K-SHELL RADIATION CHARACTERISTICS OF NEON GAS PUFF Z-PINCHES IMPLODED ON QIANGGUANG-Ⅰ FACILITY
The K-shell radiation characteristics of neon z-pinch plasma with different annular, gas puff nozzles were investigated for implosion times from 70 to 170ns.The experiments were conducted at the 1.6-MA level with a ~60ns risetime on Qiangguang-I facility, whose primary stored electrical energy was about 230 kJ. Assuming a nominal (~10:l) compression ratio, a maximum kinetic energy of 5kJ/cm could be reached according to the 0-D slug models, which would produce very high implosion velocities. For a representative load mass of 10ug/cm, this corresponded to ?~20 neon imploding plasma, so that efficient K-shell emission could be expected.Several load configurations were tested, such as single shell gas puff nozzles with 20-and 25-mm outer diameter, double shell nozzles with 30-mm outer and 10-mm or 15-mm inner diameters. Filtered x-ray diodes, a time-resolved and integrated pinhole camera, and a four-frame gated spectrometer with TAP curved crystal were used to diagnose the liners. The maximum K-shell yield obtained in the experiments was up to ~7kJ with the radiation power of ~280GW and pulse width of 25ns through the use of double shell nozzle.Emission characteristics of all nozzles, including yields, peak powers, pulse widths, and sizes of emitting area, as a function of plenum pressures, would be analyzed and compared with theoretical predictions of the two-level model ( D. Mosher, N. Qi et al. 1998). Temperatures and densities as well as mass fractions of K-shell emitting region were inferred from K-shell line ratios, powers and images, which would provide further insight into how these quantities depended on load conditions.
G.Wu N.Guo T.Huang J.J.Han X.J.Zhang G.W.Zhang K.L.Qiao A.C.Qiu M.Lv L.P.Wang B.Kuai P.T.Cong M.T.Qiu T.S.Lei T.P.Sun
Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Northwest Institute of Nu Northwest Institute of Nuclear Technology,P.O.Box 69-10,Xian 710024,China
国际会议
17th International Conference on High-Power Particle Beams(第17届高功率离子束国际会议)
西安
英文
620-626
2008-07-06（万方平台首次上网日期，不代表论文的发表时间）