科研之友
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摘要
Presented are the results of experiments in which jets are created through the collision of two laser-produced plasmas. These experiments use a simple "v-foil" target design: two thin foils are placed at an angle of 140 degrees to each other and irradiated with a high-energy laser. The plasmas from the rear face of these foils collide and drive plasma jets moving with a velocity of similar to 300 km s(-1). By carefully choosing the foil thickness and material to suit the laser conditions available, it has proven possible to create plasma jets for which the relevant scaling parameters show significant overlap with those of outflows associated with young stellar objects (YSOs). Preliminary results are also shown from experiments to study the effect of an ambient gas on jet propagation. Nominally identical experiments are conducted either in vacuum or in an ambient medium of 5 mbar of nitrogen gas. The gas is seen to increase the jet collimation and to introduce shock structures at the head of the outflow.
- 出版日期2008-3-20
- 单位中国地震局
