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Experimental Runaway Electron Current Estimation in COMPASS Tokamak

Institute of Physics, University of Belgrade, Pregrevica 118, P.O. Box 68, 11080 Belgrade, Serbia
Institute of Plasma Physics, Czech Academy of Sciences—Institute of Plasma Physics, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
Author to whom correspondence should be addressed.
Atoms 2019, 7(1), 12;
Received: 30 November 2018 / Revised: 5 January 2019 / Accepted: 13 January 2019 / Published: 16 January 2019
(This article belongs to the Special Issue SPIG2018)
PDF [2520 KB, uploaded 26 January 2019]


Runaway electrons present a potential threat to the safe operation of future nuclear fusion large facilities based on the tokamak principle (e.g., ITER). The article presents an implementation of runaway electron current estimations at COMPASS tokamak. The method uses a theoretical method developed by Fujita et al., with the difference in using experimental measurements from EFIT and Thomson scattering. The procedure was explained on the COMPASS discharge number 7298, which has a significant runaway electron population. Here, it was found that at least 4 kA of the plasma current is driven by the runaway electrons. Next, the method aws used on the set of plasma discharges with the variable electron plasma density. The difference in the plasma current was explained by runaway electrons, and their current was estimated using the aforementioned method. The experimental results are compared with the theory and simulation. The comparison presented some disagreements, showing the possible direction for the code development. Additional application on runaway electron energy limit is also addressed. View Full-Text
Keywords: runway electron; plasma current; fusion plasma; tokamak runway electron; plasma current; fusion plasma; tokamak

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Vlainic, M.; Ficker, O.; Mlynar, J.; Macusova, E.; the COMPASS Tokamak Team. Experimental Runaway Electron Current Estimation in COMPASS Tokamak. Atoms 2019, 7, 12.

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