Sub-nanosecond single line-of-sight (SLOS) x-ray imagers (invited)

Abstract

A new generation of fast-gated x-ray framing cameras have been developed that are capable of capturing multiple frames along a single line-of-sight with 30 ps temporal resolution. The instruments are constructed by integrating pulse-dilation electron imaging with burst mode hybrid-complimentary metal-oxide-semiconductor sensors. Two such instruments have been developed, characterized, and fielded at the National Ignition Facility and the OMEGA laser. These instruments are particularly suited for advanced x-ray imaging applications in Inertial Confinement Fusion and High energy density experiments. Here, we discuss the system architecture and the techniques required for tuning the instruments to achieve optimal performance. Characterization results are also presented along with planned future improvements to the design.

Platform for probing radiation transport properties of hydrogen at conditions found in the deep interiors of red dwarfs

“…Two Hohlraum windows allow for measuring the transmission of high density hydrogen using x rays created in a stagnating plasma inside the backlighter tube. Fielding NIF's Crystal Backlighter Imager [52] and the single line-of-sight (SLOS) detector [53] enables us to acquire narrow bandwidth highresolution radiography images of the implosion.…”

“…NIF's Crystal Backlighter Imager (CBI) system [52] will allow for high-resolution, nearly monochromatic radiography images of the imploding and stagnating sphere. A gated single-line-of-sight (SLOS) detector [53] will provide four images per implosion with a time delay of ∼ 100 ps between consecutive images. From the radiography images, we will infer radial profiles of the opacity through Abel inversion [57,58] and forward fitting methods.…”

Recent progress in quantifying hydrodynamics instabilities and turbulence in inertial confinement fusion and high-energy-density experiments

“…This would be challenging, as it requires achieving roughly the 1 μm, 1 ps frontier in a very harsh environment. Both resolution limits could be achieved separately, with Fresnel Zone Plates [183,184] and time dilation detectors [185]. A promising approach has nevertheless emerged recently for HED studies with XFEL [186,187].…”

X-ray framing imaging technique applied in laser fusion

“…混合式磁聚焦透 . CMOS为一种全固体分幅器件, 可以 实现皮秒至纳秒量级的时间分辨率及多分幅成像, 且 具有高空间分辨能力 [51] . 相比于传统真空变像管分幅 相机, X射线CMOS分幅相机具有如下优点: 体积小、 重量轻, 便于和其他光学成像系统集成; 将最外侧绝缘 层去掉后, CMOS芯片可以直接探测电子信号, 便于和 电子脉冲展宽系统等集成; 可实现SLOS技术等 [57] .…”