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082 _ _ |a 530
100 1 _ |a Abdullaev, S. S.
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245 _ _ |a Mechanism of runaway electron beam formation during plasma disruptions in tokamaks
260 _ _ |a [S.l.]
|c 2015
|b American Institute of Physics
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520 _ _ |a A new physical mechanism of formation of runaway electron beams during plasma disruptions in tokamaks is proposed. The plasma disruption is caused by a strong stochastic magnetic field formed due to nonlinearly excited low-mode number magnetohydrodynamic (MHD) modes. It is conjectured that the runaway electron beam is formed in the central plasma region confined inside the intact magnetic surface located between q = 1 and the closest low–order rational magnetic surfaces [q = 5/4 or q = 4/3,…]. It results in that runaway electron beam current has a helical nature with a predominant m/n = 1/1 component. The thermal quench and current quench times are estimated using the collisional models for electron diffusion and ambipolar particle transport in a stochastic magnetic field, respectively. Possible mechanisms for the decay of the runaway electron current owing to an outward drift electron orbits and resonance interaction of high–energy electrons with the m/n = 1/1 MHD mode are discussed.
536 _ _ |a 172 - Tokamak Physics (POF3-172)
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700 1 _ |a Finken, K. H.
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700 1 _ |a Wongrach, K.
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700 1 _ |a Tokar, M.
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700 1 _ |a Koslowski, H. R.
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700 1 _ |a Willi, O.
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700 1 _ |a Zeng, L.
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773 _ _ |a 10.1063/1.4919253
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