Imaging scattered x-ray radiation for measurement of local electron densityin high-energy-density experiments

摘要

Imaging high-energy-density systems with scattered x-ray photons has several unique characteristicsthat differentiate it from the transmission radiography methods that have traditionally been used todiagnose these experiments. Because x-ray photons scatter primarily from the plasma electrons, thedegree of scattering from any point in a target is roughly proportional to the electron density at thatpoint. By constraining the directions of incident and scattered photons, the scattering event can belocalized, resulting in a point-wise, internal map of the target electron density. Additionally, a scatteringexperiment is not restricted to the collinear source-target-detector geometry of transmission radiog-raphy. This flexibility allows for multiple detectors to image light from a single source, though potentiallyat different scattering angles or energy bands. Presented in this paper is the theoretical underpinning forscattered x-ray imaging, as well as a description of an upcoming proof-of-principle experiment to beconducted at the OMEGA Laser Facility.