Resolving runaway electron distributions in space, time, and energy

Paz-Soldan, Carlos; Cooper, C. M.; Aleynikov, P.; Eidietis, Nicholas W.; Lvovskiy, A.; Pace, David C.; Brennan, D. P.; Hollmann, E. M.; Liu, C.; Moyer, R. A.; Shiraki, Daisuke

doi:10.1063/1.5024223

Title: Resolving runaway electron distributions in space, time, and energy

Journal Article · Tue May 01 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5024223· OSTI ID:1435648

^[1]; Cooper, C. M. ^[2]; Aleynikov, P. ^[3]; Eidietis, Nicholas W. ^[1];

^[2];

^[1]; Brennan, D. P. ^[4]; Hollmann, E. M. ^[5];

^[4];

^[5]; Shiraki, Daisuke ^[6]

General Atomics, San Diego, CA (United States)
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Max-Planck Institute for Plasma Physics, Greifswald (Germany)
Princeton Univ., Princeton, NJ (United States)
Univ. of California San Diego, La Jolla, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Areas of agreement and disagreement with present-day models of RE evolution are revealed by measuring MeV-level bremsstrahlung radiation from runaway electrons (REs) with a pinhole camera. Spatially-resolved measurements localize the RE beam, reveal energy-dependent RE transport, and can be used to perform full two-dimensional (energy and pitch-angle) inversions of the RE phase space distribution. Energy-resolved measurements find qualitative agreement with modeling on the role of collisional and synchrotron damping in modifying the RE distribution shape. Measurements are consistent with predictions of phase-space attractors that accumulate REs, with non-monotonic features observed in the distribution. Temporally-resolved measurements find qualitative agreement with modeling on the impact of collisional and synchrotron damping in varying the RE growth and decay rate. Anomalous RE loss is observed and found to be largest at low energy. As a result, possible roles for kinetic instability or spatial transport to resolve these anomalies are discussed.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698; AC05-00OR22725; FC02-99ER54512; FG02-07ER54917; SC0016268

OSTI ID:: 1435648

Alternate ID(s):: OSTI ID: 1427889

Journal Information:: Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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