[en] In order to carry out scientific research on the properties of materials under extremely high pressure conditions, a series of laser-driven high pressure loading technology based on Huegoniot, quasi-isentropic compression and 'shock + quasi - isentropic' composite thermodynamic path compression have been developed on 10 kJ-level laser facility. The practical high-pressure loading design method has been established and optimization research on planarity, cleanness of compression wave has been performed. High-pressure state generation capability in wide parameter area which covers from above 10¹¹ Pa of quasi-isentropic compression to above 10¹² Pa of Huegoniot compression has been implemented, which provides an important technical foundation for the study of the high-pressure state equation and phase transition dynamics on the laser device. (authors)

[en] A great of particles and outcome of nuclear reaction will be produced in the measure of nuclear physics experiments, application in nuclear technology and,reaction nuclear physics. In order to obtain the accuracy results of measure and experiments, it will be needed to identify all kinds of particles. The basic principle of several, identification methods in particle identification field will be presented. In the end it gives a brief expectation of particle identification in the future. (authors)

[en] The sweep time performance of the optic streak camera (OSC) is of critical importance to its application. The systematic analysis of full-screen sweep velocity shows that the traditional method based on the averaged velocity and its nonlinearity would increase the uncertainty of sweep time and can not reflect the influence of the spatial distortion of OSC. A elaborate method for sweep time has been developed with the aid of full-screen sweep velocity and its uncertainty. It is proved by the theoretical analysis and experimental study that the method would decrease the uncertainty of sweep time within 1%, which would improve the accuracy of sweep time and the reliability of OSC application. (authors)

[en] The passive diagnostic for radiation driven shock velocity is of critical importance in the research of radiation driven fusion and extreme high-pressure equation of state. Such diagnostic has been set up on SG-Ⅱ and the laser prototype facility. The control technique of signal-to-noise of shock breakout images has been developed based on the theoretical analysis and experimental study which shows that the stray light such as stimulated scattering light is 4 order stronger than the shock light. The precise temporal-resolved technique has also been developed based on the successful application of the faster sweep rate of the streak camera with aids of high-quality light triggering instead of traditional electronic triggering. The developed passive diagnostic has been validated successfully by an experiment whose results show the shock image is clear and the deduced shock velocity is consistent with the calculated one. (authors)

[en] As one of the most important features of CCD, linearity can have great influence on data analysis especially in the region of quantitative calculations. The experimental research on the linearity slope and nonlinear scale of scientific optical CCD related to the application in the ICF field is comprehensively carried out by the maximal deviation method, which shows that the system gain of CCD is dependent on the type of ADC(analog to digital converter) but not on its readout rate and the nonlinear scale is less than 1% when the count is less than 15% of full scale. The calibrated data will be used as the basis of quantitative calculation and analysis related to our ICF research. (authors)

[en] This article introduces the principle of extended X-ray absorption fine structure (EXAFS) as parameter diagnostic method on large laser facilities, as well as the experiments on SG-III prototype facility for high quality EXAFS. Using glass ball, CH capsule and Au ball as backlighters, through multi-shots accumulation method, EXAFS of Ti in ambient condition with good signal-to-noise ratio were obtained. The experiment results coincide well with the results of the synchrotron radiation experiment, indicating the correctness and reliability of the experimental design. Analysis of the results show the factors affecting the EXAFS spectrum quality are photon counts, spectral resolution, noise and flaws on apparatuses. (authors)

[en] Observation of two ion-acoustic waves via Thomson scattering can provide precise measurements of plasma parameters. The conditions for the observation of two ion-acoustic modes in a two-ion plasma are discussed. The ratio of electron temperature T_e to ion temperature T_i is the critical parameter for the presence of two ion-acoustic modes, which should be in the range of 4/Z_L ≤T_e/T_i ≤ 2A_H/Z_HA_L, where Z_L,H are the charge states of light and heavy ions, and A_L,H are the atomic numbers of light and heavy ions, respectively. As the temperature ratio varies in this range, the concentration of heavy ions must increase with the ratio T_e/T_i so that the two ion-acoustic modes can have the same fluctuation levels

[en] In this paper, the active velocity interferometer system for any reflector has been presented to adjust the thickness change. The expansion was calculated under different laser energy and target design. The experiment shows, the expansion is about 2.1 μm under 5 kJ indirect single-ended drive. The thickness change can be obtained after calculating the fringe change. After the optimization of target design in double-ended drive experiment, the step thickness can be achieved accurately with corrected preheat effect on the thickness. The time for shock wave breaking out on the step target can be achieved with the optical stream camera. Under the condition of steady velocity in step target, the shock wave velocity can be gotten from the experiment data. This technique is suitable for the shock wave experiment with radiation drive, and provided the shock wave for equation of state with high accurate. (authors)

[en] In the field of laser fusion, the ablation rate of target material is mainly measured by the diagnostic of thermal wave burn-through images. The planarity of such images could make great influences on the uncertainty of ablation rate. The improvement of the image planarity has been made based on the theoretical and experimental study of the influence of diagnostic spatial resolution. After optimizing the spatial resolution to 29 μm on the 420 eV channel of the diagnostic, we proved with SG-II experiment that the planarity area of thermal wave burn-through image has been increased largely and the fluctuation of thermal wave front is only 4.7 ps which is much less than the temporal measurement uncertainty (about 20 ps) of X-ray streak camera. (authors)

[en] The kinetic features of super hot electrons emitting out of the rear side of metal target is simulated and the reflux is studied by a two-dimension PIC code in cylindrical coordinates. The results show that the emission ratio oscillates when the super hot electron beam is mono-energetic, and the oscillation is smoothed when the electron energy distribution is Maxwellian. (authors)