Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 7: Electron Accelerators
AKBP 7.8: Vortrag
Mittwoch, 17. März 2021, 15:45–16:00, AKBPb
Influence of collective effects on electron bunching — •Dmitrii Samoilenko1,2, Lucas Schaper2, Sven Ackermann2, Wolfgang Hillert1,2, and Enrico Allaria2 — 1University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany — 2DESY, Hamburg, Germany
FLASH is a free electron laser with high repetition rate in XUV and soft X-ray regime. Currently an upgrade for this facility is under development and it includes enabling an elaborated external seeding scheme: echo-enabled harmonic generation (EEHG). This scheme provides efficient electron bunching at high harmonics of the seeding laser, which will allow generation of seeded FEL radiation at wavelengths down to 4.16nm. To a considerable part the design implies sizable use of numerical simulations that predict performance of the future machine. Since these simulations are usually quite time- and resource-consuming, extensive parameter scans are expensive. The number of core-hours spent on the simulations can be reduced by educated guess for initial parameters. Here, an analytical study providing such a guess is performed on influence of collective effects on electron bunching for EEHG seeding scheme at FLASH. First, the study focuses on how different effects depend on beamline parameters separately to gain a clearer insight on each effect as compared to simulations. Then, combined contributions of the effects are considered together in order to determine an initial working point with promising performance.