Betatron resonance electron acceleration and generation of quasi-monoenergetic electron beams using 200fs Ti:Sapphire laser pulses
arXiv:1706.07955 · doi:10.1088/1361-6587/aac97c
Abstract
Generation of collimated, quasi-monoenergetic electron beams (peak energy ~17-22MeV, divergence ~10mrad, energy spread ~20%) by interaction of Ti:sapphire laser pulse of 200fs duration, focussed to an intensity of ~ 2.1x10^18 W/cm^2,with an under-dense (density~3.6x10^19 to ~1.1x10^20 cm-3) He gas-jet plasma was observed. Two stages of self-focusing of the laser pulse in the plasma were observed. Two groups of accelerated electrons were also observed associated with these stages of the channeling and is attributed to the betatron resonance acceleration mechanism. This is supported by 2D PIC simulations performed using code EPOCH and a detailed theoretical analysis which shows that present experimental conditions are more favorable for betatron resonance acceleration and generation of collimated, quasi-thermal/quasi-monoenergetic electron beams.
arXiv comment20pages, 4 figures
References in corpus (7)
- Generating multi-GeV electron bunches using single stage laser wakefield acceleration in a 3D nonlinear regime
- Femtosecond x rays from laser-plasma accelerators
- Enhancement of electron energy to multi-GeV regime by a dual-stage laser-wakefield accelerator pumped by petawatt laser pulses
- Synergistic Laser Wakefield/Direct Laser Acceleration in the Plasma Bubble Regime
- Self-modulated laser wakefield accelerators as x-ray sources
- Transverse Dynamics and Energy Tuning of Fast Electrons Generated in Sub-Relativistic Intensity Laser Pulse Interaction with Plasmas
- Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas