Journal
PHYSICS OF PLASMAS
Volume 24, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4993206
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Funding
- EU [289191]
- STFC Cockcroft Institute core Grant [ST/G008248/1]
- Science and Technology Facilities Council [ST/P002056/1] Funding Source: researchfish
- STFC [ST/P002056/1] Funding Source: UKRI
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The acceleration of a beam of electrons has been observed in a dielectric laser-driven accelerator with a gradient of 300 MV/m. It opens the way to building a particle accelerator on a chip much more cheaply than a conventional one. This paper investigates numerically an efficient dielectric laser-driven accelerating structure, based on dual-gratings with a Bragg reflector. The design of the structure boosts the accelerating field in the channel, thereby increasing the accelerating gradient by more than 70% compared to bare dual-gratings, from analytical calculations. This is supported by two-dimensional (2D) particle-in-cell simulations, where a 50MeV electron bunch is loaded into an optimized 100-period structure to interact with a 100 fs pulsed laser having a peak field of 2 GV/m. It demonstrates a loaded accelerating gradient of 1.48 +/- 0.10 GV/m, which is (85 +/- 26)% higher than that of bare dual-gratings. In addition, studies of the diffraction effect show that the optimized structure should be fabricated with a vertical size of J/w(x) >= 0.20 in order to generate an acceptable accelerating performance. Published by AIP Publishing.
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