Post-acceleration internal enhancement technology for streak camera and its nonlinear intensity correction

Abstract

To achieve high dynamic range performance in X-ray streak cameras and precision diagnostics, the theory of post-acceleration internal gain technology in streak cameras is investigated from photon density detection threshold. The reduction of threshold limited by system sensitivity is beneficial for expanding the dynamic range. The streak camera incorporating post-acceleration internal gain technology is designed and an ultra-fast laser calibration system is established. Experiments show that the camera's dynamic range reaches 2 578∶1. Compared to microchannel plate internal gain technology with the saturation effects, the technology significantly expands the dynamic range performance. The nonlinear sources of signal intensity on the screen are identified by the different transmittance of electrons with different directional angles, and the intensity error distribution in the imaging area and its correction methods are provided. The dynamic range error is 7.7% compared with the uncorrected one. The system structure of the post-acceleration internal enhancement technology is compact, which is conducive to improving the dynamic range of the streak camera, and helps to realize the goal of quantitative measurement and precision diagnosis of laser driven inertial confinement fusion in China.

Keywords

• optoelectronics and laser technology
• nuclear instrumentation
• inertial confinement fusion
• streak camera
• post-acceleration technology
• dynamic range