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MA-class linear transformer driver forZ-pinch research
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 
F. Conti, J. C. Valenzuela, V. Fadeev, N. Aybar, D. B. Reisman, A. Williams, G. Collins IV, J. Narkis, M. P. Ross, F. N. Beg, R. B. Spielman

A Linear Transformer Driver (LTD) generator capable of delivering up to 0.9 MA current pulses with 160 ns rise time has been assembled and commissioned at UC San Diego. The machine is an upgrade of the LTD-III pulser from Sandia National Laboratories, consisting of 40 capacitors and 20 spark gap switches, arranged in a 20-brick configuration. The driver was modified with the addition of a new trigger system, active pre-magnetization of the inductive cores, a vacuum chamber with multiple diagnostic ports, and a vacuum power feed to couple the driver to plasma loads. The new machine is called Compact Experimental System for Z-pinch and Ablation Research (CESZAR). The driver has a maximum bipolar charge voltage of $$100 kV, but for reliability, testing, and to reduce the risk of damage to components, the machine was operated at $$60 kV, producing 550~kA peak currents with a rise time of 170 ns on a 3.5 nH short circuit. While the peak current is scaled down due to the reduced charge voltage, the pulse shape and circuit parameters are close to the results of the cavity and power feed models, but suggest a slightly higher inductance than predicted. The machine was then used to drive wire array Z-pinch and gas puff Z-pinch experiments as initial dynamic plasma loads. The evolution of the wire array Z-pinch is consistent with the general knowledge of this kind of experiments, featuring wire ablation and stagnation of the precursor plasma on axis. The gas puff Z-pinches were configured as a single, hollow argon gas shell, in preparation for more structured gas puff targets such as multi-species, multi-shell implosions. The implosion dynamics agree generally with 1-D MHD simulation results, but large zippering and magneto-Rayleigh-Taylor instabilities are observed. The CESZAR load region was designed to accommodate many load types to be driven by the machine, which makes it a versatile platform for studying Z-pinch plasmas. The completion of the CESZAR driver allows plasma experiments on energy coupling from LTD machines to plasma loads, instability mitigation techniques and magnetic field distributions in Z-pinches, and interface dynamics in multi-species implosions.

中文翻译:

用于Z捏研究的MA级线性变压器驱动器

在加州大学圣地亚哥分校组装并调试了一种线性变压器驱动器(LTD)发生器,该发生器能够在160 ns的上升时间内提供高达0.9 MA的电流脉冲。该机器是桑迪亚国家实验室(Sandia National Laboratories)的LTD-III脉冲发生器的升级版,该脉冲发生器由40个电容器和20个火花隙开关组成,并以20砖的配置布置。对驱动器进行了修改,增加了新的触发系统,感应铁芯的主动预磁化,带有多个诊断端口的真空室以及将驱动器耦合到等离子负载的真空电源。这种新机器称为Z捏和消融研究的紧凑型实验系统(CESZAR)。该驱动器的最大双极充电电压为$ 100 kV,但是为了可靠性,测试以及降低组件损坏的风险,该机器以$ 60 kV运行,550在3.5 nH短路时,峰值电流为〜kA,上升时间为170 ns。尽管峰值电流由于充电电压的降低而按比例缩小,但脉冲形状和电路参数与腔体和功率馈送模型的结果接近,但建议电感比预期的稍高。然后将机器用于驱动线阵列Z捏和气体Z捏实验,以作为初始动态等离子负载。线阵列Z型捏的演变与此类实验的常识相一致,其特征是线烧蚀和前驱体等离子体在轴上停滞。吹气Z形夹点配置为单个空心氩气壳,为更结构化的吹气目标(如多物种,多壳内爆)做准备。内爆动力学通常与一维MHD仿真结果一致,但观察到较大的拉链和磁瑞利泰勒不稳定性。CESZAR负载区域旨在适应机器要驱动的多种负载类型,这使其成为研究Z捏合等离子体的多功能平台。CESZAR驱动程序的完成允许进行从LTD机器到等离子体负载的能量耦合,Z夹中的不稳定性缓解技术和磁场分布以及多物种内爆中的界面动力学的等离子实验。
更新日期:2020-08-17
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