Speaker
Description
The Linac Extension Area (LEA) at the Advanced Photon Source (APS) is a testbed, in the BeamNetUS network, capable of delivering high-brightness electron beams with sub-micrometer emittances and adjustable charge from 100 pC to 1.5 nC for advanced accelerator research and development. In this work, we present beam dynamics simulations and optimization of the photoinjected beam, including analysis of collective effects at the cathode and coherent synchrotron radiation (CSR) in the bunch compressor. Near the photocathode, 3D space-charge forces are modeled self-consistently alongside the photoemission process to capture emittance growth during the low-energy phase of acceleration. CSR-induced energy spread and emittance dilution in the bunch compressor are evaluated using a fully 3D self-consistent integrator that accounts for transverse effects. The initial laser profile shape is optimized to minimize energy spread and emittance at the injector exit, accounting for these collective phenomena.
We also report on experimental measurements of the photoinjected beam and compare them to the predictions obtained by the aforementioned simulations.
This work was supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-ACO2-O6CH11357.
| Working group | WG5 |
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