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  • 1
    Electronic Resource
    Electronic Resource
    Soft x-ray spectra of highly ionized elements with atomic numbers ranging from 57 to 82 produced by compact lasers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1923-1930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray emission spectra in the spectral range of 2–13 nm from 19 kinds of material with high atomic numbers (lanthanum through lead) were recorded with a grazing incidence spectrometer equipped with a microchannel plate detector. There is an intense, narrow spectral band in these spectra which shifts toward shorter wavelength and becomes weak in intensity with increasing atomic number. The materials were irradiated either by a 4 J/35 ns slab Nd:glass laser or by a 0.5 J/8 ns Nd:YAG laser. The absolute photon intensities of the spectra were determined with an absolutely calibrated charge coupled device camera. The peak spectral brightness of the emission at the peak intensity of the spectral band for lanthanum plasma was estimated to be 2.1×1016 photons/s/mm2/mrad2 in 0.1% bandwidth. The origin of the narrow, intense spectral bands in the recorded spectra and their dependence on target materials and laser wavelength are interpreted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356339
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature mapping of compressed fusion pellets obtained by monochromatic imaging : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 734-736 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report the first use of toroidally bent crystals to record two-dimensional, spatially resolved, monochromatic images of laser-produced fusion plasma. The electron temperature was determined by seeding the deuterium fuel with argon and evaluating the intensity ratio of the two monochromatic images in the Ar+ 17Ly β and the Ar+ 16He β lines. Silicon and germanium crystals were chosen to achieve high diffraction reflectivities. Spatial resolution better than 10 μm was achieved by bending the crystals toroidally to minimize the geometrical aberrations [E. Förster, K. Gäbel, and I. Uschmann, Laser Particle Beams 9, 135 (1991)]. Comparison of the two line intensities requires a calibrated imaging system. Monochromatic images of fusion pellets driven with the GEKKO XII glass laser system are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146273
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  • 3
    Electronic Resource
    Electronic Resource
    Cryostat to provide a solid deuterium layer in a plastic shell for the Gekko XII glass laser system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3378-3383 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A system to provide a liquid or solid deuterium shell target with a plastic ablator for laser implosion experiments was developed. The system is capable of filling a plastic capsule with deuterium gas of 11 MPa at room temperature at the firing position in the target chamber. Then, the target is cooled down to a cryogenic temperature to form a uniform liquid or solid fuel layer inside without exposing it to the atmosphere. Details of the system, tensile strength of polystyrene shells at low temperature, and the residual vapor pressure in the central void of the target at the laser irradiation are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142555
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  • 4
    Electronic Resource
    Electronic Resource
    A highly efficient neutron time-of-flight detector for inertial confinement fusion experiments : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1221-1224 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed the highly efficient neutron detector system MANDALA for the inertial-confinement-fusion experiment. The MANDALA system consists of 842 elements plastic scintillation detectors and data acquisition electronics. The detection level is the yield of 1.2×105 for 2.5 MeV and 1×105 for 14.1 MeV neutrons (with 100 detected hits). We have calibrated the intrinsic detection efficiencies of the detector elements using a neutron generator facility. Timing calibration and integrity test of the system were also carried out with a 60Co γ ray source. MANDALA system was applied to the implosion experiments at the GEKKO XII laser facility. The integrity test was carried out by implosion experiments. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149430
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  • 5
    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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  • 6
    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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  • 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
    Line x-ray emissions from highly ionized plasmas of various species irradiated by compact solid-state lasers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 3355-3362 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray emissions in the spectral range of 2–13 nm from 21 kinds of material (carbon through tin) irradiated either by a 4 J/35 ns slab Nd:glass laser or by a 0.5 J/8 ns Nd:YAG laser were recorded with a grazing incidence spectrometer equipped with a microchannel plate detector. The absolute photon intensities of the spectra from these materials were determined. The variation of the molybdenum spectrum with laser irradiance was also investigated. Finally, the spectra ranging from 2 to 13 nm produced by the Nd:YAG laser of both the fundamental (1.06 μm) and its second-harmonic (0.53 μm) wavelengths are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351457
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  • 10
    Electronic Resource
    Electronic Resource
    Measurement and detail analysis of gain on balmer-alpha line of hydrogen-like carbon in wall-confined CO2 laser-produced plasmas (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4189-4195 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A 1-cm-long hollow parylene (C8H8) cylinder-type target was irradiated with a long pulse CO2 laser (400 J/50 ns) to produce a confined soft x-ray laser source. The amplification of the Balmer-alpha line (182.2 A(ring)) of the H-like carbon was observed using two different gain determination methods. The time- and space-integrated gain coefficient up to 2.2(+0.6/−1.1)cm−1 was obtained from the ratio of the axial to transverse line intensity. By using the C8H7Cl target, the gain coefficient increased up to 2.8(+0.6/−1.1)cm−1, inferring the radiative cooling effect. The experimental results agreed with the simulation results within a factor of 5. By reducing the cylinder mass by a factor of 20, the simulation result gave the long gain duration up to 20 ns in FWHM and large gain region up to 1.3 mm in radius.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348387
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