| Title |
Study to Mitigate Electron Cloud Effect in SuperKEKB |
| Authors |
- Y. Suetsugu, H. Fukuma, K. Ohmi, K. Shibata, M. Tobiyama
KEK, Ibaraki, Japan
|
| Abstract |
During Phase-1 commissioning of the SuperKEKB from February to June 2016, electron cloud effects (ECE) were observed in the positron ring. The electron clouds were considered to exist in the beam pipes in the drift spaces of the ring, where the beam pipes have antechambers and titanium nitride (TiN) coating as countermeasures against ECE. Following this, permanent magnets and solenoids were attached to the beam pipes as additional countermeasures. Consequently, during Phase-2 commissioning from March to July 2018, experiments showed that the threshold beam current for exciting ECE increased by a factor of at least two relative to that during Phase-1 commissioning. While the countermeasures were strengthened, the effectiveness of the antechambers and TiN film coating was re-evaluated. From various simulations and experiments during Phase-2 commissioning, the antechamber was found to be less effective than expected with regard to reducing the number of photoelectrons in the beam channel. The TiN film coating, on the other hand, was considered to have a low secondary electron yield as expected.
|
| Paper |
download TUYAA04.PDF [1.584 MB / 8 pages] |
| Export |
download ※ BibTeX
※ LaTeX
※ Text/Word
※ RIS
※ EndNote |
| Conference |
eeFACT2018 |
| Series |
ICFA ABDW on High Luminosity Circular e$^+$e$^-$ Colliders (62nd) |
| Location |
Hong Kong, China |
| Date |
24-27 September 2018 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Ying-ying Li (HKUST, Hong Kong, China); Lu Li (IMP/CAS, Lanzhou, China); Volker RW Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-216-5 |
| Received |
27 September 2018 |
| Accepted |
19 February 2019 |
| Issue Date |
21 April 2019 |
| DOI |
doi:10.18429/JACoW-eeFACT2018-TUYAA04 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
|
