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The potential of Dielectric Laser Accelerators [1] is currently limited due to the low bunch charges typically achieved. This is because the small lateral sizes of the accelerating structures pose strict requirements on the injection beam. A bunched low emittance beam is thus required for reasonable injection efficiency. We propose a compact low-energy design of an electron injector based on the Ultracold Electron Source [2, 3] and a novel permanent magnet lens designed through genetic optimization. Simulations indicate a beam waist in the order of 1 um and bunch length of 1ps at a bunch charge of 1 fC can be attained without a linac. This can potentially increase the bunch charge of Dielectric Laser Accelerators by several orders of magnitude.
- R. Joel England et al., Dielectric laser accelerators, Rev. Mod. Phys. 86, 1337
- J. G. H. Franssen et al., Compact ultracold electron source based on a grating magneto-optical trap, Phys. Rev. Accel. Beams 22, 023401
- T. C. H. de Raadt et al., Subpicosecond Ultracold Electron Source, Phys. Rev. Lett. 130, 205001
