A Kinetic Study of the Saturation of the Bell Instability

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/92210078166
ZOOM-Meeting ID: 92210078166
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/12-Galactic-Particle-Acceleration-including-PIC-CRI-CRD-MM/127
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-03/4

Abstract:
'The nonresonant streaming (Bell) instability plays a crucial role in the confinement and acceleration of cosmic rays (CRs), but the mechanism ultimately responsible for its saturation has never been determined from first principles. We present 1D, 2D, and 3D hybrid (kinetic ions and fluid electrons) plasma simulations in which the saturation of the Bell instability is studied as a function of the CR current. We derive a prescription for the value of the amplified magnetic field at saturation, also providing a theoretical explanation for it. These results provide the necessary tools to self-consistently incorporate CR-driven magnetic field amplification into fluid simulations and analytical calculations.'

Authors: Georgios Zacharegkas
Co-Authors: Damiano Caprioli | Colby Haggerty | Siddhartha Gupta
Indico-ID: 1356
Proceeding URL: https://pos.sissa.it/395/483