The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
| Title | Long-Term Stability of the Beam Position Monitors at SPring-8 | |||||
| Authors |
|
|||||
| Abstract | At the SPring-8 storage ring, the renewal of BPM electronics in 2006 has improved orbit feedback resolution *. However, a stability issue of the whole BPM system, including the buttons, the cables and the electronics, remains to be settled for long-term stability of the beam orbit. The BPM in the present SPring-8 has gain imbalances among 4 electrode channels, which result in large offsets (~1 mm). The imbalances are routinely corrected in accordance with a beam-based measurement **. But, the offset error increases close to 100 um during the operation, because of the imbalance fluctuations. Major origin of the imbalances is standing waves caused by reflections in BPM cables. As a countermeasure for the imbalance issue, isolators to mitigate the standing waves were equipped. They significantly reduced the imbalances, but not sufficient to completely suppress the imbalance fluctuations. The requirement of stability for the BPM system for the upgrade plan of SPring-8 is going to be more stringent. We started extensive survey to find the sources of fluctuations of the gain imbalances in order to achieve long-term stability of the BPM system applicable to the planned SPring-8 upgrade. | |||||
| Footnotes & References | * S. Sasaki, T. Fujita et al., Proc. of the DIAPC 2007, Venice, Italy, (2007) p. 114 ** M. Masaki et al., Proc. of the 11th Symp. on Accel. Sci. and Technol., (1997), p.83. |
|||||
| Paper | download TUPB020.PDF [1.879 MB / 5 pages] | |||||
| Conference | IBIC2015, Melbourne, Australia | |||||
| Series | International Beam Instrumentation Conference (4th) | |||||
| Proceedings | Link to full IBIC2015 Proccedings | |||||
| Session | Poster Session 2 | |||||
| Date | 15-Sep-15 16:00–18:00 | |||||
| Main Classification | BPMs and Beam Stability | |||||
| Keywords | radiation, photon, operation, synchrotron, storage-ring | |||||
| Publisher | JACoW, Geneva, Switzerland | |||||
| Editors | Mark Boland (SLSA, Clayton, Australia); David Button (ANSTO, Menai, Australia); Kathleen Riches (SLSA, Clayton, Australia); Volker RW Schaa (GSI, Darmstadt, Germany) | |||||
| ISBN | 978-3-95450-176-2 | |||||
| Published | January 2016 | |||||
| Copyright |
|
