Speaker
Description
Interactions of dust grains with the particle beams can degrade the performance of modern high-intensity accelerators. Existing models developed for the LHC assume grains smaller than the beam size and therefore a spatially uniform primary-particle flux through the grain. This approximation breaks down in flat lepton beams, where the vertical beam size can be smaller than the dust grain.
To describe this regime, a model is introduced for the ionisation and dynamics of dust grains interacting with electron, positron, and proton beams. The grain is discretised into slices, allowing position-dependent ionisation to be treated spatially. The equation of motion is solved with a time-dependent charge using an ionisation model adapted to flat-beam geometries. Application to representative FCC-ee and SuperKEKB parameters provides first quantitative estimates of the penetration depth of charged dust grains.
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