Volume 113, Number 3, February 2016
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||24 February 2016|
Effect of halo on the stability of electron bunches in laser wakefield acceleration
1 Photon Pioneers Center, Osaka University - 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
2 CREST, Japan Science and Technology Agency - 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
3 Graduate School of Engineering, Osaka University - 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
4 Institute of Laser Engineering, Osaka University - 2-8 Yamada-oka, Suita, Osaka 565-0871, Japan
Received: 22 October 2015
Accepted: 5 February 2016
The stability of short electron bunches formed and accelerated by laser wakefield in gas jets strongly depends on parameters of pre-plasma due to poor pulse focus-ability. Instabilities provoked by light energy remained out of focus spots (halo), usually 30–50%, are shown to result in broad and spotted transverse distributions of electrons in uniform gas jets radiated by high-contrast laser pulses. Shaped pre-plasma may drastically improve pulse focus-ability with stable, well-pointed, and well-collimated electron bunches.
PACS: 41.75.Jv – Laser-driven acceleration / 52.38.Kd – Laser-plasma acceleration of electrons and ions
© EPLA, 2016
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