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RIS citation export for THPV028: Analysis of AC Line Fluctuation for Timing System at KEK

AU  - Wang, D.
AU  - Enomoto, Y.
AU  - Furukawa, K.
AU  - Kaji, H.
AU  - Miyahara, F.
AU  - Sato, M.
AU  - Sugimura, H.
ED  - Furukawa, Kazuro
ED  - Yan, Yingbing
ED  - Leng, Yongbin
ED  - Chen, Zhichu
ED  - Schaa, Volker R.W.
TI  - Analysis of AC Line Fluctuation for Timing System at KEK
J2  - Proc. of ICALEPCS2021, Shanghai, China, 14-22 October 2021
CY  - Shanghai, China
T2  - International Conference on Accelerator and Large Experimental Physics Control Systems
T3  - 18
LA  - english
AB  - The timing system controls the injection procedure of the accelerator by performing signal synchronization and trigger delivery to the devices all over the installations at KEK. The trigger signals is usually generated at the same phase of an AC power line to reduce the unwanted variation of the beam quality. This requirement originates from the power supply systems. However, the AC line synchronization conflicts with the bucket selection process of SuperKEKB low energy ring (LER) which stores the positron beam. The positron beam is firstly injected into a damping ring (DR) to lower the emittance before entering desired RF bucket in LER. A long bucket selection cycle for DR and LER makes it difficult to coincide with AC line every injection pulse. This trouble is solved by grouping several injection pulses into various of injection sequences and manipulating the length of sequences to adjust the AC line arrival timing. Therefore, the timing system is sensitive to drastically AC line fluctuation. The failure of timing system caused by strong AC line fluctuation and solutions are introduced in this work.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 923
EP  - 926
KW  - timing
KW  - injection
KW  - linac
KW  - operation
KW  - positron
DA  - 2022/03
PY  - 2022
SN  - 2226-0358
SN  - 978-3-95450-221-9
DO  - doi:10.18429/JACoW-ICALEPCS2021-THPV028
UR  - https://jacow.org/icalepcs2021/papers/thpv028.pdf
ER  -