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  • 1
    Digitale Medien
    Digitale Medien
    Three-dimensional simulation of dye laser amplifiers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1109-1115 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A time-dependent and three-dimensional dye laser amplifier simulation is presented. Its amplified spontaneous emission (ASE) is simulated by distinguishing the propagating directions of the angularly divided ASE, which makes it possible to simulate both the laser and ASE. Strong generation of the ASE is seen from the part of the excited volume where there is no input signal, indicating that ASE greatly depends on the input-beam geometrical profile, as well as its temporal matching with the pumping beam.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351274
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  • 2
    Digitale Medien
    Digitale Medien
    Photoluminescence spectra of p-GaSe doped with Cd (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7936-7938 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Impurity levels in Cd-doped GaSe have been studied by using photoluminescence (PL) measurements. The PL spectra at 77 K are dominated by three new emission bands at 1.95, 1.75, and 1.62 eV. The PL intensity and the peak energy of the 1.95 and 1.62 eV emission bands are measured as a function of the temperature. It is shown that the 1.95 eV emission band is due to the transition between the conduction band and the acceptor level at 0.18 eV above the valence band. The 1.62 eV emission band is caused by the transition from the donor level at 0.37 eV below the conduction band to the acceptor level at 0.13 eV above the valence band. The PL intensity increases with increasing Cd concentration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347488
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  • 3
    Digitale Medien
    Digitale Medien
    Analytical theory of solution of attracting molecules of different size derived from hypernetted-chain equation for radial distribution function (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2075-2083 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The Flory–Huggins formula of mixing entropy of different size molecules originally proved for polymer solution is generally proved for attracting spherical molecules different in size. The Scatchard formula of the excess energy known for application in the solubility parameter is also proved theoretically. The proof is based on analytical solutions of the radial distribution functions for mixture and does not rely on the lattice model. The hypernetted-chain (HNC) equation is perturbed taking hard-sphere system as reference and the attractive force as perturbation. The obtained equation for the perturbed radial distribution function for mixture is solved analytically under simplifying assumptions, which enabled to give the equation of state in analytical form. In order to give the excess Gibbs free energy in explicit form, the vapor pressure of liquid mixture is obtained by applying a phase equilibrium condition corresponding to the Maxwell's equal-area rule to mixture. The excess entropy and enthalpy are derived directly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463145
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  • 4
    Digitale Medien
    Digitale Medien
    Single spatial mode experiments on initial laser imprint on direct-driven planar targets (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1734-1744 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Flat plastic targets were directly irradiated and accelerated by partially coherent light from the GEKKO XII laser [Yamanaka et al., IEEE J. Quantum Electron. QE-17, 1639 (1981)] with the wavelength of 0.53 μm in order to investigate initial laser imprinting. The growth of the perturbation imprinted on the target by an initial foot pulse modulated with a single spatial frequency was observed by the face-on x-ray backlight technique. Imprint levels produced by the foot beam with a stationary intensity modulation of the illumination profile and with a dynamically changing modulation were successfully obtained by an image relay technique and the improved two-wavelength Young's interference method. Simple analytic models are proposed and compared with the experimental results. Stationary imprinting with perturbation wavelength longer than the target thickness is found to be well described by a simple incompressible model. The dynamic dependence of the imprint on the time scale of the temporal illumination profile is found to be qualitatively explained by linear perturbation analysis. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1467656
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  • 5
    Digitale Medien
    Digitale Medien
    Recent results from experiments on x-ray confining cavities (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2813-2813 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In continuation of the collaborative work between the Institute of Laser Engineering, Osaka and Max–Planck-Institut für Quantenoptik, Garching on x-ray confining cavities, we have performed a new series of experiments using the GEKKO-XII laser facility (4 kJ, 0.9 ns, λ=0.35 μm). The results from two experimental objectives will be presented. The first objective was the direct observation of the x-ray confinement effect in a cavity. A special design target allowed the simultaneous measurement of the x-ray flux emanating from a "closed'' cavity and an "open'' cavity. The second objective was the study of radiation transport mechanism in high- and low-Z materials. Thin foils of Au and Al were used as windows on diagnostic holes of x-ray confining cavities and their emission was compared to that of an open hole. A summary of the main results will be presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141839
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  • 6
    Digitale Medien
    Digitale Medien
    Imprint reduction in a plasma layer preformed with x-ray irradiation (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1381-1391 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Indirect–direct-hybrid irradiation scheme has been proposed for suppressing the initial imprint of the laser irradiation nonuniformities. The target is irradiated by a low intensity x-ray radiation prior to the direct-drive laser pulse. The x-ray irradiation generates a plasma expansion layer on the target surface. The thermal smoothing effect is expected to take place in the preformed plasma when the direct-drive laser pulse comes onto the target, and then, the initial imprint can be significantly reduced. Planar target experiments on the indirect–direct-hybrid irradiation scheme were performed. The preformed plasma profile was measured by using x-ray side-on backlighting method. The reduction of the initial imprint was demonstrated by the indirect–direct-hybrid irradiation scheme on planar target experiments. The imprint is suppressed by a factor of 1.5–7 depending on x-ray preirradiation conditions. Results are in good agreement with the cloudy-day model with parameters derived from one-dimensional simulation. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1455629
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  • 7
    Digitale Medien
    Digitale Medien
    Direct-drive hydrodynamic instability experiments on the GEKKO XII laser (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 4079-4089 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Hydrodynamic instabilities, such as the Rayleigh–Taylor (R–T) instability, play a critical role in inertial confinement fusion as they finally cause fuel-pusher mixing that potentially quenches thermonuclear ignition. Good understanding of the instabilities is necessary to limit the mixing within a tolerable level. A series of experiments has been conducted on the GEKKO XII laser facility [C. Yamanaka et al., IEEE J. Quantum Electron. QE-17, 1639 (1981)] to measure hydrodynamic instabilities in planar foils directly irradiated by 0.53 μm laser light. It has been found that (1) the imprint is reasonably explained by an imprint model based on the equation of motion with the pressure perturbation smoothed by the cloudy-day effect, and (2) the experimental R–T growth rate is significantly reduced from the classical growth rate due probably to ablative stabilization enhanced by nonlocal heat transport. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872528
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  • 8
    Digitale Medien
    Digitale Medien
    Progress of fast ignitor studies and Petawatt laser construction at Osaka University : Review,Tutorial and Invited Papers from the 43rd Annual Meeting of the APS Division of Plasma Physics (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 2202-2207 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: 100 TW light from the Petawatt Module (PWM) laser illuminated a preimploded spherical deuterated polystyrene(CD) shell target. The DD neutron yield increased from 2.5×105–106. Analysis indicates that hundreds of keV deuterons, generated around the critical density, collide with cold fuel deuterons and play the leading role in the enhancement of the neutron yield. A two-dimensional particle-in-cell (2D PIC) simulation predicted well the deuteron spectrum. A 60 TW laser was used for MeV proton emissions and megagauss magnetic fields generation on the rear surface of a Poly p-xylene(C8H8) plane target. The 2D PIC simulation explained well the results. The PWM laser was upgraded to one PW, making it the world biggest Petawatt laser (PW laser). An optically parametric chirped amplification was introduced in the front end. The pulse was synchronized to the GEKKO XII imploding beams to within 10 ps. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1458588
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  • 9
    Digitale Medien
    Digitale Medien
    Recent progress of implosion experiments with uniformity-improved GEKKO XII laser facility at the Institute of Laser Engineering, Osaka University (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2077-2083 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The irradiation uniformity of the GEKKO XII laser [C. Yamanaka et al., IEEE J. Quantum Electron. QE-17 1639 (1981)] has been improved by using partially coherent light with angular spectral dispersion and by improving power balance among the beams. Implosion experiments with the uniformity-improved GEKKO XII have been carried out in order to demonstrate stable formation of the hot spark. The isentrope of the compressed pellet shell is controlled by adding a prepulse to enhance the ablative stabilization of the Rayleigh–Taylor instability. The implosion dynamics has been investigated by x-ray imaging and neutron diagnostics. The experimental results are compared with the mix model prediction based on the one-dimensional hydrodynamic simulation. The degradation of neutron yield is attributed to the low-mode asymmetry. Finally, recent results of planer target experiments on the ablative stabilization of the Rayleigh–Taylor instability are also presented. The observed linear growth rate was about 50% of the classical growth rate and was lower than that of the theoretical prediction, based on the Takabe formula combined with the one-dimensional simulation. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872005
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  • 10
    Digitale Medien
    Digitale Medien
    Study of indirectly driven implosion by x-ray spectroscopic measurements (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2063-2074 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Fusion pellet implosion by laser-generated x rays was investigated by means of time-integrated spectroscopic measurements. Deuterium fuel was seeded with a small amount of Ar in order to determine the electron temperature and the density of the compressed fuel from, respectively, the emission intensity ratio and the broadening of the Lyβ (Ar17+1s-3p) and Heβ (Ar16+1s2-1s3p) lines. Comparison of the observed results with volume-averaged temperatures and densities obtained from one-dimensional (1-D) fluid-dynamic simulations showed large discrepancies at maximum compression. One possible explanation is that the fuel is stably compressed until the beginning of pusher deceleration by collision with a reflected shock wave from the pellet center, and that further compression during the deceleration phase is terminated in particular for heavy stagnation cases. Similar results were obtained for fusion output. Experimentally obtained neutron yields were close to those from the 1-D simulations at the beginning of the deceleration but a factor of 10–100 less than those expected at maximum compression. These results were examined in terms of shell disintegration in the acceleration phase and pusher–fuel mixing at the contact surface in the deceleration phase due to growth of initial perturbations of the pellet resulting from fluid instabilities. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871293
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