Resolving runaway electron distributions in space, time, and energy
Abstract
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.
- Authors:
-
[1];
[2];
[1];
[4];
[5];
- 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)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1435648
- Alternate Identifier(s):
- OSTI ID: 1427889
- Grant/Contract Number:
- FC02-04ER54698; AC05-00OR22725; FC02-99ER54512; FG02-07ER54917; SC0016268
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
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., and Shiraki, Daisuke. Resolving runaway electron distributions in space, time, and energy. United States: N. p., 2018.
Web. doi:10.1063/1.5024223.
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. Resolving runaway electron distributions in space, time, and energy. United States. https://doi.org/10.1063/1.5024223
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., and Shiraki, Daisuke. Tue .
"Resolving runaway electron distributions in space, time, and energy". United States. https://doi.org/10.1063/1.5024223. https://www.osti.gov/servlets/purl/1435648.
@article{osti_1435648,
title = {Resolving runaway electron distributions in space, time, and energy},
author = {Paz-Soldan, Carlos and Cooper, C. M. and Aleynikov, P. and Eidietis, Nicholas W. and Lvovskiy, A. and Pace, David C. and Brennan, D. P. and Hollmann, E. M. and Liu, C. and Moyer, R. A. and Shiraki, Daisuke},
abstractNote = {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.},
doi = {10.1063/1.5024223},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2018},
month = {Tue May 01 00:00:00 EDT 2018}
}
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