The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform

Robert Shrock - One of the best experts on this subject based on the ideXlab platform.

Toshimasa Morita - One of the best experts on this subject based on the ideXlab platform.

  • Proton Energy Behavior by variation of the target density in laser acceleration
    Physics of Plasmas, 2017
    Co-Authors: Toshimasa Morita
    Abstract:

    Ion acceleration using a laser pulse irradiating a thin disk target is examined using three-dimensional and two-dimensional particle-in-cell simulations. A laser pulse of 620 TW, with an intensity of 5×1021 W/cm2 and a duration of 27 fs, is irradiated on to a double-layer target. Simulations are performed by varying the ion density, i.e., electron density, of the first layer with a fixed areal mass density. It is shown that the obtained proton Energy increases dramatically for a certain density of the first layer, which is made of a material having a small mass over charge ratio, “light” material, such as carbon; that is, the Coulomb explosion of the target and radiation pressure acceleration act effectively above a certain density. Moreover, even for the same electron density, the reflection of the laser pulse from the first layer is small for a “light” material.

  • Proton Energy Behavior by variation of the target density in laser acceleration
    arXiv: Plasma Physics, 2017
    Co-Authors: Toshimasa Morita
    Abstract:

    Ion acceleration using a laser pulse irradiating a thin disk target is examined using three-dimensional and two-dimensional particle-in-cell simulations. A laser pulse of $620$ TW, with an intensity of $5\times 10^{21}$ W/cm$^{2}$ and a duration time of $27$ fs is irradiated on a double-layer target. Simulations are performed by varying the ion density, i.e., electron density, of the first layer. It is shown that the obtained proton Energy jumps at a certain density of the first layer, which is made of a "light" material such as carbon; that is, Coulomb explosion of the target and radiation pressure acceleration act effectively above a certain density. Moreover, even at the same electron density, the reflection of the laser pulse from the first layer is small for a "light" material.

Shmuel Nussinov - One of the best experts on this subject based on the ideXlab platform.

Akio Sugamoto - One of the best experts on this subject based on the ideXlab platform.

  • High-Energy Behavior of the membrane scattering amplitudes
    Computer Physics Communications, 1993
    Co-Authors: Sachiko Kokubo, Akio Sugamoto
    Abstract:

    Abstract High-Energy Behavior of the membrane scattering amplitudes is studied for two-body, fixed-angle, scattering processes. With the saddle point method, estimation of the amplitudes is performed under the assumption that the world volume appearing in the intermediate stage of the scattering is the simple S3 or T3. By taking the first case of sphere S3, analytical estimation of the amplitude is possible, whereas in the latter case of torus T3, numerical analysis is necessary with the help of the Ewald method developed in crystal physics and Monte Carlo simulated annealing. The appearance of effects like structural phase transition is suggested for the membrane scattering amplitudes under the change of the scattering angle.

Yoshihisa Kitazawa - One of the best experts on this subject based on the ideXlab platform.

  • High Energy Behavior of Wilson lines
    Journal of High Energy Physics, 2001
    Co-Authors: Avinash Dhar, Yoshihisa Kitazawa
    Abstract:

    We investigate the high Energy Behavior of the correlation functions of the open Wilson lines in non-commutative gauge theory. We obtain a very simple physical picture that they are bound to form a group of closed Wilson loops. We prove our claim in the weak coupling region by perturbative analysis. We emphasize the importance of respecting the cyclic symmetry of the straight Wilson lines to compute the correlation functions. The implications for stringy calculation of the correlators are also discussed.