Journal
NUCLEAR FUSION
Volume 61, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1741-4326/ac1e5e
Keywords
runaway electrons; tokamak disruptions; MHD instabilities
Categories
Funding
- US Department of Energy, Office of Science, Office of Fusion Energy Sciences [DE-AC05-00OR22725, DE-FC02-04ER54698, DE-AC02-09CH11466, DE-SC0015878]
Ask authors/readers for more resources
A novel detector using stacked BGO crystals has been developed for studying runaway electrons in the DIII-D tokamak, revealing oscillations in both the population and energy of the confined runaway electron tail during rapid growth.
A novel detector, using stacked BGO crystals, is developed for runaway electron (REs) studies in the DIII-D tokamak. It is able to resolve fast dynamics of high-energy tail formation of REs with an ultra-high time resolution of similar to 1 mu s. As a cost, the detector estimates the 'effective' energy of a given shape of gamma-ray spectra and sacrifices the energy resolution. In aid of the new measurement capability, a rapid, inhomogeneous growth of RE tail is observed in detail during a major disruption triggered by an argon pellet. It is found that both the population and energy of a well-confined RE tail significantly oscillate at the early period of the growth. The oscillation phase is locked to a slow rotating magnetohydrodynamic instability, which is briefly destabilized for only similar to 1 ms at the early period of the current quench. The oscillation ceases promptly, when the mode disappears. The data suggests that the high-energy RE tail is well-confined and accelerated via a localized helical structure in the plasma core.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available