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  • 1
    Electronic Resource
    Electronic Resource
    A chromogenic limulus test for detection of microbes that decreases the laser damage threshold of potassium dihydrogen phosphate crystals (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4696-4698 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The chromogenic limulus test has been applied for the first time to detect an organic impurity contained in potassium dihydrogen phosphate (KDP) crystals. Impurities arise from microbes present during crystal growth, and are responsible for a reduced laser damage threshold. A sensitivity of 10 pg/g KDP (10−5 ppm) was achieved, provided that the KDP solution was neutralized to ∼pH 7. Endotoxin content in the prismatic region of KDP crystals grown in a microbe-rich solution was approximately 100 pg/g KDP. The presence of an organic material in seemingly perfect KDP crystals could be experimentally confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338384
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  • 2
    Electronic Resource
    Electronic Resource
    Study of a laser-heated electron gun (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4098-4102 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method of cathode heating using a laser was studied for an electron gun. In order to observe the practicality of the heating system, the characteristics of the laser-heated gun with a dispenser and LaB6 thermionic cathodes have been experimentally investigated. The direct laser irradiation is so efficient that the gun is equipped without heat shielding, a cooling system, or an electrical circuit in the gun chamber for cathode heating. Modeling, based on the experimental data, indicates that the cathode temperature is proportional to one-fourth power of the laser power and that laser power loss and conduction loss of heat in the gun assembly are negligible. An electron beam current density 0.48 A/cm2 was measured with 26 W laser power for a dispenser cathode of 0.06 cm2 emission area. Current density 0.16 A/cm2 with 25 W was recorded for a LaB6 cathode of area 0.12 cm2. Electron beam emittance has been measured by using the typical pepper-pot technique. It was observed that the growth of electron beam emittance was very small in the laser heating. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147577
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental study of energy transport in thin Al and Au foils irradiated with a 263-nm laser (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5068-5071 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Irradiating an ultraviolet (uv) laser on aluminum (Al) and gold (Au) thin targets, emissions from the rear side of the targets were temporally resolved. A clear difference was observed between the above two targets. Given the fact that absorbed laser energy can be converted with a very high efficiency to soft x rays in a high-Z plasma, a characteristic emission peak only observed for Au targets was attributed to the effect of soft x-ray energy transport. The observed results were compared with those computed by a one-dimensional hydrodynamic simulation himico. The ablation pressures estimated from the emissions indicate that the pressure scaling for Au is close to the one by x-ray drivers rather than by a uv laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343182
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanism of damage formation in antireflection coatings (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1545-1546 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theoretical interpretation of damage formation in coated optical glasses is given and its low damage threshold is found to be due to the energy confinement in a narrow gap between the glass substrate and the coated material. The experiments supporting this mechanism are conducted with noncoated, hard-coated, and porous-coated glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337290
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  • 5
    Electronic Resource
    Electronic Resource
    Energy confinement effect on soft x-ray generation in 0.53-μm laser-heated cavity target (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2332-2336 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The first experimental investigation has been made of the time-resolved soft x-ray spectra from an empty high Z cavity target irradiated by 0.53-μm wavelength laser. The soft x-ray emission spectra are compared with those from planar targets with respect to temporal and spectral profiles and brightness temperature. Evidence on the radiation confinement and the plasma confinement in the cavity geometry is discussed in conjunction with the energy dissipation flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336330
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  • 6
    Electronic Resource
    Electronic Resource
    Soft x-ray emission from ω0, 2ω0, and 4ω0 laser-produced plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3050-3052 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The soft x-ray spectra from Au plasmas in 0.1–1.6 keV range and x-ray conversion efficiencies of Au (high Z) and Al (low Z) targets with three laser wavelengths of 0.26, 0.53, and 1.05 μm are measured. In addition, the intensity dependence of the x-ray conversion efficiency at 0.26 μm is obtained for Au targets. For 0.26-μm laser light, the conversion efficiency of Au targets can be as high as 80% at an intensity of 2.4×1013 W/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336927
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  • 7
    Electronic Resource
    Electronic Resource
    Light ion beam transport in plasma channels (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2145-2153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport system of intense light ion beams through plasma channels is considered in the reactor system. Channel parameters for the beam transport are determined by diode brightness, pellet requirements, and channel constraints. We considered the desirable reactor parameters and the transportable power window. We have studied most of the single-channel formation by the laser initiation, the beam transport in this channel, and the multiple-channel formation within this window. Uniform and stable plasma channels were formed in 10–40 Torr of ethylene gas by the guidance of the CO2 laser with up to 1-m length. Ion beams were injected to this channel from a pinch-reflex ion diode on the Reiden IV generator. High total transport efficiencies of up to 70% were achieved. Beam orbits, estimated from the post-transported beam pattern on the detector film with energy resolution, were in good agreement with the calculation in the center current mode. We proposed the uniform irradiation reactor channel system using the dodecahedral arrangement so as to satisfy the transportable window constraints. A triple plasma channel was also formed as a simulational model of an overlap channel system. A desirable channel system is expected from experiments and calculations when channels and return paths are alternately arranged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335979
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  • 8
    Electronic Resource
    Electronic Resource
    Enhancement of soft x-ray emission using prepulses with 2ω and 4ω laser plasmas (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1787-1789 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dependence of x-ray emission efficiencies on a plasma volume were obtained for a 527 nm laser with Cu targets and for 263 nm with Cu and Au targets using the same prepulse technique as the one used by Kodama et al. [Appl. Phys. Lett. 50, 720 (1987)]. 4ω results indicate that a maximum of three times increase was observed in soft x-rays(hν=100–200 eV), while no appreciable increase was observed in hard x rays(hν=1–3 keV). From 2ω results, a factor of 2 for the soft x rays and a factor of 3 for the hard x rays were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339922
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  • 9
    Electronic Resource
    Electronic Resource
    Modified crossed-beam apparatus for charge-transfer cross section measurement (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 877-881 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A modified crossed-beam apparatus to measure charge-transfer cross sections of metallic elements in wide impact-energy range (10–1000 eV) has been developed. The ion optics to extract charge-transferred ions from the primary neutral atomic beam was improved, and the background noise due to the collisions on residual gas and the charged particles produced by scattered laser light was reduced, and as the result, the S/N ratio of the charge-transferred ion signal was significantly improved to be (approximately-greater-than)100 at 10 eV impact energy. The reduction of primary ions extracted from the ion source in the atomic beam at low impact energy was compensated for by the improvement of the S/N ratio, and the impact energy for which the cross section can be measured was extended to a lower energy (∼10 eV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144915
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  • 10
    Electronic Resource
    Electronic Resource
    Stimulated Raman scattering in cannonball targets (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3276-3282 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stimulated Raman scattering (SRS) in cannonball targets was experimentally investigated. Above the observed threshold laser intensity, the energy conversion to superhot electrons (E=100–800 keV) shows an increase of five orders of magnitude without saturation. Major differences in observing SRS from cannonball targets and directly driven targets lie in the background electron temperature and the electron plasma density where SRS occurs. A simple model calculation is presented and is compared with the data to infer coronal temperatures. The electron density ranges from 5×1019 to 3×1020 cm−3 and the coronal temperature is 0.2 keV for cannonball targets including cavity targets, while the density ranges from 3×1020 to 6×1020 cm−3 and the temperature is 1 keV for the directly driven target. The generation efficiency of SRS light is strongly correlated with superhot electron generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866504
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