3D Theory of the Plasma Cascade Instability

TL;DR

This paper develops a comprehensive 3D theoretical framework for the plasma cascade instability, enabling analysis of wave propagation in any direction, which advances understanding of microbunching in electron beams.

Contribution

It introduces a new 3D theory of PCI that generalizes previous models limited to orthogonal wave propagation, broadening the scope of analysis.

Findings

Allows wave propagation in arbitrary directions

Extends the theoretical understanding of PCI

Facilitates better modeling of microbunching phenomena

Abstract

The plasma cascade instability (PCI) is a proposed mechanism for microbunching in electron beams without dipole magnets. Existing theory is limited to wave propagation that is orthogonal to the advective compression direction. This work provides a theory allowing for wave propagation in arbitrary directions.