900-1908 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental and theoretical results are presented on the nuclear pumping of XeBr*. Measurements under 10B and 3He pumping showed fluorescence efficiencies of 1%±0.5% for the B-X emission. Detailed time-dependent kinetic modeling was not in agreement, with predicted efficiencies of order 8%–9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356981
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma focus wiggler for free-electron laser applications (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2269-2271 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magnetically stabilized plasma focus with controlled modulations has been demonstrated for the first time. A 3-mm-diam plasma focus with two wiggler periods of 1 cm each was kept stable for about 30 ns. Similar configurations with shorter periods could be used as intense wigglers for short-wavelength free-electron lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100250
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental and theoretical studies of nuclear generation of ozone from oxygen and oxygen–sulfur hexafluoride mixtures (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1189-1205 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of experimental measurements of the yield of O3 in nuclear-induced O2 and O2-SF6 discharges are reported. The discharges were created by bombardment with energetic particles from the 10B(n,α)7Li reaction. Continuous irradiation at dose rates of 1015–1017 eV cm−3 s−1 and pulsed irradiation (∼10 ms FWHM) at a peak dose rate of ∼1020 eV cm−3 s−1 were conducted. At the lower dose rates, the addition of SF6 generally increased the ozone yield due to the slowing of ozone destruction by negative oxygen and ozone ions. In contrast, at the high dose rates, the ozone concentration decreased due to SF6 suppression of atomic oxygen formation by ion–ion recombination. A numerical model was developed and tested against experimental conditions. This model indicates that the steady-state ozone concentration was limited by the reaction O−3+O3→2O2+O−2 with a rate coefficient of ∼1×10−12 cm3 s−1. In addition to dose rate effects, pressure and temperature effects on ozone production are discussed and methods for increasing the ozone yield are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337364
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  • 7
    Electronic Resource
    Electronic Resource
    The Structure of Extended Extragalactic Radio Sources (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 18 (1980), S. 165-218 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.18.090180.001121
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  • 8
    Electronic Resource
    Electronic Resource
    Biased probe for plasma diagnostics in spherical electrostatic inertial plasma confinement : Eight topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2902-2904 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The biased probe, as a unique extension of the Langmuir probe, offers several advantages in measuring the charged-particle flux versus position in a beam-dominated plasma such as encountered in the spherical electrostatic inertial confinement (SEIC) device. The probe operates in a non-Maxwellian and locally non-neutral plasma, where the Debye length is large compared to the probe itself. Its conical particle acceptance extension minimizes the measurement error caused by the distortion of the SEIC potential structures. Either the ion or electron flux can be measured using the proper bias on its inner collecting element.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141768
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  • 9
    Electronic Resource
    Electronic Resource
    Optical time-domain reflectometer for ICF burn dynamics (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1537-1537 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new ultrafast all-optical sensor for studies of ICF burn dynamics is described. The sensor measures the change in reflectivity at the interface between two glass plates. The front plate uses uranium-oxide doped silica while the rear plate uses pure silica with an index matching coating. Neutron-induced fissions preferentially change the refractive index of the front plate and the resulting mismatch is measured with a probe laser. A threshold neutron yield requirement of 2×109 is estimated for a sensor with 30 wt. % U-238 doping located 2 mm from the target. A time resolution 〈20 ps is predicted. Further properties and construction details will be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140190
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  • 10
    Electronic Resource
    Electronic Resource
    Fiber sensor neutron streak camera for ICF diagnostics (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1746-1748 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose a new neutron streak camera design for ICF burn studies. It uses a fiber-optic sensor so that the camera itself can be removed from the target chamber. The sensor element is based on the decreased optical transmission (darkening) of a fiber optics doped with fissile material during neutron irradiation. The velocity spread of the neutron pulse requires positioning of any neutron sensor within 5 cm from the target in order to resolve the burn dynamics. A major advantage over other designs is that sensitive and costly components are removed from the intense radiation field. Estimates of minimum yield requirements, darkening time response, and overall temporal resolution are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139169
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