Investigation on Mysterious Long-Term Orbit Drift at NSLS-II

Hidaka, Yoshiteru; Cheng, Weixing; Doom, Lewis; Fliller, Raymond; Ganetis, George; Gosman, John; Hetzel, Charles; Hubbard, Rodger; Padrazo Jr, Danny; Podobedov, Boris; Rose, James; Shaftan, Timur; Sharma, Sushil; Smaluk, Victor; Tanabe, Toshiya; Tian, Yuke; Wang, Guimei; Yu, Chenghao

doi:10.18429/JACoW-IPAC2019-WEPGW102

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RIS citation export for WEPGW102: Investigation on Mysterious Long-Term Orbit Drift at NSLS-II

TY  - CONF
AU  - Hidaka, Y.
AU  - Cheng, W.X.
AU  - Doom, L.
AU  - Fliller, R.P.
AU  - Ganetis, G.
AU  - Gosman, J.
AU  - Hetzel, C.
AU  - Hubbard, R.A.
AU  - Padrazo Jr, D.
AU  - Podobedov, B.
AU  - Rose, J.
AU  - Shaftan, T.V.
AU  - Sharma, S.K.
AU  - Smaluk, V.V.
AU  - Tanabe, T.
AU  - Tian, Y.
AU  - Wang, G.M.
AU  - Yu, C.H.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Investigation on Mysterious Long-Term Orbit Drift at NSLS-II
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Over a few months in 2018, we observed occasional episodes of relatively quick accumulation of correction strengths for the fast correctors (used by the fast orbit feedback) near Cell 4 (C04) region at NSLS-II Storage Ring. We immediately started investigating the problem, but the cause remained unclear. However, after coming back from the Fall shutdown, we experienced even faster drifts, at a rate of as much as 10 urad per day in terms of orbit kick angle accumulation. The risk of damage on the ring vacuum chambers by the continuing orbit drift without explanation eventually forced us to take emergency study shifts and temporarily lock out the C04 IVU beamline. After extensive investigation by many subsystem experts in Accelerator Division, ruling out many suspicious sources one by one, we were finally able to conclude the cause to be the localized ground motion induced by large temperature jumps of the utility tunnel right underneath the C04 straight section. We report the details of this incident.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2728
EP  - 2731
KW  - accumulation
KW  - storage-ring
KW  - operation
KW  - power-supply
KW  - quadrupole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW102
UR  - http://jacow.org/ipac2019/papers/wepgw102.pdf
ER  -