JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Tobiyama, M. AU - Ikeda, H. AU - Mitsuka, G. ED - Schaa, Volker R.W. ED - Batten, Tonia ED - Bree, Michael ED - Petit-Jean-Genaz, Christine ED - Hunter, Darren TI - Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings J2 - Proc. of IBIC2023, Saskatoon, Canada, 10-14 September 2023 CY - Saskatoon, Canada T2 - International Beam Instrumentation Conference T3 - 12 LA - english AB - In the SuperKEKB rings, we have encountered extremely-fast beam losses occurring primarily within one to two turns in some parts of the bunch train. Such ¿sudden beam loss¿ induced severe failure in the vertical collimator heads, quenches on the superconducting final quadrupoles, and damage on the Belle II detector in some cases. Thus it is essential to investigate the cause and take countermeasures. This paper presents the phenomena clarified by the bunch current and position monitor of the bunch feedback system. The upgrade plan for the existing monitor, and recently developed simple monitors installed in the suspected area is also introduced. PB - JACoW Publishing CP - Geneva, Switzerland SP - 179 EP - 182 KW - luminosity KW - feedback KW - detector KW - operation KW - vacuum DA - 2023/12 PY - 2023 SN - 2673-5350 SN - 978-3-95450-236-3 DO - doi:10.18429/JACoW-IBIC2023-TUP002 UR - https://jacow.org/ibic2023/papers/tup002.pdf ER -