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RIS citation export for TUPOA71: Beam Stability During Top Off Operation at NSLS-II Storage Ring

AU - Cheng, W.X.
AU - Bacha, B.
AU - Li, Y.
AU - Singh, O.
AU - Tian, Y.
ED - Schaa, Volker RW
ED - Power, Maria
ED - Shiltsev, Vladimir
ED - White, Marion
TI - Beam Stability During Top Off Operation at NSLS-II Storage Ring
J2 - Proc. of NAPAC2016, Chicago, IL, USA, October 9-14, 2016
C1 - Chicago, IL, USA
T2 - North American Particle Accelerator Conference
T3 - 3
LA - english
AB - NSLS-II storage ring started top off operation since Oct 2015. User operation current has been gradually increased to 250mA. Observations of beam stabilities during top-off operations will be presented. Total beam current was typically maintained within ±0.5% and bunch to bunch current variation was less than 20%. Injection transition during top-off was measured bunch by bunch digitizer, and BPM to analyze the orbit motion at various bandwidths (turn by turn, 10kHz and 10Hz rate). Coupled bunch unstable motions were monitored. As the vacuum pressure improves, fast-ion instability is not as severe compared to early stage of commissioning/operation, but still observed as the dominant instability. Resistive wall instability is noticed as more in-vacuum-undulator (IVU) gaps closed. xBPM measured photon stability and electron beam stability at top off injection have been evaluated. Short term and long term orbit stabilities will be reported.
CP - Geneva, Switzerland
SP - 425
EP - 427
KW - ion
KW - feedback
KW - injection
KW - operation
KW - storage-ring
DA - 2017/01
PY - 2017
SN - 978-3-95450-180-9
DO - 10.18429/JACoW-NAPAC2016-TUPOA71
UR - https://jacow.org/napac2016/papers/tupoa71.pdf
ER -