Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity
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 gradien...
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American Physical Society
2017-10-01
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Series: | Physical Review Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.20.100702 |
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doaj-23631874787a42cfaffa0b2fc50a7de02020-11-24T23:28:54ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882017-10-01201010070210.1103/PhysRevAccelBeams.20.100702Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavityThorsten HellertMartin DohlusWinfried DeckingFLASH 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.http://doi.org/10.1103/PhysRevAccelBeams.20.100702 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Thorsten Hellert Martin Dohlus Winfried Decking |
spellingShingle |
Thorsten Hellert Martin Dohlus Winfried Decking Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity Physical Review Accelerators and Beams |
author_facet |
Thorsten Hellert Martin Dohlus Winfried Decking |
author_sort |
Thorsten Hellert |
title |
Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity |
title_short |
Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity |
title_full |
Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity |
title_fullStr |
Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity |
title_full_unstemmed |
Efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 GHz cavity |
title_sort |
efficient model for low-energy transverse beam dynamics in a nine-cell 1.3 ghz cavity |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2017-10-01 |
description |
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. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.20.100702 |
work_keys_str_mv |
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