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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

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Shot-to-shot electron beam pointing instability in a nonlinear plasma bubble.

Bifeng Lei¹, Bin Liu², Mingyuan Shi^3,4

¹Center for Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Peking University, Beijing 100871, China.

Physical Review. E

|February 17, 2024

Summary

This summary is machine-generated.

Electron beam pointing jitter (EBJ) in laser wakefield accelerators (LWFA) is amplified by betatron oscillations within the plasma bubble. Understanding these resonant amplification processes is key to improving LWFA stability and applications.

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Area of Science:

Plasma Physics
Accelerator Physics
Quantum Electrodynamics

Background:

Electron beam pointing jitter (EBJ) is a significant challenge in laser wakefield acceleration (LWFA).
Variations in laser and plasma parameters cause EBJ, but the underlying physics of its growth within plasma waves is not fully understood.

Purpose of the Study:

To theoretically investigate the fundamental physics governing EBJ growth in LWFA plasma bubbles.
To identify and analyze the mechanisms responsible for amplifying EBJ.

Main Methods:

Developed analytical models for electron trajectory, pointing angle, and EBJ based on electron momentum equations.
Verified theoretical findings through numerical simulations.
Investigated the influence of radiation reaction on EBJ.

Main Results:

Identified intrinsic betatron oscillation as an amplifier for EBJ.
Discovered two key amplification processes: linear resonance in wobbling bubbles and parametric resonance in breathing bubbles.
Quantified the growth rates and resonance conditions for these processes.
Showed that fluctuations in laser (strength, focus, CEP) and plasma (density, profile) parameters initiate EBJ.

Conclusions:

The dynamics of the plasma bubble dictate EBJ evolution.
Understanding resonant amplification mechanisms is crucial for mitigating EBJ.
This research clarifies EBJ dynamics, paving the way for enhanced LWFA stability and broader applications.