Speaker
Description
In past collider operations, interactions between dust grains and particle beams have had significant detrimental effects on performance. Earlier studies of dust–beam interactions with proton beams at the LHC typically assumed dust grains smaller than the beam itself. Understanding the dynamics of dust grains exposed to beams much smaller than the grain is crucial for assessing dust-induced limitations in facilities such as SuperKEKB and the Future Circular Collider (FCC-ee). To address this, a model is introduced to describe the stepwise ionisation of dust grains interacting with electron or positron beams, along with the resulting dynamics and thermal evolution. The grain is discretised into slices that progressively move through the beam. Each slice is independently subjected to ionisation and energy deposition, enabling a spatially resolved description of the charging process. The equation of motion with time-dependent charge is solved using an ionisation model specifically adapted to flat-beam geometries. The model is then applied to representative FCC-ee parameters, providing the first quantitative estimates of dust charging, acceleration, and possible beam deflection induced by a charged dust grain.
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