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Autoresonant phase-space holes in plasmas
L Friedland1, P Khain, A G Shagalov
1Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Physical Review Letters
|June 29, 2006
Summary
Electron phase-space holes are created and managed in plasma using autoresonance with a chirped wave. This method, requiring a minimum driving amplitude, drags phase-space voids into the particle distribution through Cherenkov resonance.
Area of Science:
- Plasma Physics
- Nonlinear Dynamics
- Beam-Plasma Interactions
Background:
- Electron phase-space holes are non-linear structures that can trap plasma particles.
- Understanding their formation and control is crucial for applications like particle acceleration and plasma heating.
- Previous methods for controlling these structures were limited.
Purpose of the Study:
- To investigate a novel method for forming and controlling electron phase-space holes.
- To elucidate the underlying physical mechanism of autoresonance in this context.
- To determine the conditions necessary for efficient hole formation and manipulation.
Main Methods:
- Utilizing adiabatic nonlinear phase locking (autoresonance) with a chirped frequency driving wave.
- Analyzing the threshold behavior related to the driving wave's amplitude.
- Examining the role of persistent Cherenkov-type resonance in phase-space dynamics.
Main Results:
- Demonstrated the formation and control of electron phase-space holes via autoresonance.
- Identified a threshold amplitude for the driving wave necessary for this process.
- Showcased the dragging of a phase-space void into the bulk distribution through Cherenkov resonance.
Conclusions:
- Autoresonance provides an effective mechanism for controlling plasma structures like electron phase-space holes.
- The identified threshold and resonance mechanism offer new avenues for plasma manipulation.
- This controlled formation has implications for advanced plasma-based technologies.
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