A Kinetic Study of the Saturation of the Bell Instability

Georgios Zacharegkas; Damiano Caprioli; Colby Haggerty; Siddhartha Gupta

doi:10.22323/1.395.0483

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A Kinetic Study of the Saturation of the Bell Instability

Conference proceeding

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A Kinetic Study of the Saturation of the Bell Instability

Georgios Zacharegkas, Damiano Caprioli, Colby Haggerty and Siddhartha Gupta

Pos : proceedings of science, Vol.395, 483

03/18/2022

DOI: 10.22323/1.395.0483

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Abstract

The nonresonant cosmic ray instability, predicted by Bell (2004), is thought to play an important role in the acceleration and confinement of cosmic rays (CR) close to supernova remnants. Despite its importance, the exact mechanism responsible for the saturation of the instability has not been determined, and there is no first-principle prediction for the amplitude of the saturated magnetic field. Using a survey of self-consistent hybrid simulations (with kinetic ions and fluid electrons), we study the non-linear evolution of the Bell instability as a function of the parameters of the CR population. We find that saturation is achieved when the magnetic pressure in the amplified field is comparable to the initial CR momentum flux.

Details

Title: Subtitle: A Kinetic Study of the Saturation of the Bell Instability
Creators: Georgios Zacharegkas - University of Chicago
Damiano Caprioli - University of Chicago
Colby Haggerty - University of Hawaii System
Siddhartha Gupta - University of Chicago
Resource Type: Conference proceeding
Publication Details: Pos : proceedings of science, Vol.395, 483
DOI: 10.22323/1.395.0483
ISSN: 1824-8039
eISSN: 1824-8039
Language: English
Date published: 03/18/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9985224319102771

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