An aberration-free imaging technique was used to design a double-spherically bent crystal spectrometer with high energy and spatial resolutions to ensure that the individual spectral lines are represented as perfectly...An aberration-free imaging technique was used to design a double-spherically bent crystal spectrometer with high energy and spatial resolutions to ensure that the individual spectral lines are represented as perfectly straight lines on the detector.After obtaining the matched parameters of the two crystals via geometry-based optimization,an alignment method was employed to allow the spacing between the crystals and the detector to be coupled with the source.The working principle of this spectrum-measuring scheme was evaluated using a Cu X-ray tube.High-quality spectra with energy resolutions(E/ΔE)of approximately 3577 were obtained for a relatively large source size.展开更多
The process of high power laser interaction with the large scale length corona plasma produced by the leading edge of the laser pulse has been investigated. Early experimental results are re-analyzed and conclusions d...The process of high power laser interaction with the large scale length corona plasma produced by the leading edge of the laser pulse has been investigated. Early experimental results are re-analyzed and conclusions drawn. In particular,studies of the close connection of unstable filamentation instability with – mainly – two-plasmon decay and – partly –stimulated Raman scattering, stimulated Brillouin scattering, and resonance absorption are carried out in this paper. The positive and negative effects of filamentation instability are also discussed.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.11575168).
文摘An aberration-free imaging technique was used to design a double-spherically bent crystal spectrometer with high energy and spatial resolutions to ensure that the individual spectral lines are represented as perfectly straight lines on the detector.After obtaining the matched parameters of the two crystals via geometry-based optimization,an alignment method was employed to allow the spacing between the crystals and the detector to be coupled with the source.The working principle of this spectrum-measuring scheme was evaluated using a Cu X-ray tube.High-quality spectra with energy resolutions(E/ΔE)of approximately 3577 were obtained for a relatively large source size.
文摘The process of high power laser interaction with the large scale length corona plasma produced by the leading edge of the laser pulse has been investigated. Early experimental results are re-analyzed and conclusions drawn. In particular,studies of the close connection of unstable filamentation instability with – mainly – two-plasmon decay and – partly –stimulated Raman scattering, stimulated Brillouin scattering, and resonance absorption are carried out in this paper. The positive and negative effects of filamentation instability are also discussed.
