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  • 1
    Electronic Resource
    Electronic Resource
    Study on Zn-, Cd-, or Hg-addition into TlBaCuO (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5289-5292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nominal ZnTlBaCuO4.5, CdTlBaCuO4.5, and HgTlBaCuO4.5 samples have been prepared under different conditions and have been studied by resistance and ac-susceptibility measurements compared to nominal TlBaCuO3.5 samples. In general, the ZnTlBaCuO4.5 samples required less strict heating conditions to reach zero resistance near liquid nitrogen temperature; the CdTlBaCuO4.5 samples had lower Tc; the HgTlBaCuO4.5 samples showed slightly improved Tc at certain conditions. In contrast to La2−xSrxCuO4, Zn-addition did not significantly depress Tc of TlBaCuO. This observation is worthy to be investigated further. Hardness of the ZnTlBaCuO4.5 and CdTlBaCuO4.5 samples was greatly increased, which could have importance in the practical applications of these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347020
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  • 2
    Electronic Resource
    Electronic Resource
    Superconducting TlSr2(Ca,Cr)Cu2O7 thin films with critical current density up to 106 A/cm2 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4259-4261 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting TlSr2(Ca,Cr)Cu2O7 thin films with zero resistance temperature Tc up to 102 K and critical current density Jc as high as 106 A/cm2 at 77.7 K have been successfully prepared via laser ablation and thallium diffusion. Prolonged low temperature annealing in air was used for film processing. X-ray diffraction patterns indicated that the films were highly oriented 1212 phase with c axes normal to the LaAlO3(100) or MgO(100) substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354440
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  • 3
    Electronic Resource
    Electronic Resource
    On electron acceleration by intense laser pulses in the presence of a stochastic field (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 641-644 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron acceleration by intense laser pulses is studied in the presence of a stochastic field representing a background plasma. Electron distributions are generated peaked in the direction of laser propagation and having a quasi-thermal energy spectrum. Effective temperatures are obtained above the ponderomotive energy. They scale with laser intensity I0 and interaction time t0 proportional to I01/2t0α with α(approximate)0.5−1.0. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873347
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  • 4
    Electronic Resource
    Electronic Resource
    Relativistic wave breaking in warm plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 493-495 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A unified description of wave breaking for relativistic plasma waves having arbitrary phase velocity is obtained on the basis of warm relativistic electron fluid theory [Phys. Fluids 25, 846 (1982)]. Limiting cases found in the literature are reproduced. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872116
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  • 5
    Electronic Resource
    Electronic Resource
    Stimulated photon cascade and condensate in a relativistic laser-plasma interaction : The 42nd annual meeting of the division of plasma physics of the American Physical Society and the 10th international congress on plasma physics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2349-2356 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of a linearly polarized relativistic laser pulse in an underdense plasma is studied by fluid-Maxwell and particle-in-cell simulations. A nonlinear interplay between backward and forward stimulated Raman scattering instabilities produces a strong spatial modulation of the light pulse and the down cascade in its frequency spectrum. The Raman cascade saturates by a unique photon condensation at the bottom of the light spectra near the electron plasma frequency, related to strong depletion and possible break-up of the laser beam. In the final stage of the cascade-into-condensate mechanism, the depleted downshifted laser pulse is gradually transformed into a train of ultra-short relativistic light solitons. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356741
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  • 6
    Electronic Resource
    Electronic Resource
    Analytic and numerical study of magnetic fields in the plasma wake of an intense laser pulse (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3764-3773 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic field generation by a laser-induced wakefield is studied in two-dimensional (2D) planar geometry, both analytically and numerically via particle-in-cell (PIC) code simulations. Generally, the magnetic field in the wake is perpendicular to the 2D plane and can be separated into two components: one is independent of time and uniform in the longitudinal (laser propagation) direction; the other depends on time and varies longitudinally. The scaling of magnetic field strength changes from dIL2/dr⊥ at low light intensities to dIL/dr⊥ at high intensities, where IL is the laser intensity and r⊥ the transverse coordinate. Furthermore, the varying component changes from a periodic to a rather complicated structure and tends to increase with the distance from the pulse front. In addition to the quasistatic component, the magnetic field contains a transient component radiating at nearly twice the plasma frequency during the early stage of wakefield buildup. Phase velocities of the wakefield equal to and less than the vacuum speed of light are considered. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872986
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic investigation of the effect of lower hybrid current drive on tearing mode instability (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1226-1230 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effect of lower-hybrid current drive on tearing mode instability is investigated in a drift kinetic formalism. In collisional regime the co-driven current plays a stabilizing role to tearing mode but a destabilizing role to drift tearing mode. A competitive effect among the gradients of density, temperature and driven current at the rational surface may exist. In semicollisional regime, lower hybrid current drive increases the growth rate of tearing mode and reduces the growth rate of drift tearing mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870719
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  • 8
    Electronic Resource
    Electronic Resource
    Particle acceleration in relativistic laser channels (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2847-2854 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Energy spectra of ions and fast electrons accelerated by a channeling laser pulse in near-critical plasma are studied using three-dimensional (3D) Particle-In-Cell simulations. The realistic 3D geometry of the simulations allows us to obtain not only the shape of the spectra, but also the absolute numbers of accelerated particles. It is shown that ions are accelerated by a collisionless radial expansion of the channel and have nonthermal energy spectra. The electron energy spectra instead are Boltzmann-like. The effective temperature Teff scales as I1/2. The form of electron spectra and Teff depends also on the length of the plasma channel. The major mechanism of electron acceleration in relativistic channels is identified. Electrons make transverse betatron oscillations in the self-generated static electric and magnetic fields. When the betatron frequency coincides with the laser frequency as witnessed by the relativistic electron, a resonance occurs, leading to an effective energy exchange between the laser and electron. This is the inverse free-electron laser mechanism. Electrons are accelerated at the betatron resonance when the laser power overcomes significantly the critical power for self-focusing. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873242
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  • 9
    Electronic Resource
    Electronic Resource
    Computer-controlled thermoelectric power measurement for bulk high Tc superconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2263-2267 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have established a quick and easy, modified dc method to measure thermoelectric power for bulk high transition-temperature (Tc) superconductors. The temperature range investigated is from 300 to 50 K. The apparatus was developed on the basis of our already-existing commercial APD (APD CRYOGENICS INC, Allentown, Pennsylvania) superconductor characterization cryostat with a limited amount of extra instrumentation. The thermoelectric power is measured continuously within the temperature range by the control of a computer, a real time Seebeck coefficient S(T) versus temperature curve is plotted on the computer screen during the measurement, and the data can be saved to a disk. The entire processing period for each sample takes less than 2 h. This apparatus was calibrated with pure lead. By measuring on high Tc superconductors which are well known in thermoelectric power, the system has been shown to have high accuracy and reliability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143148
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  • 10
    Electronic Resource
    Electronic Resource
    Flux pinning and motion of high-Jc Tl(2223) Ag-sheathed tapes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1658-1661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of resistance on temperature has been measured for a Tl-system 2223-phase Ag-sheathed tape with Jc(Jc=1.5×104 A/cm2, 77 K, 0 T) in an applied magnetic-field range from 0 to 0.8 T. The experimental results can be explained in terms of the thermally activated flux creep model. The relationship between pinning potential U0 and the applied magnetic field H oriented parallel to and perpendicular to the tape surface is, respectively, U0(parallel)=0.12H−0.22 eV and U0⊥=0.065H−0.35 eV. The relationship between pinning potential U and T follows: U(T,H)=U0(H)(1−t) (t=T/T0,T0=141 K). When H and the measuring current I are laid in the same tape surface, the broadened resistive transition is independent of the configuration between H and I, namely, an energy dissipation is independent of a macroscopic Lorentz force. The phenomenon is accounted for according to the two-dimensional pancakelike vortex-antivortex model based on the characteristic of a stronger intrinsic plane pinning of layer superconductors. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358923
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