The thin aluminum liners with an aspect ratio R/?r 1 have been imploded on the primary test stand(PTS) facility,where R is the outer radius of the liner and ?r is the thickness. The x-ray self-emission images present ...The thin aluminum liners with an aspect ratio R/?r 1 have been imploded on the primary test stand(PTS) facility,where R is the outer radius of the liner and ?r is the thickness. The x-ray self-emission images present azimuthally correlated perturbations in the liner implosions. The experiments show that at-10 ns before the stagnation, the wavelengths of perturbation are about 0.93 mm and 1.67 mm for the small-radius and large-radius liners, respectively. We have utilized the resistive magnetohydrodynamic code PLUTO to study the development of magneto-Rayleigh–Taylor(MRT) instabilities under experimental conditions. The calculated perturbation amplitudes are consistent with the experimental observations very well. We have found that both mode coupling and long implosion distance are responsible for the more developed instabilities in the large-radius liner implosions.展开更多
The transverse construction of optical modes in the wiggler is calculated and the numerical simulations of the free-electron laser hole-coupled resonator are carried out.These 3D-simulations include optical amplitude ...The transverse construction of optical modes in the wiggler is calculated and the numerical simulations of the free-electron laser hole-coupled resonator are carried out.These 3D-simulations include optical amplitude distributions,modes evolvement of optical field and the influence of hole-radius on the distributing of modes.The nu-merical simulations confirm that the fraction of the even-order modes increase in the start-up stage and then decreases in the exponential gain stage.Moreover,it is found that the fundamental mode is dominant in the saturate stage.Based on this observa-tion,we estimate the optical output coupling by using the the fundamental mode.It is found that the numerical results and the first-order estimate are in good agreement for a range of the hole size.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11605013,11775032,11805019,and 11705013)
文摘The thin aluminum liners with an aspect ratio R/?r 1 have been imploded on the primary test stand(PTS) facility,where R is the outer radius of the liner and ?r is the thickness. The x-ray self-emission images present azimuthally correlated perturbations in the liner implosions. The experiments show that at-10 ns before the stagnation, the wavelengths of perturbation are about 0.93 mm and 1.67 mm for the small-radius and large-radius liners, respectively. We have utilized the resistive magnetohydrodynamic code PLUTO to study the development of magneto-Rayleigh–Taylor(MRT) instabilities under experimental conditions. The calculated perturbation amplitudes are consistent with the experimental observations very well. We have found that both mode coupling and long implosion distance are responsible for the more developed instabilities in the large-radius liner implosions.
文摘The transverse construction of optical modes in the wiggler is calculated and the numerical simulations of the free-electron laser hole-coupled resonator are carried out.These 3D-simulations include optical amplitude distributions,modes evolvement of optical field and the influence of hole-radius on the distributing of modes.The nu-merical simulations confirm that the fraction of the even-order modes increase in the start-up stage and then decreases in the exponential gain stage.Moreover,it is found that the fundamental mode is dominant in the saturate stage.Based on this observa-tion,we estimate the optical output coupling by using the the fundamental mode.It is found that the numerical results and the first-order estimate are in good agreement for a range of the hole size.
