Unidentified Falling Objects

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Unidentified Falling Objects (UFOs) are believed to be dust particles of size 1-100μm which fall into the path of the LHC beam, potentially causing beam losses. Beam loss monitors (BLMs) can trigger a beam dump upon detection of such losses to protect the magnets from quenches or damage from beam loss[1]


  1. Hempel, M., et al. "Bunch by bunch beam loss diagnostics with diamond detectors at the LHC." HB2012, Beijing, September (2012).), (Proceedings of HB2012)

See also