Measurements of the Growth and Saturation of Electron Weibel Instability in Optical-Field Ionized Plasmas
Chaojie Zhang1, Jianfei Hua2, Yipeng Wu1
1Department of Electrical Engineering, University of California Los Angeles, Los Angeles, California 90095, USA.
Abstract:
The temporal evolution of the magnetic field associated with electron thermal Weibel instability in optical-field ionized plasmas is measured using ultrashort (1.8 ps), relativistic (45 MeV) electron bunches from a linear accelerator. The self-generated magnetic fields are found to self-organize into a quasistatic structure consistent with a helicoid topology within a few picoseconds and such a structure lasts for tens of picoseconds in underdense plasmas. The measured growth rate agrees well with that predicted by the kinetic theory of plasmas taking into account collisions. Magnetic trapping is identified as the dominant saturation mechanism.
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