高功率Z-Pinch脉冲源技术的发展

概述了脉冲功率系统中的电容储能、电感储能和磁感应储能技术。基于直线型脉冲变压器（LTD）、电感储能（LES）、等离子体断路开关（POS）以及真空磁绝缘传输线（MITL）技术的低电感、模块化脉冲源将来可能作为基本的子模块应用于超大型高功率Z－Pinch装置。     

Scaling Factor of the Operating Parameters of Z-pinch Liners

Imploding plasma liners in the Z-pinch scheme have been demonstrated to be capable of producing high power radiation in the soft X-ray waveband owing to the conversion of the kinetic energy of imploding liner into thermal energy which in turn is converted into X-ray energy. To obtain largest X-ray power for a certain pulsed-power driving- source, the liner should gain a kinetic energy as great as possible, which imposes an optimal scaling upon the operating parameters of liner in terms of getting largest kinetic energy. This work exposes, by means of numerical calculations based on zero-dimensional quasi-plasma-shell model, the large variation of the scaling factor, which connects the parameters of the initial liner and the driving current, with different driving current waveforms. Also solved in the work is the optimal scaling factor in the sense of producing maximum kinetic energy. Calculations show that maximum kinetic energy is obtained at the current maximum or a little time later. These results ar     

Soft X-ray Images of Krypton Gas-Puff Z-Pinches

A series of experiments has been carried out on Qiang-guang I generator to study the dynamics of krypton gas-puff Z-pinches. The generator was operated at a peak current of 1.5 MA with a rise-time of 80 ns. The specific linear mass of gas liner was about 20 *g/cm in these experiments. In the diagnostic system, a four-frame x-ray framing camera and a pinhole camera were employed. A novel feature of this camera is that it can give time-resolved x-ray images with four frames and energy-resolved x-ray images with two different filters and an array of 8 pinholes integrated into one compact assemble. As a typical experimental result, an averaged radial imploding velocity of 157 km/s over 14 ns near the late phase of implosion was measured from the time-resolved x-ray images. From the time-integrated x-ray image an averaged radial convergence of 0.072 times of the original size was measured. An averaged radial expansion velocity was 130 km/s and the maximum radial convergence of 0.04 times of the original size     

根系吸水模型建立方法研究进展

目前根系吸水速率无法实际测定，为了获取根系吸水模型中的参数，验证分析根系吸水与各影响因子之间的关系，或探索植物利用土壤水分的一般规律，常常需要确定根系吸水速率的时空分布。主要归纳了建立根系吸水速率的不同方法，为建立根系吸水模型提供实际参考价值。     

同轴型场畸变气体火花开关的研制

介绍了为DPF-300型脉冲电流源同步放电系统研制的同轴型场畸变火花开关。通过电场数值计算,对场畸变火花开关的设计进行了验证,对开关的自击穿特性及触发特性进行了实验研究。试验表明,所设计的同轴型三电极场畸变气体火花开关与原DPF-200型所用开关相比,具有电感小、触发特性好等优点,已成功地应用于DPF-300型脉冲电流源的同步放电系统     

Characterization of Cable Gun Plasma with a Charge Collector Array

The density,drift velocity and reproducibility of the plasma produced by a cable plasma gun array have been measured with a charge collector array,The plasma is used to prefill a coaxial plasma-opening switch with a conducting time approaching 0.4us,The reproducibility of the plasma source in subsequent shots is better than 5%.Near the gun nozzle and the opposite electrode,the plasma density amounts to 10^15cm%-3,which is 2 times to 3 times that in the gap between the two coaxial electrodes.A plasma drift velocity of about 2.4cm/μs is observed from the time of flight of the charged particles.Both plasma density and drift velocity increase almost linearly with the rise in charge voltage.     

利用光纤传感器诊断气体开关放电特性的初步研究

介绍了应用两种光纤传感器对气体开关放电进行诊断的方法。相对于传统的电磁测量方法,它更适用于某些特定的场合。试验研究表明,这两种光纤传感器均可以定性反映直流自击穿和触发击穿的开关放电特性,其中,紫外光纤传感器更适合捕捉开关放电的起始时刻。     

用于可调伞形天线的网眼织物的发展

1.引言在美国对于伞形天线结构的深入研究已进行了大约二十年,目的是为了获得较大的反射面。因为在空间轨道上,相对来说具有较小的储存空间,载波系统也只能提供有限的能量。自七十年代中期开始,MBB一直从事伞形反射装置的研制工作,他们对卡尔·迈耶公司采用不同材     

Blumlein型方波发生器中杂散参数对输出方波的影响分析

着重对Blumlein 型方波发生器中几个杂散参数对输出方波前沿及波形的影响进行了详细的分析，从理论上为方波发生器的设计提供了依据。