Diagnosing magnetic fields in cylindrical implosions with oblique proton radiography

Heuer, P. V.; Leal, L. S.; Davies, J. R.; Hansen, E. C.; Barnak, D. H.; Peebles, J. L.; García-Rubio, F.; Pollock, B.; Moody, J.; Birkel, A.; Seguin, F. H.

doi:10.1063/5.0092652

Title: Diagnosing magnetic fields in cylindrical implosions with oblique proton radiography

Journal Article · Mon Jul 18 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0092652· OSTI ID:1885760

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^[3]; Seguin, F. H. ^[3]

University of Rochester, NY (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Two experiments at the OMEGA Laser System used oblique proton radiography to measure magnetic fields in cylindrical implosions with and without an applied axial magnetic field. Although the goal of both experiments was to measure the magnitude of the compressed axial magnetic field in the core of the implosion, this field was obfuscated by two features in the coronal plasma produced by the compression beams: an azimuthal self-generated magnetic field and small length scale, high-amplitude structures attributed to collisionless effects. In order to understand these features, synthetic radiographs are generated using fields produced by 3D HYDRA simulations. These synthetic radiographs reproduce the features of the experimental radiographs with the exception of the small-scale structures. A direct inversion algorithm is successfully applied to a synthetic radiograph but is only partially able to invert the experimental radiographs in part because some protons are blocked by the field coils. The origins of the radiograph features and their dependence on various experimental parameters are explored. Furthermore, the results of this analysis should inform future measurements of compressed axial magnetic fields in cylindrical implosions.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: SC0020431; NA0003856; AR0000568; AC52-07NA27344

OSTI ID:: 1885760

Alternate ID(s):: OSTI ID: 1876467; OSTI ID: 1973192

Report Number(s):: LLNL-JRNL-846892; 2022-113; 1735; 2697; TRN: US2309648

Journal Information:: Physics of Plasmas, Vol. 29, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Diagnosing magnetic fields in cylindrical implosions with oblique proton radiography

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