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WE2A03 |
High-Field Short-Period Microwave Undulators |
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- J. Neilson
SLAC, Menlo Park, California, USA
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Inspired by recent developments in low-loss overmoded components and systems for ultra-high power RF systems, we explored several overmoded waveguide systems that could function as RF undulators. One promising structure is a corrugated waveguide system operating using the balanced hybrid HE11 mode. Initial calculations indicate that such a system can be operated at relatively low power levels while obtaining large values for the undulator parameters K~1. RF surface fields are typically low enough to permit superconducting operation. This technology can realize an undulator with short wavelengths and gives dynamic control of the undulator parameters including polarization. The scaling laws are verified through simulations and experimental data. The single electron dynamics, for both linearly polarized and circularly polarized (CP) standing wave undulator synthesized from this corrugated waveguide, will be presented. We will present our optimization strategy for such a geometry which not only need to taper the field profile but also have to maintain low losses and low surface fields.
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Slides WE2A03 [5.749 MB]
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| THPB089 |
Magnetic Characterization of the Phase Shifter Prototypes Built by CIEMAT for E-XFEL |
1029 |
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- I. Moya, J. Calero, J.M. Cela-Ruiz, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, L.M. Martinez, T. Martínez de Alvaro, E. Molina Marinas, L. Sanchez, S. Sanz, F. Toral, C. Vázquez, J.G.S. de la Gama
CIEMAT, Madrid, Spain
- J. Campmany, J. Marcos, V. Massana
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
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Funding: Work partially supported by Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009 and project ref. AIC-2010-A-000524
The European X-ray Free Electron Laser (E-XFEL) will be based on a 10 to 17.5 GeV electron linac that will be used in the undulator system to obtain ultra-brilliant X-ray flashes from 0.1 to 6 nanometres for experimentation. The undulator system is formed by undulators and intersections between them, where a quadrupole on top of a precision mover, a beam position monitor, two air coils and a phase shifter are allocated. The function of the phase shifter is to adjust the phase of the electron beam and the radiation when they enter in an undulator according to the different beam energies and wavelengths. CIEMAT is working on the development of the phase shifters, as part of the Spanish in-kind contribution to the E-XFEL project. Several problems reported elsewhere were detected in the first prototype, which did not fulfil the first field integral specification. This paper describes the magnetic measurements realized on the second and third prototypes in the test bench at CELLS, together with the tuning process to decrease the field integral dependence with gap.
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