Recent experimental electron acceleration results from the 300 TW Gemini laser are presented. Employing an extended focussing geometry increased single stage energy gains beyond 2 GeV. High laser to electron beam conversion efficiencies are implied from charge measurements. The use of an adaptive length gas cell allowed peak acceleration gradients in excess of 350 GV/m to be measured, yielding multi-GeV electron beams in 1 cm long plasma targets.
Results from recent experiments performed at the 300 TW Gemini laser at Rutherford Appleton Laboratory are reported. The use of a longer focal length main focussing optic with a gas cell allowed single stage electron energy gains from to be extended beyond 2 GeV. High bunch charges of order of hundreds of pC were measured. These self injected, high energy and high charge electron beams also constitute high laser to beam energy conversion efficiencies. Employing a variable length gas cell allowed detailed measurements of electron beam energy evolution dynamics. Peak accelerating gradients in excess of 350 GeV/m were inferred from gas cell length scans.
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