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Description
In a storage ring with an extremely small global phase slippage, the bunch length can vary significantly within one turn due to the local phase slippage and transverse-longitudinal coupling, which means the adiabatic approximation usually adopted for longitudinal dynamics breaks down. The impact of such a bunch length variation arising from the local phase slippage on the coherent synchrotron radiation (CSR) induced microwave instability (MWI) threshold has recently been theoretically investigated by us*. In this work, we have extended the study to consider the influence of transverse-longitudinal coupling and presented a general bursting threshold formula. We also report on experimental tests of the theoretical prediction performed at the Metrology Light Source.
Footnotes
- Bian, J. H., et al. "Threshold studies of coherent synchrotron radiation induced microwave instability beyond adiabatic approximation." Physical Review Accelerators and Beams 28.7 (2025): 074401.
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