Spatiotemporal evolution of runaway electrons from synchrotron images in Alcator C-Mod
- 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.
- 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
Web of Science
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journal | July 2019 |
Physics of runaway electrons in tokamaks
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journal | June 2019 |
Experimental and synthetic measurements of polarized synchrotron emission from runaway electrons in Alcator C-Mod
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journal | July 2019 |
Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images
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journal | March 2021 |
Experimental and synthetic measurements of polarized synchrotron emission from runaway electrons in Alcator C-Mod | text | January 2019 |
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