Speaker
Description
Beam losses caused by interactions between the circulating beam and dust grains have been observed at many particle accelerators, leading to premature beam dumps, quenches of superconducting magnets, and vacuum pressure bursts. At some facilities, these events have a significant impact on the overall accelerator performance.
The mechanisms by which dust grains detach from vacuum-chamber surfaces and enter the beam are not yet fully understood; one possible process is charge build-up on the grain followed by lofting due to the beam potential.
We present an experimental study of the charging and mobilisation of silica dust on accelerator-relevant surfaces: Cu, co-laminated Cu, laser-treated Cu, NEG-coated substrates and samples treated with VacSeal, a silicone-based resin widely used to seal vacuum leaks.
The observations provide input for dust-dynamics simulations and studies of beam losses.
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