Spatiotemporal evolution of runaway electrons from synchrotron images in Alcator C-Mod

Tinguely, R. A.; Granetz, R. S.; Hoppe, M.; Embréus, O.

doi:10.1088/1361-6587/aae6ba

Title: Spatiotemporal evolution of runaway electrons from synchrotron images in Alcator C-Mod

Journal Article · Thu Oct 25 00:00:00 EDT 2018 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aae6ba· OSTI ID:1609301

^[1]; Granetz, R. S. ^[1];

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Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Chalmers University of Technology, Gothenburg (Sweden)

We report in the Alcator C-Mod tokamak, relativistic runaway electron (RE) generation can occur during the flattop current phase of low density, diverted plasma discharges. Due to the high toroidal magnetic field (B₀ = 5.4 T), RE synchrotron radiation is measured by a wide-view camera in the visible wavelength range (λ ≈ 400–900 nm). In this paper, a statistical analysis of over one thousand camera images is performed to investigate the plasma conditions under which synchrotron emission is observed in C-Mod. In addition, the spatiotemporal evolution of REs during one particular discharge is explored in detail via a thorough analysis of the distortion-corrected synchrotron images. To accurately predict RE energies, the kinetic solver CODE is used to evolve the electron momentum-space distribution at six locations throughout the plasma: the magnetic axis and flux surfaces q = 1, 4/3, 3/2, 2, and 3. These results, along with the experimentally-measured magnetic topology and camera geometry, are input into the synthetic diagnostic SOFT to simulate synchrotron emission and detection. Interesting spatial structure near the surface q = 2 is found to coincide with the onset of a locked mode and increased MHD activity. Furthermore, the RE density profile evolution is fit by comparing experimental to synthetic images, providing important insight into RE spatiotemporal dynamics.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Research Council (ERC)

Grant/Contract Number:: FC02-99ER54512; 647121

OSTI ID:: 1609301

Report Number(s):: PPCF-102117

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 60, Issue 12; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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