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Outline
It is very important to develop a high time and space resolved velocity diagnostic technique for laser-driven shock wave experiments. However, it is still a difficult problem because of the limited size of laser-launched mini-flyer and ultra-short loading time in shocked sample. Thus, a micro focus Doppler pins system with time resolution of 50 ps and spatial resolution of 200 mm has been developed in our nanosecond laser-driven shock wave experiments, to perform an integrated velocity profile measurement from laser driven mini-flyer to impacted sample. The measured particle velocity of Z-cut quartz sample is 1.27 km/s while the impact velocity of 6 μm-thick Al foil flyer is 2.48 km/s, which is in agreement with the calculated Hugoniot results. This validates our technique. Using our technique, the experimental results for three different types of mini-flyers show that the “substrate/deposit layer/silicone oil/Al foil flyer” structure has higher laser energy coupling efficiency and better integrity. This is valuable for designing a laser-driven shock wave experimental assembly. These results indicate that our technique is a viable approach for studying dynamics of laser-driven shock wave in materials.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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