土星辐射输出比例与机器设计参数的估计

K. Struve, T. Grabowski, N. Joseph, B. Oliver, M. Savage, B. Ulmen, P. Vandevender
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引用次数: 1

摘要

土星是一种短脉冲(~ 40 ns FWHM) x射线发生器,能够在能量为1至2兆电子伏的情况下,向轫致辐射二极管提供高达10毫安的能量,每次发射产生高达5 × 10^12 rad/s (Si)。随着机器现在超过30年的历史,有必要重建和更换许多组件,升级控制和诊断,设计更高的可靠性和可重复性,并且,尽可能升级加速器以在低电压(~ 1 MV或更低)下产生更大的电流。因此,有必要重新评估机器的设计参数。当峰值电压、驱动阻抗和真空电感变化时,机器被建模为一个简单的LR电路,由等效的正弦平方驱动波形驱动。每一种变化对真空绝缘体电压、二极管电压、二极管阻抗和辐射输出都有影响。为了本研究的目的,辐射被缩放为二极管电流乘以二极管电压上升到2.7的功率。给出了参数扫描的结果,并用于开发优化辐射输出的设计。结果表明,为了保持现有的短脉冲长度而增加输出,在比原设计更高的阻抗下工作是最有利的。还讨论了需要进行的关键改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimates of Saturn Radiation Output Scaling versus Machine Design Parameters
Saturn is a short-pulse (~ 40 ns FWHM) x-ray generator capable of delivering up 10 MA into a bremsstrahlung diode to yield up 5 × 10^12 rad/s (Si) per shot at an energy of 1 to 2 MeV. With the machine now over 30 years old it is necessary to rebuild and replace many components, upgrade controls and diagnostics, design for more reliability and reproducibility, and, as possible upgrade the accelerator to produce more current at a low voltage (~ 1 MV or lower). Thus it has been necessary to reevaluate machine design parameters. The machine is modeled as a simple LR circuit driven with an equivalent a sine-squared drive waveform as peak voltage, drive impedance, and vacuum inductance are varied. Each variation has implications for vacuum insulator voltage, diode voltage, diode impedance, and radiation output. For purposes of this study, radiation is scaled as the diode current times the diode voltage raised to the 2.7 power. Results of parameter scans are presented and used to develop a design that optimizes radiation output. Results indicate that to maintain the existing short pulse length of the machine but to increase output it is most beneficial to operate at an even higher impedance than originally designed. Also discussed are critical improvements that need to be made.
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