Speaker
Description
We present a simulation study of a nanostructured plasmonic copper photocathode for use in the new photoinjector that is presently being developed for the high-duty-cycle operation upgrade of the European XFEL. The simulations are based on a spatially resolved photoemission model using the Fowler-DuBridge formalism and including the Schottky effect induced by the accelerating field on the cathode surface. Particle-in-cell simulations are performed to evaluate the phase-space of the beam in the near-cathode region. It is shown that while quantum efficiency is improved, photoemission from the plasmonic cathode leads to a substantially increased transverse emittance and higher energy spread of the beam compared to the case of a flat copper surface. Space-charge effects remain moderate for the operating bunch charge considered in the study.
Funding Agency
Work is funded by the German Ministry of Research (BMBF) under
contract 005K2022
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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