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- W190223506 abstract "In the Advanced Photon Source storage ring, a transverse single-bunch instability has long been observed that appears unique to this ring. Many of its features have been previously reported. New results have recently been obtained using beam centroid history measurements and analysis. These preliminary results provide more detailed information regarding the characteristics of this instability and could provide insight into the physics mechanism. A new transverse single-bunch instability has been observed for several years in the Advanced Photon Source storage ring. It exhibits two distinctive modes: steady-state, with stable centroid oscillations, and bursting, with periodic burst-like oscillations. At a certain threshold current, the beam starts a steady-state oscillation whose amplitude grows gradually with increasing current. When the current reaches a second threshold, the beam quickly transits into the bursting mode whose period and amplitude changes with increasing current. At even higher current, the beam can return to a steady-state oscillation. For a given machine condition, the entire sequence may not be observed before losing the beam. The physical mechanism of this instability is not clear yet. Many measurements have been taken to characterize this instability and the results were documented. Recently, more observations were made using Model-Independent Analysis of simultaneouslymore » recorded beam histories at hundreds of turn-by-turn beam position monitors (BPMs). Some of the findings are reported here. These results are far from systematic and complete, unfortunately, because of the difficulties in data acquisition and analysis caused by our faulty beam history system. Nonetheless, these new observations provide further information on the characteristics of this unsolved instability. Since it is unsolved, we will describe the phenomena only and keep speculation to a minimum.« less" @default.
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- W190223506 date "2004-01-01" @default.
- W190223506 modified "2023-10-17" @default.
- W190223506 title "New characteristics of a single-bunch instability in the APS storage ring" @default.
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