Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity
| Autor: | Martin Dohlus, Thorsten Hellert, Winfried Decking |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
Nuclear and High Energy Physics beam dynamics Physics and Astronomy (miscellaneous) Computation DESY XFEL FOS: Physical sciences beam transport Tracking (particle physics) 01 natural sciences law.invention Flash (photography) Optics law 0103 physical sciences ddc:530 transfer matrix lcsh:Nuclear and particle physics. Atomic energy. Radioactivity numerical calculations 010306 general physics Physics Klystron 010308 nuclear & particles physics business.industry RF system alignment Surfaces and Interfaces Injector Transverse plane superconductivity [cavity] DESY FLASH stability [beam] Trajectory Physics::Accelerator Physics lcsh:QC770-798 Physics - Accelerator Physics business bunching performance Beam (structure) |
| Zdroj: | Physical Review Accelerators and Beams, Vol 20, Iss 10, p 100702 (2017) Physical review accelerators and beams 20(10), 100702 (2017). doi:10.1103/PhysRevAccelBeams.20.100702 |
| ISSN: | 2469-9888 |
| DOI: | 10.1103/PhysRevAccelBeams.20.100702 |
| Popis: | FLASH and the European XFEL are SASE-FEL user facilities, at which superconducting TESLA cavities are operated in a pulsed mode to accelerate long bunch-trains. Several cavities are powered by one klystron. While the low-level rf system is able to stabilize the vector sum of the accelerating gradient of one rf station sufficiently, the rf parameters of individual cavities vary within the bunch-train. In correlation with misalignments, intrabunch-train trajectory variations are induced. An efficient model is developed to describe the effect at low beam energy, using numerically adjusted transfer matrices and discrete coupler kick coefficients, respectively. Comparison with start-to-end tracking and dedicated experiments at the FLASH injector will be shown. The short computation time of the derived model allows for comprehensive numerical studies on the impact of misalignments and variable rf parameters on the transverse intra-bunch-train beam stability at the injector module. Results from both, statistical multibunch performance studies and the deduction of misalignments from multibunch experiments are presented. |
| Databáze: | OpenAIRE |
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