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Related Experiment Video

Updated: May 16, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

Experimental study of current filamentation instability.

B Allen¹, V Yakimenko, M Babzien

¹University of Southern California, Los Angeles, California 90089, USA. brianall@usc.edu

Physical Review Letters

|December 11, 2012

Summary

This summary is machine-generated.

Researchers observed current filamentation instability in a laboratory setting using a 60 MeV electron beam and plasma capillary discharge. They found that reducing electron bunch charge suppresses this instability.

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Area of Science:

Plasma physics
Beam-plasma interactions
High-energy physics

Background:

Current filamentation instability is a critical phenomenon in beam-plasma systems.
Understanding its behavior is essential for applications involving high-energy particle beams propagating through plasmas.
Previous studies have explored this instability, but detailed laboratory observations under specific conditions are valuable.

Purpose of the Study:

To experimentally observe and characterize current filamentation instability.
To investigate the transition between single and multiple filament formation.
To study the scaling of filament size and the effect of beam parameters on instability suppression.

Main Methods:

Utilizing a 60 MeV electron beam.
Employing a plasma capillary discharge to create the plasma environment.
Imaging multiple filaments transversely at the plasma exit using optical transition radiation.
Varying plasma density and electron bunch charge to study instability dynamics.

Main Results:

Observed current filamentation instability in the laboratory setup.
Identified multiple filaments and imaged them using optical transition radiation.
Determined the transition criterion for single to multiple filaments as k(p)σ(r)~2.2 by varying plasma density.
Confirmed theoretical predictions of transverse filament size scaling with plasma skin depth across various plasma densities.
Demonstrated that lowering the electron bunch charge suppresses the instability.

Conclusions:

Current filamentation instability can be reliably studied in controlled laboratory experiments.
The transition to multiple filamentation is quantitatively linked to plasma parameters.
Filament size exhibits predictable scaling with plasma properties.
Electron bunch density is a key factor in controlling the onset and strength of filamentation instability.