Angol nyelvű Tudományos Szakcikk (Folyóiratcikk)

- SJR Scopus - Condensed Matter Physics: D1

Azonosítók

- MTMT: 31015514
- DOI: 10.1088/1741-4326/ab3f87
- WoS: 000494953500007

Szakterületek:

A drift orbit model for relativistic test electrons has been incorporated into the
MARS-F code (Liu et al 2000 Phys. Plasmas 7 3681), in order to study the runaway electron
(RE) behavior in the presence of magneto-hydrodynamic perturbations computed by MARS-F.
By implementing the model directly into the MARS-F curve-linear magnetic coordinates,
maximal accuracy in representing the full field perturbation is preserved. The updated
code is utilized to study the high current RE beam loss in a post-disruption DIII-D
plasma, revealing that a fast growing, n = 1 (n is the toroidal mode number) resistive
kink instability, at similar to 100 Gauss level, can induce significant fraction of
RE loss, largely by perturbing drift orbits of REs. A similar to 1000 Gauss perturbation
fully terminates the RE beam, as found in both experiment and modeling. The 3D field
induced loss increases with the perturbation amplitude but decreases with the particle
energy. The loss fraction is generally not sensitive to the initial particle pitch
angle. The particle velocity change, due to electric field acceleration/deceleration,
small pitch angle scattering, synchrotron radiation and Bremsstrahlung, further perturbs
the RE trajectory but plays a minor role in prompt RE loss within microseconds time
scale. Therefore, the dominant dependencies are simply the RE energy and instability
strength. For comparison, a resonant magnetic perturbation field, generated by 4 kAt
n = 3 even parity I-coil currents in DIII-D and with the plasma response field included,
is found to induce almost no loss for the same RE beam.

2020-08-10 21:42