On the synchrotron emission in kinetic simulations of runaway electrons in magnetic confinement fusion plasmas

Carbajal, L.; del-Castillo-Negrete, D.

doi:10.1088/1361-6587/aa883e

Title: On the synchrotron emission in kinetic simulations of runaway electrons in magnetic confinement fusion plasmas

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aa883e· OSTI ID:1526627

^[1]; del-Castillo-Negrete, D. ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Developing avoidance or mitigation strategies of runaway electrons (REs) in magnetic confinement fusion (MCF) plasmas is of crucial importance for the safe operation of ITER. In order to develop these strategies, an accurate diagnostic capability that allows good estimates of the RE distribution function in these plasmas is needed. Synchrotron radiation (SR) of RE in MCF, besides of being one of the main damping mechanisms for RE in the high energy relativistic regime, is routinely used in current MCF experiments to infer the parameters of RE energy and pitch angle distribution functions. In the present paper we address the long standing question about what are the relationships between different REs distribution functions and their corresponding synchrotron emission simultaneously including: full-orbit effects, information of the spectral and angular distribution of SR of each electron, and basic geometric optics of a camera. We study the spatial distribution of the SR on the poloidal plane, and the statistical properties of the expected value of the synchrotron spectra of REs. Here we observe a strong dependence of the synchrotron emission measured by the camera on the pitch angle distribution of runaways, namely we find that crescent shapes of the spatial distribution of the SR as measured by the camera relate to RE distributions with small pitch angles, while ellipse shapes relate to distributions of runaways with larger the pitch angles. A weak dependence of the synchrotron emission measured by the camera with the RE energy, value of the q-profile at the edge, and the chosen range of wavelengths is observed. Furthermore, we find that oversimplifying the angular dependence of the SR changes the shape of the synchrotron spectra, and overestimates its amplitude by approximately 20 times for avalanching runaways and by approximately 60 times for mono-energetic distributions of runaways.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1526627

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 59, Issue 12; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Spatiotemporal analysis of the runaway distribution function from synchrotron images in an ASDEX Upgrade disruption Hoppe, M.; Hesslow, L.; Embreus, O. Journal of Plasma Physics, Vol. 87, Issue 1 https://doi.org/10.1017/s002237782000152x	journal	January 2021

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