物理学报2011，Vol.60Issue(1)：410-421,12.
双层喷气Z箍缩氖等离子体K层辐射研究
Study on K-shell X-ray production of double-shell neon gas puff Z-pinch
摘要
Abstract
The main results of investigation on K-shell X-ray production of double-shell neon gas puff Z-pinch, driven by Qiangguang-Ⅰ facility ( 1.6 MA, 70 ns), are reported. The exit radii of the outer and inner shells are 1.5-1.4 cm and 0. 75-0.6 cm, respectively. Both shells have a throat width of 0. 32 mm, while the ratio of the throat radii is 2.8: 1, to which the mass ratio would be approximately equal for identical plenum pressures. K-shell yield and peak power up to 7 kJ and 0.28 TW, respectively, for a 20 ns full width at half maximum pulse have been obtained with about 120 ns implosions, the load mass per unit length of which are estimated to be 60-70 μg/cm. Time-resolved X-ray images show that RT instability during the implosion stage has been well suppressed, resulting in a final pinch diameter compressed to less than 2.5 mm. The final implosion velocity exceeds 25 cm/μs. K-shell yields and peak powers are largely reduced with longer implosion time. For shots with lower mass, i.e. 28-63 μg/cm, the electron temperature inferred from timegated K-shell spectra should be greater than 500 eV, implying an overheated plasma column being formed in the stagnation stage. While for shots with load mass of 72-80 μg/cm, time resolved electron temperatures are in the range of 300-400 eV. The inferred ion densities of the K-shell emitting region are in the range of ( 3-9 ) × 1019 cm-3, which have been used to calculate the mass fractions that contribute to K-shell radiation. Those shots with near 7 kJ yields also have maximum K-shell emitting load mass ( about 46 μg/cm).关键词
双层喷气/Z箍缩等离子体/K层辐射/雪耙内爆Key words
double-shell gas puff/ Z-pinch plasma/ K-shell X-ray radiation/ snowplow implosion引用本文复制引用
吴刚,邱爱慈,王亮平,吕敏,邱孟通,丛培天..双层喷气Z箍缩氖等离子体K层辐射研究[J].物理学报,2011,60(1):410-421,12.基金项目
国家自然科学基金(批准号:10635050和10475065)资助的课题. （批准号:10635050和10475065）
