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  • 1
    Electronic Resource
    Electronic Resource
    Magnets without moments: Spin nematics and beyond (invited) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4974-4978 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin nematics are magnets with long-range tensor order in the absence of a sublattice magnetization; the formation of this novel spin state has been studied within the new quantum fluids perspective of magnetism. Here this recent work on spin nematics is reviewed, and experimental signatures and a candidate system are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348194
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  • 2
    Electronic Resource
    Electronic Resource
    Long-implosion plasma radiation sources using "solid-fill" nozzles (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 533-541 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Solid-fill nozzles for long-implosion Z-pinch experiments to produce argon K-shell x rays (photon energy 〉3.1 keV) have been developed. With a 7 cm diam nozzle, which is appropriate for a 200 ns driver, stable implosions at 180 ns and 4 MA have produced peak argon K-shell yields exceeding 15 kJ. As previously seen with short (∼100 ns) implosion times, the K-shell yield scales as the fourth power of peak current, I4. Limited testing with a 10 cm nozzle, which is appropriate for a 〉250 ns driver, has also achieved a stable implosion. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1333696
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  • 3
    Electronic Resource
    Electronic Resource
    Initial results for an argon Z pinch using a double-shell gas puff (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4223-4226 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent observations are given for an argon double-shell gas puff imploded with up to 4 MA in 200 ns on the Double Eagle generator [G. B. Frazier et al., Digest of Technical Papers, Fourth IEEE Pulsed Power Conference (IEEE, Piscataway, NJ, 1983), p. 583]. Good K-shell x-ray output with good pinch quality was observed. A novel experimental procedure was used to selectively seed the inner or outer gas plenums with a chlorine tracer. The tracer data provide the first direct experimental evidence that the mass initially closest to the axis is the dominant contributor to the hot core of the radiating pinch. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288491
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  • 4
    Electronic Resource
    Electronic Resource
    Efficient argon K-shell radiation from a Z pinch at currents 〉15 MA (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3135-3138 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The first observations of gaseous load implosions with over 15 MA in 〉110 ns on the Z generator [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)] are reported. Starting from a diameter of over 8 cm, an argon double-shell Z pinch imploded to under 0.5 cm K-shell emission diameter. With a load mass of 0.8 mg/cm, K-shell x-ray output reached 274±24 kJ in a 15 TW peak power, 12 ns pulse. This record-high yield is consistent with the current-squared scaling predicted for the "efficient" emission regime. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1373418
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  • 5
    Electronic Resource
    Electronic Resource
    Axially resolved z-pinch density, electron temperature, and K-shell emitting mass estimates from charge-coupled device based diagnostics : 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. 1232-1235 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Timely estimates of z-pinch plasma conditions can aid in the optimization of plasma radiation source K-shell emission. For example, a shell-on-shell argon gas puff has many parameters, such as the axial gas density profile, inner to outer shell mass ratio, total mass, and pinch load length, which can be varied on a shot by shot basis. At the Double-EAGLE facility at Maxwell Physics International, digital cameras have been implemented to routinely record pinhole images, x-ray spectra, and axially resolved streak images. A computer algorithm has been implemented to take as input the data (pinch diameter, Ar Lyα to Heα line ratio, and K-shell power) and output the plasma parameters (density, electron temperature, and K-shell-emitting mass) as a function of z-pinch axial location. We describe the algorithm and present results for three different z-pinch loads. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1324751
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  • 6
    Electronic Resource
    Electronic Resource
    Valve and nozzle design for injecting a shell-on-shell gas puff load into a z pinch (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3080-3084 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a dual-plenum gas valve coupled to a double shell nozzle for the generation of "shell-on-shell" gas loads in z-pinch plasma radiation source experiments. The gas density profiles of the nozzles have been characterized with laser interferometry. This valve/nozzle combination has been successfully fielded on the Double-EAGLE and Saturn pulsed-power generators. The design and characterization of the shell-on-shell valve/nozzle are presented in this article. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1305817
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  • 7
    Electronic Resource
    Electronic Resource
    Enhanced plasma radiation source: Tandem-puff, pinch-on-wire plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3410-3415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe experiments for a neon tandem-puff Z pinch modified with a small-diameter, high-Z wire target (i.e., pinch-on-wire). The radiative yield for photon energies in the range of 1–100 keV is measured. With a copper-wire target the integral yield (J) between 0.9 and 1.5 keV increases by a factor of 1.5 compared to the pinch without a target; the yield is unchanged or slightly increased for higher-Z wires. The high-energy integral yield, above 6 keV, increases by a factor of 2 or more with a copper target and as much as a factor of 5 with a tungsten target. This behavior cannot be accounted for by simple hydrodynamic compression of a hot plasma and suggests yield enhancement by a nonthermal mechanism. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365036
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  • 8
    Electronic Resource
    Electronic Resource
    Diagnostic measurement of ion implantation dose and uniformity with a laboratory-based positron probe (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5988-5992 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The development of a sensitive, depth-tuneable probe, with mapping capability, for low-energy ion implantation dosimetry, is described. The technique is based on the dependence of the extent of Doppler broadening of the positron annihilation linewidth upon the concentration of open-volume defects produced by the implanted ions. By varying the incident positron energy one can ensure that most of the annihilation events occur near the damage peak. A series of diagnostic measurements have been performed which demonstrate that the positron response lies on an almost universal curve, independent of ion mass and energy. The probe is highly sensitive, with a dose threshold in the 10−9 cm−2 range for many implants, and has the potential to measure dose/dose uniformity to better than 1×1011 cm−2 in the 1011−1012 cm−2 range in run times of a few seconds. Considerations underlying the development of a practical instrument based on these findings are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371644
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of accelerating gap geometry on the beam breakup instability in linear induction accelerators (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 997-1008 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron beam in a linear induction accelerator is generally susceptible to growth of the transverse beam breakup instability. In this paper we analyze a new technique for reducing the transverse coupling between the beam and the accelerating cavities, thereby reducing beam breakup growth. The basic idea is that the most worrisome cavity modes can be cutoff by a short section of coaxial transmission line inserted between the cavity structure and the accelerating gap region. We have used the three-dimensional simulation code SOS to analyze this problem. In brief, we find that the technique works, provided that the lowest TE mode cutoff frequency in the coaxial line is greater than the frequency of the most worrisome TM mode of the accelerating cavity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341136
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  • 10
    Electronic Resource
    Electronic Resource
    Two-cavity autoacceleration of an intense relativistic electron beam (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4760-4770 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three series of experiments have been performed using two 40-Ω coaxial autoacceleration cavities to accelerate an intense relativistic electron beam. First, conventional magnetic transport was used to propagate a 1.8-MeV, 11-kA beam through two 1-m-long cavities. An increase of 700±130 keV in kinetic energy was achieved which represents 80% of the maximum theoretical acceleration for an 11-kA beam passing through two 40-Ω cavities. Multiple accelerated pulses were generated and no adverse interaction between the cavities was observed. In the second experiment, ion focused transport (IFT) was used to successfully propagate a 9-kA beam through the accelerator again achieving multipulse operation with both cavities. An energy increase of 560±30 keV was attained which is 78% of the theoretical maximum. Finally, IFT was used to propagate a (approximately-equal-to)25-kA beam through a 1-m-long cavity, then a 0.5-m-long cavity, demonstrating two stages of temporal energy compression. Gap leakage and current transport losses limited the acceleration to 1.25±0.16 MeV which corresponded to an 84% increase in kinetic energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338814
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