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@inproceedings{terui:ipac2021-wepab359,
author = {S. Terui and Y. Funakoshi and H. Hisamatsu and T. Ishibashi and K. Kanazawa and Y. Ohnishi and K. Shibata and M. Shirai and Y. Suetsugu and M. Tobiyama},
% author = {S. Terui and Y. Funakoshi and H. Hisamatsu and T. Ishibashi and K. Kanazawa and Y. Ohnishi and others},
% author = {S. Terui and others},
title = {{Report on Collimator Damaged Event in SuperKEKB}},
booktitle = {Proc. IPAC'21},
pages = {3541--3544},
eid = {WEPAB359},
language = {english},
keywords = {electron, detector, positron, MMI, operation},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-WEPAB359},
url = {https://jacow.org/ipac2021/papers/wepab359.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB359},
abstract = {{Collimator jaws for SuperKEKB main ring, which is an electron-positron collider, installed to suppress background noise in a particle detector complex named Belle II. In high current operations with 500 mA or more, jaws were occasionally damaged by hitting abnormal beams. This trouble is a low-frequency, which is once-a-commissioning period currently, but high-consequence one because we are not able to apply high voltage on detectors in Belle II by high backgrounds. At this moment this jaw damage event occurs, we observed pressure burst near the collimator with the beam abort, there was no sign of beam oscillation indicating instability, and the beam intensity suddenly decreased a few turns before the abort. I predict that the cause of this jaw damage was that a sudden change of the beam energy by the collision with dust. In this paper, the explanation of the observation result of this events and tracking simulation of beam colliding with dust are reported.}},
}