Electron Weibel instability induced magnetic fields in optical-field ionized plasmas

Abstract

Generation and amplification of magnetic fields in plasmas is a long-standing topic that is of great interest to both plasma and space physics. The electron Weibel instability is a well-known mechanism responsible for self-generating magnetic fields in plasmas with temperature anisotropy and has been extensively investigated in both theory and simulations, yet experimental verification of this instability has been challenging. Recently, we demonstrated a new experimental platform that enables the controlled initialization of highly nonthermal and/or anisotropic plasma electron velocity distributions via optical-field ionization. Using an external electron probe bunch from a linear accelerator, the onset, saturation and decay of the self-generated magnetic fields due to electron Weibel instability were measured for the first time to our knowledge. In this paper, we will first present experimental results on time-resolved measurements of the Weibel magnetic fields in non-relativistic plasmas produced by Ti:Sapphire laser pulses (0.8 $\mu m$) and then discuss the feasibility of extending the study to quasi-relativistic regime by using intense $\mathrm{C}{\mathrm{O}}_2$ (e.g., 9.2 $\mu m$) lasers to produce much hotter plasmas.

arXiv comment22 pages, 10 figures

References in corpus (15)

• Generation of Magnetic Fields in the Relativistic Shock of Gamma-Ray-Burst Sources
• Observation of magnetic field generation via the Weibel instability in interpenetrating plasma flows
• Apparent Thermalization due to Plasma Instabilities in Quark-Gluon Plasma
• Particle Acceleration in Relativistic Jets due to Weibel Instability
• Filamentation instability of counter-streaming laser-driven plasmas
• Are GRB shocks mediated by the Weibel instability?
• Cosmic-ray-induced filamentation instability in collisionless shocks
• Giant collimated gamma-ray flashes
• Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions
• Quantitative shadowgraphy and proton radiography for large intensity modulations
• Capturing relativistic wake eld structures in plasmas using ultrashort high-energy electrons as a probe
• Probing Ultrafast Magnetic-Field Generation by Current Filamentation Instability in Femtosecond Relativistic Laser-Matter Interactions
• Measurements of the growth and saturation of electron Weibel instability in optical-field ionized plasmas
• Generating ultra-dense pair beams using 400 GeV/c protons
• Initializing anisotropic and unstable electron velocity distributions needed for investigating plasma kinetic instabilities

Cited by in corpus (1)

• Electron Weibel instability and~quasi-magnetostatic structures in~an~expanding collisionless plasma