Abstract
A diagnostic capable of recording spatially and temporally resolved x-ray self-emission data was developed to characterize experiments on the MAGPIE pulsed-power generator. The diagnostic used two separate imaging systems: a pinhole imaging system with two-dimensional spatial resolution and a slit imaging system with one-dimensional spatial resolution. The two-dimensional imaging system imaged light onto the image plate. The one-dimensional imaging system imaged light onto the same piece of image plate and a linear array of silicon photodiodes. This designallowed the cross-comparison of different images, allowing a picture of the spatial and temporal distribution of x-ray self-emission to be established. The designwas tested in a series of pulsed-power-driven magnetic-reconnection experiments.
Highlights
The x-ray emission from high energy density (HED) plasmas is typically both transient and exhibits significant spatial variation
Time-integrated detectors are compelling in the sense they are simple and inexpensive; they provide no information about the time interval in which x-ray emission occurs, and some dynamical aspects of experiments are obscured by motion blurring
We presented a design for a time-resolved x-ray imaging system to characterize x-ray self-emission in HED experiments
Summary
The x-ray emission from high energy density (HED) plasmas is typically both transient and exhibits significant spatial variation. The information gained from time-integrated x-ray detectors is often augmented with (time-resolved) detectors which convert x-ray flux into an electrical signal Examples of such detectors include photo-conducting diamonds (PCDs), vacuum x-ray diodes (XRDs), and silicon photodiodes. These are, typically fielded as spatially integrated diagnostics. We describe a diagnostic that bridges the gap between the time-integrated and time-resolved x-ray diagnostics discussed above This novel design made use of two separate x-ray imaging systems: a pinhole which imaged light onto the image plate (time-integrated) and a slit which imaged light onto both the image plate and a linear array of silicon diodes (time-resolved). The design we present was used to diagnose x-ray self-emission in reconnection experiments performed on the MAGPIE generator at the Imperial College. A diagnostic based on the design described here is being developed to diagnose plasma dynamics in magnetic reconnection experiments performed on the Z-Machine at Sandia National Laboratories.
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