134 / 2026-03-31 10:41:16

Pulse-dilation X-ray imager with 4 ps resolution

inertial confinement fusion, x-ray detector, temporal resolution, pulse-dilation

激光与粒子束聚变、磁驱动聚变 > 实验与诊断技术

In the inertial confinement fusion (ICF) experiment, the X-ray image is detected by gated microchannel plate (MCP) based detector with temporal resolution of 35-100 ps. The ICF implosion typically lasts around 100 ps. Therefore, the detailed time history of the burn phase of implosion cannot be captured by such traditional detector. A new detector with better temporal resolution is needed. In this paper, a new X-ray imager is reported by coupling pulse-dilation technique with a traditional detector. This imager uses pulse-dilation of an electron signal from a pulsed transmission photo-cathode (PC) to achieve high temporal resolution. While the PC is not applied with pulse voltage, the measured temporal resolution of the imager without pulse-dilation is about 71 ps. While the excitation pulse is applied on the PC, the measured temporal resolution is improved to 4 ps by using the pulse-dilation technique. The spatial resolution of the dilation X-ray detector is also measured, which is better than 100 μm.