MARSF modeling of postdisruption runaway beam loss by magnetohydrodynamic instabilities in DIIID
Abstract
A drift orbit model for relativistic test electrons has been incorporated into the MARSF code, in order to study the runaway electron (RE) behavior in the presence of magnetohydrodynamic perturbations computed by MARSF. By implementing the model directly into the MARSF curvelinear magnetic coordinates, maximal accuracy in representing the full field perturbation is preserved. The updated code is utilized to study the high current RE beam loss in a postdisruption DIIID plasma, revealing that a fast growing, n = 1 (n is the toroidal mode number) resistive kink instability, at ~100 Gauss level, can induce significant fraction of RE loss, largely by perturbing drift orbits of REs. A 103 Gauss perturbation fully terminates the RE beam, as found in both experiment and modeling. The 3D field induced loss increases with the perturbation amplitude but decreases with the particle energy. The loss fraction is generally not sensitive to the initial particle pitch angle. The particle velocity change, due to electric field acceleration/deceleration, small pitch angle scattering, synchrotron radiation and Bremsstrahlung, further perturbs the RE trajectory but plays a minor role in prompt RE loss within microseconds time scale. Therefore, the dominant dependencies are simply the RE energy and instability strength. Formore »
 Authors:

 General Atomics, San Diego, CA (United States)
 SLS2 Consulting, San Diego, CA (United States)
 Publication Date:
 Research Org.:
 General Atomics, San Diego, CA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Fusion Energy Sciences (FES)
 OSTI Identifier:
 1568765
 Grant/Contract Number:
 FG0295ER54309
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Fusion
 Additional Journal Information:
 Journal Volume: 59; Journal Issue: 12; Journal ID: ISSN 00295515
 Publisher:
 IOP Science
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; runaway electrons; MHD instabilities; MHD; RE loss; disruption; orbit loss
Citation Formats
Liu, Y. Q., Parks, P. B., PazSoldan, C., Kim, C., and Lao, L. L. MARSF modeling of postdisruption runaway beam loss by magnetohydrodynamic instabilities in DIIID. United States: N. p., 2019.
Web. doi:10.1088/17414326/ab3f87.
Liu, Y. Q., Parks, P. B., PazSoldan, C., Kim, C., & Lao, L. L. MARSF modeling of postdisruption runaway beam loss by magnetohydrodynamic instabilities in DIIID. United States. https://doi.org/10.1088/17414326/ab3f87
Liu, Y. Q., Parks, P. B., PazSoldan, C., Kim, C., and Lao, L. L. Fri .
"MARSF modeling of postdisruption runaway beam loss by magnetohydrodynamic instabilities in DIIID". United States. https://doi.org/10.1088/17414326/ab3f87. https://www.osti.gov/servlets/purl/1568765.
@article{osti_1568765,
title = {MARSF modeling of postdisruption runaway beam loss by magnetohydrodynamic instabilities in DIIID},
author = {Liu, Y. Q. and Parks, P. B. and PazSoldan, C. and Kim, C. and Lao, L. L.},
abstractNote = {A drift orbit model for relativistic test electrons has been incorporated into the MARSF code, in order to study the runaway electron (RE) behavior in the presence of magnetohydrodynamic perturbations computed by MARSF. By implementing the model directly into the MARSF curvelinear magnetic coordinates, maximal accuracy in representing the full field perturbation is preserved. The updated code is utilized to study the high current RE beam loss in a postdisruption DIIID plasma, revealing that a fast growing, n = 1 (n is the toroidal mode number) resistive kink instability, at ~100 Gauss level, can induce significant fraction of RE loss, largely by perturbing drift orbits of REs. A 103 Gauss perturbation fully terminates the RE beam, as found in both experiment and modeling. The 3D field induced loss increases with the perturbation amplitude but decreases with the particle energy. The loss fraction is generally not sensitive to the initial particle pitch angle. The particle velocity change, due to electric field acceleration/deceleration, small pitch angle scattering, synchrotron radiation and Bremsstrahlung, further perturbs the RE trajectory but plays a minor role in prompt RE loss within microseconds time scale. Therefore, the dominant dependencies are simply the RE energy and instability strength. For comparison, a resonant magnetic perturbation field, generated by 4 kAt n = 3 even parity Icoil currents in DIIID and with the plasma response field included, is found to induce almost no loss for the same RE beam.},
doi = {10.1088/17414326/ab3f87},
journal = {Nuclear Fusion},
number = 12,
volume = 59,
place = {United States},
year = {2019},
month = {10}
}
Web of Science
Figures / Tables:
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