Beam losses in the CLIC drive beam: specification of acceptable level and how to handle them. ACE 2010 02 04 Michael Jonker. Beam loss detection and Radiation issues. (in the main tunnel). BLM system primary purpose: detection of onset of slow losses.
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ACE 2010 02 04Michael Jonker
BLM system primary purpose: detection of onset of slow losses.
Operational beam loss background levels:
Loss levels limits
Hence, these limits will define the required vacuum performance
Dangerous level of beam loss when 10-2 of DB or 10-4 of MB is lost on an single aperture restriction. (Rough estimate needs further detailed simulations)
Extended range for catastrophic (fast) losses: diagnostics only. (i.e. to better understand what happened, if ever something should happen)
Material C Al Cu W
CLIC Drive Train (2.4 GeV, 24545 nC)
Energy Density @ shower core [J g-1] 1.34 3.08 40 187
2.4 GeV Lost before QP
1.5 TeV Lost in QP
Based on radiation limits of magnets during 10 years x 6 monthoperation.Regularmagnet design (no rad hard)
Next pulse permit and safe by design(2 ms)
Protection by fixed masks (Impedance?)