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| Title | Design Study of Damped Accelerating Cavity Based on the TM020-Mode and HOM Couplers for the KEK Light Source Project | |||||
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| Abstract | A novel damped-cavity scheme was recently proposed by Ego et al.*. In this design, TM020 resonant mode is used for beam acceleration. Power of higher-order (or lower-order) modes are extracted through cylindrical slots which are placed at the position where the magnetic fields of HOMs are strong while that of TM020 mode is zero. Extracted powers are absorbed by lossy ferrites. In this scheme, excellent HOM damping is possible while occupying less space of the straight section in storage rings. We propose in this paper an alternative design which is based on the same TM020 mode but with rod-type HOM couplers. The rod-type HOM couplers are placed where the electric fields of HOMs are strong while that of TM020 mode is zero. In this scheme, openings needed for HOM extraction can be made smaller, which is desirable for stiffening the mechanical structure of the cavity. Potential use of lossy dielectric materials is another merit. We present external Q-values of HOMs that can be achieved in this scheme, as well as an effect of HOM couplers on the TM020 mode. Our current study is directed to a 1.5 GHz higher-harmonic cavity for the proposed KEK Light Source project**. | |||||
| Footnotes & References | * H. Ego et al., in Proceedings of the 11-th Annual Meeting of Particle Accelerator Society of Japan, Aug. 9-11, 2014, MOOL14 [in Japanese]. ** K. Harada et al., IPAC2016, THPMB012. |
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| Paper | download THPIK036.PDF [0.469 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, HOM, damping, target, 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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