Abstract
The emission of a short high charged electron bunch in a radiofrequency gun was simulated. The numerical model is supplemented by a positive charge arising and dynamically changing during emission in the cathode region The numerical results are compared with experimental data.
Highlights
High brightness electron sources are key components necessary for the successful operation of modern free electron lasers, new sources of synchrotron radiation and lepton colliders
The developed model is based on 2.5 dimensional finite difference-time domain (FDTD) particle-in-cell (PIC) code SUMA [Rashchikov, 1990]
Part of the code SUMA, responsible for photoemission, was modified in a way to simulate the appearance of the positive charges in the cathode region and there further dynamics
Summary
High brightness electron sources are key components necessary for the successful operation of modern free electron lasers, new sources of synchrotron radiation and lepton colliders. For a European X-ray Free Electron Laser (European XFEL) photo gun, electron bunches with a charge of 1 nC / bunch and a normalized transverse emittance < 0.9 mm mrad should be generated by an RF gun operating on a Cs2Te photocathode with a high electric field on the cathode surface (∼ 60 MV/m) and repetition rate up to 27,000 pulses per second.
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