Showing papers by "China Academy of Engineering Physics published in 1992"
TL;DR: In this paper, a double-massive-target coupling was used to achieve significant amplification of five lasing lines with wavelengths (λ) of 19.6, 23.2 and 23.6 nm from 3p-3s transitions in Ne-like Ge ions at an irradiance of 1.2 × 1013 W/cm2 on the axis of an elongated plasma column.
Abstract: By means of a novel experimental design called double-massive-target coupling, significant amplification of five lasing lines was observed with wavelengths (λ) of 19.6, 23.2, 23.6, 24.7, and 28.6 nm from 3p–3s transitions in Ne-like Ge ions at an irradiance of 1.2 × 1013 W/cm2 on the axis of an elongated plasma column. The maximum gain-length product (GL) values achieved were greater than 14 for 2 of the 5 lasing lines at 23.2 and 23.6 nm. Temporally resolved measurements of x-ray laser spectra indicate that the duration of the gain was ~0.8 ns, which is comparable with the Gaussian driving laser pulse width of 1 ns (FWHM) in our experiments. The measured divergence and refraction angles of the x-ray laser beam at 23.6 nm are presented. The dimension and position of the gain region are estimated.
21 citations
Journal Article•
2 citations
01 Jul 1992-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, the authors present the design, construction and experimental results for a hybrid microwiggler with a peak field on axis of greater than 0.35 T with a 5 mm gap.
Abstract: We present the design, construction and experimental results for a hybrid microwiggler. A peak field on axis of greater than 0.35 T is achieved with a 5 mm gap. The experimentally demonstrated tunability of the field amplitude provides a versatile means of field tapering optical klystron configurations, improving field uniformity, and electron beam matching at the wiggler entrance.
2 citations
01 Jan 1992
TL;DR: In this paper, the authors used a two-stage light-gas gun under pressures ranging from 13.4 to 62.2 GPa to study the shock induced crystallization of metallic glass Fe40Ni40P12B8.
Abstract: Shock induced crystallization of metallic glass Fe40Ni40P12B8 has been studied using a two-stage light-gas gun under pressures ranging from 13.4 to 62.2 GPa. The shocked samples were recovered and characterized by the analyses of X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectrum (EDS). The results of the analyses indicate that the crystallization occurs at the edge of the sample at the pressure of 29.3 GPa, and covers the whole sample as the pressure increases to 49.2 GPa. The analyses also show that there are two different structures in the crystallized samples: the fcc type Fe-Ni solid solution and the Fe3P type compound—(Fe,Ni)3(P,B). Furthermore, EDS analysis demonstrates that Fe-Ni solid solution contains different amounts of Fe and Ni in different places for the same crystallized sample, and does so for the (Fe, Ni)3(P,B) compound.
01 Jan 1992
TL;DR: In this paper, a double-target coupling scheme using the LF-12 two beams irradiating oppositely and synchronously was proposed to achieve high gain length products for Ne-like germanium 3p-3s transitions.
Abstract: The laser program at China Academy of Engineering Physics has made remarkable progress in ICF and x-ray laser research during the past few years. Hohlraum physics and imploding hydrodynamics have the priority in experimental investigations. Laser—plasma coupling, x-ray conversion and transport, nonlinear instabilities and suprathermal electrons, and fast ions for a variety of target configuration have been studied and neutron productions by indirect drive have been successfully demonstrated- Furthermore, x-ray laser experiments have been focused on pursueing large gain length products for Ne-like germanium 3p-3s transitions and a gl = 14.6 has been achieved with a proposed double-target coupling scheme using the LF-12 two beams irradiating oppositely and synchronously.