Proton deflectometry with in situ x-ray reference for absolute measurement of electromagnetic fields in high-energy-density plasmas

We report a technique of proton deflectometry that uses a grid and an in situ reference x-ray grid image for precise measurements of magnetic fields in high-energy-density plasmas. A D3He fusion implosion provides a bright point source of both protons and x-rays, which is split into beamlets by a gr...

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Bibliographic Details
Published in:Review of scientific instruments 2022-02, Vol.93 (2), p.023502-023502
Main Authors: Johnson, C. L., Malko, S., Fox, W., Schaeffer, D. B., Fiksel, G., Adrian, P. J., Sutcliffe, G. D., Birkel, A.
Format: Article
Language:English
Subjects:
Algorithms
Deflection
Density
Electromagnetic fields
Expanding plasmas
Magnetic fields
Nonuniform magnetic fields
Plasmas (physics)
Point sources
Protons
Scientific apparatus & instruments
Straight lines
X-rays
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Summary:We report a technique of proton deflectometry that uses a grid and an in situ reference x-ray grid image for precise measurements of magnetic fields in high-energy-density plasmas. A D3He fusion implosion provides a bright point source of both protons and x-rays, which is split into beamlets by a grid. The protons undergo deflections as they propagate through the plasma region of interest, whereas the x-rays travel along straight lines. The x-ray image, therefore, provides a zero-deflection reference image. The line-integrated magnetic fields are inferred from the shifts of beamlets between the deflected (proton) and reference (x-ray) images. We developed a system for analysis of these data, including automatic algorithms to find beamlet locations and to calculate their deflections from the reference image. The technique is verified in an experiment performed at OMEGA to measure a nonuniform magnetic field in vacuum and then applied to observe the interaction of an expanding plasma plume with the magnetic field.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0064263