Speaker
Takuya Ishibashi
(High Energy Accelerator Research Organization)
Description
A nonlinear collimation system (NLC) was introduced into the SuperKEKB low energy ring (LER), a 4 GeV positron ring, during the first long shutdown (LS1) to reduce the impedance in the vertical direction. We built the impedance model of the LER after LS1 and simulated the tune shift as a function of the bunch current and the single-bunch collective instability for this model using PyHEADTAIL. We report the impedance budget and the results of the simulations with comparison to the tune shift measurements.
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Author
Takuya Ishibashi
(High Energy Accelerator Research Organization)
