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| Title | Simulation Study of Normal-Conducting Double RF System for the 3-GeV KEK Light Source Project | |||||
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| Abstract | For the proposed 3-GeV KEK Light Source (KEK-LS) project*, a double RF system using 500-MHz accelerating and 1.5-GHz third-harmonic cavities is under consideration. To mitigate intrabeam scattering due to ultra-low emittance, the bunch length will be elongated using the harmonic cavities which is based on the TM020 resonant mode. An accelerating cavity based on this mode was first proposed by Ego et al.**, and we found it very suitable for the harmonic cavities due to the following reasons: 1) it has high unloaded-Q and high stored electromagnetic energy which result in the reduction of transient beam-loading effect due to bunch gaps, and 2) efficient damping of higher (or lower) order modes is possible. Our investigations based on numerical simulations predicted the bunch elongation by a factor of 3.1 when realistic bunch-gaps were assumed. To improve the bunch elongation further, we also proposed to compensate the transient beam loading with two realistic measures: 1) compensation of rf voltages due to feedforward technique, and 2) compensation using a separate rf cavity. We will present our study on the double rf system based on numerical simulations. | |||||
| Footnotes & References | * K. Harada et al., IPAC2016, THPMB012. ** H. Ego et al., Proceedings of the 11-th Annual Meeting of Particle Accelerator Society of Japan, Aug. 9-11, 2014, MOOL14 [in Japanese]. |
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| Paper | download THPIK037.PDF [0.180 MB / 4 pages] | |||||
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |||||
| Conference | IPAC2017, Copenhagen, Denmark | |||||
| Series | International Particle Accelerator Conference (8th) | |||||
| Proceedings | Link to full IPAC2017 Proccedings | |||||
| Session | Posters Thursday 2 | |||||
| Date | 18-May-17 16:00–18:00 | |||||
| Main Classification | 07 Accelerator Technology | |||||
| Sub Classification | T06 Room Temperature RF | |||||
| Keywords | cavity, beam-loading, storage-ring, emittance, simulation | |||||
| Publisher | JACoW, Geneva, Switzerland | |||||
| Editors | Volker RW Schaa (GSI, Darmstadt, Germany); Gianluigi Arduini (CERN, Geneva, Switzerland); Juliana Pranke (ESS, Lund, Sweden); Mike Seidel (PSI, Villigen, Switzerland); Mats Lindroos (ESS, Lund, Sweden) | |||||
| ISBN | 978-3-95450-182-3 | |||||
| Published | May 2017 | |||||
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