Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BP11: Poster Session I: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: Analytical,computational; Energetic Particles; Disruptions; Power Handling
ICF: Z-Pinch; MagnetoInertial Fusion; Hydrodynamics; Indirect drive
9:30 AM - 12:30 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: BP11.00055 : Marginal stability constraint on runaway electron distribution*
Presenter:
Dmitrii I Kiramov
(University of Texas at Austin)
Authors:
Dmitrii I Kiramov
(University of Texas at Austin)
Boris Breizman
(University of Texas at Austin)
Collaboration:
In a steady state, collisional damping balances the kinetic drive of the unstable waves, keeping the RE distribution function at marginal stability. The marginal stability constraint limits the achievable RE densities and the shape of the RE distribution function.
In this study, we consider whistler waves as the primary source of enhanced elastic scuttering of the runaways. By balancing the anomalous Doppler resonance drive with the collisional wave damping, we find the RE distribution function in the ultra-relativistic range of the phase space. We also derive an expression for the spectral energy density of the waves. We show that the power needed to compensate for the wave dissipation is negligible compared to the work of the electric field. The latter is in balance with the synchrotron losses of the runaway electrons.
*This work was supported by the U.S. Department of EnergyContract Nos. DEFG02–04ER54742 and DESC0016283.
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