Journal
PHYSICS OF PLASMAS
Volume 25, Issue 4, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5008561
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Funding
- Natural Science Foundation of China NSFC [11675107]
- center for high performance computing at Shanghai Jiao Tong University
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By using 25-45 TW ultra-short (30 fs) laser pulses, we report on the effect of the injection gas concentration on the quality of electron beams generated by a laser-driven plasma wakefield acceleration employing the ionization-injection. For a plasma formed from helium-nitrogen gas mixture and depending on the concentration of the nitrogen gas, we could distinguish a clear trend for the quality of the generated electron beams in terms of their peak energy, energy-spread, divergence angle, and beam charge. The results clearly showed that the lower the nitrogen concentration, the better the quality (higher peak energy, smaller energy spread, and smaller emittance) of the generated electron beams. The results are in reasonable agreement with two-dimensional particle-in-cell simulations. Published by AIP Publishing.
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