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Science China Mathematics 2002年第2期45卷 246-254页

作者：彭永伦丁耀南郑志坚韩小英杨家敏李家明 Department of Physics Ctr. Atom. and Molec. Nanosciences Tsinghua University Beijing 100084 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China Inst. of Nucl. Physics and Chemistry CAEP Laboratory for Laser Fusion Mianyang 621900 China

In this paper we present a theoretical method to calculate the absorption spectra of hot dense plasmas. Based on our fully relativistic treatment incorporated with the quantum defect theory to handle the huge number of transition arrays from many configurations with high principal quantum number, we can calculate the absorption spectra for any element or multi-element plasmas with little computational efforts. We calculate the absorption spectra of C10H1605 plasmas, which are in good agreement with the experimental spectra. We can then provide diagnostic analysis for plasmas in relevant inertial confinement fusion (lCF) experiments; namely not only to determine plasmas' temperatures and densities, but also to provide the population densities of various ionic stages. Our theoretical method verified by 'benchmark experiments' will be a basic tool to provide 'precise' opacity data for the ICF research.

关键词： x-ray, plasma, absorption spectra.

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Design,fabrication and characterization of the x-ray supermirrors

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Science China(Physics,Mechanics & Astronomy) 2005年第5期48卷 559-574页

作者： WANG Zhanshan WANG Fengli ZHANG Zhong CHENG xinbin QIN Shuji CHEN Lingyan Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China Institute of Precision Optical Engineering Department of Physics Tongji University Shanghai 20092 China

The design, fabrication and characterization of the x-ray supermirrors are discussed in this paper. Using the local optimization method of simplex algorithm and the global one of simulated annealing algorithm with different initial multilayer structures, we designed the broad angular band supermirrors with different grazing incidence angle intervals at the energy of 8.0 keV (the Kα line of Cu) and the broad energetic band supermirrors with different energy intervals at fixed grazing incidence angles. The fabricating techniques for depositing non-periodic multilayers are also studied. The W/C and W/Si supermirrors are deposited on silicon substrates and characterized by a high resolution x-ray D1 diffractometer from Bede Company, UK. Choosing the interface roughness and the densities of the materials as independent variables, some measured reflectivity curves are fitted using the Debye-Waller factor with interface roughness. The experimental results show that the optical performances of the fabricated supermirrors are in agreement with the designed ones.

关键词： x-ray, supermirror, magnetron sputter, multilayer, reflectivity.

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Solar hard x-rays and gamma-rays

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Science China Mathematics 2002年第Z1期45卷 30-35页

作者：甘为群常进李友平林春梅 Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China

We briefly introduce our recent work on the spectral evolution of energetic protons, the beam property of accelerated electrons, the gamma-ray flare classification, the temporal features of the annihilation line, the ... 详细信息

关键词： solar flare, x-ray, gamma-ray, energetic particle.

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Investigation on non-LTE radiation emitted from a laser-irradiated Au disk

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Science China(Physics,Mechanics & Astronomy) 2005年第3期48卷 345-360页

作者： GU Peijun PEI Wenbing FENG Tinggui WU Changshu Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 China

The spectral character of x-ray emitted from laser-irradiated gold disk is studied by using the one-dimensional non-LTE multigroup radiation transport hydrodynamics code RDMG. The applicability of the “three-temperature” model in which the radiation is described with thermal conduction approximation is checked. The simulation results show that the x-ray emitted from the laser-produced gold plasma is in non-LTE, and that the atom model has significant effect on the structure of x-ray spectrum. However, the plasma states, laser absorption efficiency and x-ray conversion efficiency, which are calculated with the “three-temperature” model, are almost the same as those with non-LTE multigroup radiation transport model. This fact indicates that the “three-temperature” model can be used to study plasma states and the energy distributions produced by a laser-irradiated high-Z target. This is meaningful to the 2-D or 3-D simulation.

关键词： laser-irradiated Au target, the state of plasma, x-ray, non-LTE radiation, atom model.

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Hard x-ray Modulation Telescope(HxMT) Mission

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空间科学学报 2006年第Z1期26卷 30-41页

作者： LI Tipei ZHANG Shuangnan LU Fangjun Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Engineering Physics Tsinghua University Department of Physics Tsinghua University Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

The HxMT mission concept consists of a slat-collimated hard x-ray detector assembly sensitive in 20～250 keV with a collection area of about 5000 cm2. Based on the reconstruction technique by direct demodulation developed in recent years, HxMT is mainly devoted to performing a hard x-ray all-sky imaging survey with both high sensitivity and high spatial resolution. It can also be used to make pointed observations of x-ray sources to study their spectroscopic and temporal properties in details. The main detector of HxMT consists of 18 individual cylindrical NaI(T1)/CsI(Na) phoswich modules, each with anarea of 283.5 cm2 and a field of view of 5.7°× 1.1° (FWHM). Its spatial resolution and position accuracy are 5′ and 1′ by using the direct demodulation in 1994, and in 2000 its feasibility and technical demonstration study was selected as a project under the Major State Basic Research Program of China. In October 2005, this project entered the full design phase and was listed as a candidate for the first dedicated astronomy satellite around 2010. We are now also considering secondary low energy instruments for this satellite.

关键词： Space Astronomy, Hard x-ray, Satellite

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