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Title: $Efficiency considerations for high-energy physics applications of laser-plasma accelerators
Abstract: The efficiency of laser-plasma accelerators for high-energy physics applications is discussed. The laser and beam-driven wakefields in plasma channels are presented. Plasma channels enable independent control of accelerating and focusing forces, allowing both electron and positron acceleration, as well as mitigation of beam scattering with background ions. Shaped bunches may be used to achieve high efficiency without induced energy spread. High efficiency may be achieved for ultra-short bunches using a multi-bunch train format, without induced energy spread. A method for laser energy recovery is proposed, and a general expression for the driver-to-beam efficiency of a laser-plasma accelerator stage is derived. With the use of laser energy recovery, high efficiencies may be achieved for modest drive laser depletion.