Modelling of picosecond timing signals from fast vacuum photodiodes
Modelling of picosecond timing signals from fast vacuum photodiodes
复制标题
快速真空光电二极管的皮秒定时信号建模
DOI：
10.1016/j.nima.2018.10.069
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Lapington J
中科院分区：
文献类型：
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作者：
Lapington J
在切伦科夫探测器的惯性约束聚变诊断中，使用了上升时间为10皮秒S的甚高带宽真空光电二极管。在英国奥尔德马斯顿原子武器研究所猎户座设施使用非常快的脉冲激光照明对快速Photek PD010光电二极管管的脉冲形状和时间分辨率进行了实验测量，并将其与计算机模型进行了比较，以了解探测器的性能，目的是提高时间分辨率。使用CST Studio Suite软件对确定光电二极管探测器性能的物理过程进行建模。该软件包结合了甚高频电磁场建模、粒子跟踪、空间电荷效应和二次电子发射模拟，并使探测器行为和性能预测能够进行逼真的模拟。我们给出了在器件工作电压范围内时间分辨率和脉冲形状的实验测量结果，并与使用器件CAD设计文件对PD010器件进行精确建模的CST粒子跟踪软件得到的模拟结果进行了比较。这些结果表明，即使在皮秒时间尺度上，实验和模拟之间也可以实现显著的相关性。
Very high bandwidth vacuum photodiodes with 10 s of picoseconds rise time are utilised in Cherenkov detectors for inertial confinement fusion diagnostics. Experimental measurements of the pulse shape and time resolution of a fast Photek PD010 photodiode tube, undertaken using very fast pulsed laser illumination at the ORION facility, Atomic Weapons Establishment, Aldermaston UK, were compared with a computer model to understand detector performance with the aim of improving the time resolution. The physical processes defining the performance of the photodiode detector were modelled using CST Studio Suite software. This package combines very high frequency electromagnetic field modelling, particle tracking, space charge effects and secondary electron emission simulation, and has enabled a realistic simulation of detector behaviour and performance predictions to be made. We present a comparison between experimental measurements of time resolution and pulse shape over a range of device operating voltages, with simulations obtained with CST particle tracking software using the device CAD design file to accurately model the PD010 device. These results demonstrate the remarkable correlation that can be achieved between experiment and simulation, even at picosecond time-scales.