Dymoke-Bradshaw A K L, Hares J D, Milnes J, Herrmann H W, Horsfield C J, Gales S G, Leatherland A, Hilsabeck T, Kilkenny J D
Kentech Instruments Ltd., Oxfordshire OX10 8BD, United Kingdom.
Photek Ltd., St Leonards on Sea TN38 9NS, United Kingdom.
Rev Sci Instrum. 2018 Oct;89(10):10I137. doi: 10.1063/1.5039327.
A new ultra-fast photomultiplier tube and associated drivers have been developed for use in the next generation of gamma-ray high pressure gas Cherenkov detectors for inertial confinement fusion experiments at the National Ignition Facility. Pulse-dilation technology has been applied to a standard micro-channel-plate-based photomultiplier tube to improve the temporal response by about 10×. The tube has been packaged suitably for deployment on the National Ignition Facility, and remote electronics have been designed to deliver the required non-linear waveforms to the pulse dilation electrode. This is achieved with an avalanche pulse generator system capable of generating fast arbitrary waveforms over the useful parameter space. The pulse is delivered via fast impedance-matching transformers and isolators, allowing the cathode to be ramped on a sub-nanosecond time scale between two high voltages in a controlled non-linear manner. This results in near linear pulse dilation over several ns. The device has a built-in fiducial system that allows easy calibration and testing with fiber optic laser sources. Results are presented demonstrating the greatly improved response time and other parameters of the device.
一种新型超快速光电倍增管及相关驱动器已被开发出来，用于国家点火装置惯性约束聚变实验的下一代伽马射线高压气体切伦科夫探测器。脉冲扩展技术已应用于基于标准微通道板的光电倍增管，以将时间响应提高约10倍。该光电倍增管已进行了适当封装，以便部署在国家点火装置上，并且已设计了远程电子设备，将所需的非线性波形传输到脉冲扩展电极。这是通过一个雪崩脉冲发生器系统实现的，该系统能够在有用的参数空间内生成快速任意波形。脉冲通过快速阻抗匹配变压器和隔离器传输，使阴极能够在两个高电压之间以受控的非线性方式在亚纳秒时间尺度上进行斜坡上升。这导致在几纳秒内实现近乎线性的脉冲扩展。该装置具有内置基准系统，可使用光纤激光源轻松进行校准和测试。给出的结果证明了该装置的响应时间和其他参数有了极大改善。
