Realization of a flat-response photocathode for x-ray streak cameras.

Chuanke Wang,Xin Hu,Shaoen Jiang,Jin Li,Shenye Liu,Zhimin Hu,Gang Jiang,Zhurong Cao,Changqing Xie,Quanping Fan,Bo Deng,Yongkun Ding,Xiaoli Zhu,Tao Yi

doi:10.1364/oe.23.019793

Abstract

We present a novel photocathode which can make x-ray streak cameras to be of a flat spectral response in the x-ray energy range of 0.1-5 keV. The photocathode consists of two layers of gold foils with optimized thickness ratio and structures. The photocathode was calibrated, and it is shown that a flat spectral response has been achieved.

Highlights

X-ray streak cameras (XSC) [1,2,3] are extensively used for ultrafast x-ray diagnostics in the research field of inertial confined fusion (ICF) [4,5,6] as well as in high energy-density physics [7, 8] and fundamental research [9,10,11]
We presented a novel photocathode which can make it possible for XSCs to have a flat spectral response in the x-ray energy range of 0.1-5 keV
The calibration experiments show that the fabricated photocathodes have flat-response with flatnesses better than 9% in the x-ray energy range of 0.1-5 keV

Summary

Introduction

X-ray streak cameras (XSC) [1,2,3] are extensively used for ultrafast x-ray diagnostics in the research field of inertial confined fusion (ICF) [4,5,6] as well as in high energy-density physics [7, 8] and fundamental research [9,10,11]. Conventional XSCs do not have flat spectral response, causing extra complexities to deduce the quantitative information. To obtain the quantitative x-ray spectra, the images measured by XSCs must be corrected using a complex spectral response function of the photocathodes, and this procedure causes sophisticated uncertainties. A flat-response, i.e., energyindependent, photocathode for XSCs is highly required for the quantitative measurements of ultrafast x-ray imaging or spectroscopy. In this paper we present a flat-response photocathode for XSCs in the x-ray energy range of 0.1-5 keV. This type of photocathode does not need complex corrections in the interested x-ray energy range due to the flat-response characteristics. It is a technique to promote the quantitative studies of laser-produced plasmas in ICF research

Design of the flat-response photocathode

Fabrication and calibration of the flat-response photocathode

Findings

Conclusion