PLADIS I等离子枪的脉冲功率诊断

J. Bradley, J. Gahl, S. Suzuki, P. Rockett, J. Hunter
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引用次数: 2

摘要

美国新墨西哥大学正在使用PLADIS I等离子体枪系统进行托卡马克破坏模拟实验。PLADIS I是一种高功率、高能量的同轴等离子体枪,配置用于产生强烈的等离子体束。通过调整PLADIS I枪电路的电感和电容,可产生全宽半最大值(FWHM)时间为100 /spl mu/s的电流脉冲。候选材料被放置在光束路径中,以确定它们在破坏相关能量密度下的响应。各种诊断方法已被用来确定入射等离子体和蒸汽屏蔽等离子体的特性。使用日本原子能研究所提供的量热计阵列来确定阵列材料中沉积的能量密度分布。在蒸汽屏蔽等离子体变厚并遮蔽表面之前,使用快速双色光学高温计测定样品的表面温度作为初始等离子体/表面相互作用期间时间的函数。使用市售的快速响应聚偏氟乙烯压力传感器建立了时间分辨目标表面压力诊断,并用于确定等离子体压力脉冲作为位置和时间的函数。该诊断关于等离子体光斑大小和脉冲宽度的数据与其他诊断结果进行比较。压力诊断的初步结果与表面温度的上升时间和喷枪电流脉冲的FWHM时间吻合得很好。进一步给出了PLADIS I中总吸收能量、时间分辨目标表面温度和时间分辨目标表面压力随入射功率和能量的函数关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pulsed power diagnostics on the PLADIS I plasma gun
Tokamak disruption simulation experiments are being conducted at the University of New Mexico (USA) using the PLADIS I plasma gun system. PLADIS I is a high power, high energy coaxial plasma gun configured to produce an intense plasma beam. The inductance and capacitance of the PLADIS I gun circuit are adjusted to produce a current pulse with a full width half max (FWHM) time of 100 /spl mu/s. Candidate materials are placed in the beam path to determine their response under disruption relevant energy densities. Various diagnostics have been used to determine the characteristics of the incident plasma and the vapor shielding plasma. Calorimeter arrays provided by the Japan Atomic Energy Research Institute were used to determine the profile of energy density deposited in the array material. A fast, two color optical pyrometer was used to determine the surface temperature of the sample as a function of time during initial plasma/surface interaction, before the vapor shield plasma becomes optically thick and obscures the surface. A time resolved target surface pressure diagnostic using a commercially available, fast response polyvinylidine fluoride pressure sensor has been built and is used to determine the pressure pulse of the plasma as a function of position and time. Data from this diagnostic regarding plasma beam spot size and pulse width are compared to results from other diagnostics. Initial results from the pressure diagnostic agree very well with the risetime of the surface temperature and the FWHM time of the gun current pulse. Further results regarding total absorbed energy, time resolved target surface temperature and time resolved target surface pressure in PLADIS I as a function of incident power and energy are presented.
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