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Persistent URL http://purl.org/net/epubs/work/50458997
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Record Id 50458997
Title Simulation of the Filling Pattern Dependent Regenerative Beam Breakup Instabilities in Energy Recovery Linacs
Abstract The interaction of a transversely displaced beam with the higher modes (HOM) of the accelerating cavities causes building up HOM voltages in the cavity, which in turn kicks the beam and increases the offset further. This is known as regenerative beam breakup (BBU) instability and it sets the beam threshold current for the stable beam operation. A study by Setiniyaz et al. [Setiniyaz2020] showed the filling pattern and recombination schemes of multi-turn energy recovery linacs (ERLs) can create many different beam loading transients, which can have a big impact on the cavity fundamental mode voltage and RF stabilizes. In this work, we extend the study of the filling pattern and recombination schemes to the BBU instabilities and threshold current. In the ERLs, the accelerated and decelerated bunches can be ordered differently while they pass through the cavity and form different filling patterns. Each pattern has a unique bunch energy sequence and bunch arrival times and hence interacts with cavity uniquely and thus drives BBU differently. In this paper, we introduce a simulation tool to investigate the filling pattern dependence of the ERL BBU instability.
Organisation ASTeC , ASTeC-AP , CI , STFC
Keywords linac , simulation , HOM , electron , cavity
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Language English (EN)
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Paper In Conference Proceedings In 12th International Particle Accelerator Conference (IPAC 2021), Campinas, Brazil, 24-28 May 2021, International Particle Accelerator Conference (2021): 1431-1434. doi:10.18429/JACoW-IPAC2021-TUPAB038 2021