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| Title | Investigation of Longitudinal Beam Dynamics With Harmonic Cavities by Using the Code Mbtrack | |
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| Abstract | In diffraction-limited light sources, the study of collective effects is essential. With harmonic cavities (HCs), the ’flat potential condition’ can be achieved, lengthening the bunch by a factor of ~5. However, the effective rf voltage seen by the beam becomes sensitive to both positions and distributions of all bunches, as the beam-induced voltage of both HCs and fundamental cavities (FCs) contribute. In addition, when there are empty buckets, the transient beam loading induces considerable variations of the rf voltage impacting the beam performance*. Here the use of analytical approaches is difficult. Then we introduced the new functions to treat the high-Q resonators driven by either or both of the beams and external generators to the code mbtrack**. Using these features, various operating conditions with arbitrary fill patterns can be studied; coupled bunch instability induced by HOMs of the cavity, Robinson instabilities and general beam dynamics with HCs. The growth rates of the instabilities described above are compared with analytical results. The ring performance with HCs in several fill patterns shall be also reported. | |
| Footnotes & References | * N.Yamamoto, et al., PRAB, 21, 012001 (2018). **G. Skripka, et al., NIM A806, 221 (2016). |
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| Paper | download MOPGW039.PDF [0.317 MB / 3 pages] | |
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |
| Conference | IPAC2019 | |
| Series | International Particle Accelerator Conference (10th) | |
| Location | Melbourne, Australia | |
| Date | 19-24 May 2019 | |
| Publisher | JACoW Publishing, Geneva, Switzerland | |
| Editorial Board | Mark Boland (UoM, Saskatoon, SK, Canada); Hitoshi Tanaka (KEK, Tsukuba, Japan); David Button (ANSTO, Kirrawee, NSW, Australia); Rohan Dowd (ANSTO, Kirrawee, NSW, Australia); Volker RW Schaa (GSI, Darmstadt, Germany); Eugene Tan (ANSTO, Kirrawee, NSW, Australia) | |
| Online ISBN | 978-3-95450-208-0 | |
| Received | 15 May 2019 | |
| Accepted | 22 May 2019 | |
| Issue Date | 21 June 2019 | |
| DOI | doi:10.18429/JACoW-IPAC2019-MOPGW039 | |
| Pages | 178-180 | |
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