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We present an experimental demonstration of the efficient acceleration ofelectrons beyond 60 MeV using micro-channel plasma targets. We employed ahigh-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 \mu m innerdiameter, 300 \mu m long micro-channel plasma target. The micro-channel wasaligned to be collinear with the incident laser pulse, confining the majorityof the laser energy within the channel. The measured electron spectrum showed alarge increase of the cut-off energy and slope temperature when compared tothat from a 2 \mu m flat Copper target, with the cutoff energy enhanced by over2.6 times and the total energy in electrons >5 MeV enhanced by over 10 times.Three-dimensional particle-in-cell simulations confirm efficient direct laseracceleration enabled by the novel structure as the dominant accelerationmechanism for the high energy electrons. The simulations further reveal theguiding effect of the channel that successfully explains preferentialacceleration on the laser/channel axis observed in experiments. Finally,systematic simulations provide scalings for the energy and charge of theelectron pulses. Our results show that the micro-channel plasma target is apromising electron source for applications such as ion acceleration,Bremsstrahlung X-ray radiation, and THZ generation.

Relativistic laser driven electron accelerator using micro-channel plasma targets