Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D
A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated s...
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| Veröffentlicht in: | Physics of plasmas 2021-08, Vol.28 (8) |
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| creator | Popović, Ž. Hollmann, E. M. del-Castillo-Negrete, D. Bykov, I. Moyer, R. A. Herfindal, J. L. Shiraki, D. Eidietis, N. W. Paz-Soldan, C. Lvovskiy, A. |
| description | A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated shots as well as the polarization in a single discharge. Numerical studies with guiding center and full orbit simulations performed with the SOFT and KORC codes are given and compared to the experiment. The pitch angle evolution analyzed using a 1D impurity diffusion model in combination with kinetic simulations is also presented. These studies find agreement in the magnitude of the pitch angle, but not in the temporal rate of change of pitch angle. The measured pitch angle evolution timescale of order 50 ms falls between a modeled timescale of 20 ms in an equilibrium model and ≫100 ms in a nonequilibrium model. |
| doi_str_mv | 10.1063/5.0058927 |
| format | Article |
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M. ; del-Castillo-Negrete, D. ; Bykov, I. ; Moyer, R. A. ; Herfindal, J. L. ; Shiraki, D. ; Eidietis, N. W. ; Paz-Soldan, C. ; Lvovskiy, A.</creator><creatorcontrib>Popović, Ž. ; Hollmann, E. M. ; del-Castillo-Negrete, D. ; Bykov, I. ; Moyer, R. A. ; Herfindal, J. L. ; Shiraki, D. ; Eidietis, N. W. ; Paz-Soldan, C. ; Lvovskiy, A. ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States) ; General Atomics, San Diego, CA (United States)</creatorcontrib><description>A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated shots as well as the polarization in a single discharge. Numerical studies with guiding center and full orbit simulations performed with the SOFT and KORC codes are given and compared to the experiment. The pitch angle evolution analyzed using a 1D impurity diffusion model in combination with kinetic simulations is also presented. These studies find agreement in the magnitude of the pitch angle, but not in the temporal rate of change of pitch angle. The measured pitch angle evolution timescale of order 50 ms falls between a modeled timescale of 20 ms in an equilibrium model and ≫100 ms in a nonequilibrium model.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/5.0058927</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; Emission ; Evolution ; Hard X-rays ; Horizontal polarization ; Impurity diffusion ; Pitch (inclination) ; Plasma confinement ; Plasma dynamics ; Plasma physics ; Polarization ; Runaway electrons ; Synchrotron radiation ; Synchrotrons ; Time ; Tokamaks ; Vertical polarization</subject><ispartof>Physics of plasmas, 2021-08, Vol.28 (8)</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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M. ; del-Castillo-Negrete, D. ; Bykov, I. ; Moyer, R. A. ; Herfindal, J. L. ; Shiraki, D. ; Eidietis, N. 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(ORNL), Oak Ridge, TN (United States)</aucorp><aucorp>General Atomics, San Diego, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D</atitle><jtitle>Physics of plasmas</jtitle><date>2021-08-01</date><risdate>2021</risdate><volume>28</volume><issue>8</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated shots as well as the polarization in a single discharge. Numerical studies with guiding center and full orbit simulations performed with the SOFT and KORC codes are given and compared to the experiment. The pitch angle evolution analyzed using a 1D impurity diffusion model in combination with kinetic simulations is also presented. These studies find agreement in the magnitude of the pitch angle, but not in the temporal rate of change of pitch angle. 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| ispartof | Physics of plasmas, 2021-08, Vol.28 (8) |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY Emission Evolution Hard X-rays Horizontal polarization Impurity diffusion Pitch (inclination) Plasma confinement Plasma dynamics Plasma physics Polarization Runaway electrons Synchrotron radiation Synchrotrons Time Tokamaks Vertical polarization |
| title | Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D |
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