AI Article Synopsis
- A study examined the improvement of single-stage laser wakefield acceleration (LWFA) using a gas mixture of 0.3% nitrogen and 99.7% helium.
- The interaction of high-intensity laser pulses with this gas mixture produced electron beams exceeding 300 MeV at specific plasma densities.
- The ionization injection from nitrogen led to more efficient electron generation, resulting in higher energy and charge, without issues like low-energy electrons or multiple beams, with potential for further optimization for advanced applications.
Article Abstract
We report on overall enhancement of a single-stage laser wakefield acceleration (LWFA) using the ionization injection in a mixture of 0.3% nitrogen gas in 99.7% helium gas. Upon the interaction of 30-TW, 30-fs laser pulses with a gas jet of the above gas mixture, >300 MeV electron beams were generated at a helium plasma densities of 3.3-8.5 × 10(18) cm(-3). Compared with the uncontrolled electron self-injection in pure helium gas jet, the ionization injection process due to the presence of ultra-low nitrogen concentrations appears to be self-controlled; it has led to the generation of electron beams with higher energies, higher charge, lower density threshold for trapping, and a narrower energy spread without dark current (low energy electrons) or multiple bunches. It is foreseen that further optimization of such a scheme is expected to bring the electron beam energy-spread down to 1%, making them suitable for driving ultra-compact free-electron lasers.
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| http://dx.doi.org/10.1364/OE.22.029578 | DOI Listing |
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