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Anticipated Muon Rates. Random Information that might be Related to the Anticipated Muon Rates. Existing (ISIS-trip limited) measurements Comparison with new beamline Target test Conclusion. Existing Measurements. Existing Measurements. Comparison. Comparison. Proton beamline, not muon
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Anticipated Muon Rates Random Information that might be Related to the Anticipated Muon Rates Existing (ISIS-trip limited) measurements Comparison with new beamline Target test Conclusion
Comparison Proton beamline, not muon 8” beampipe Collection at 40o, not 25o Production at 626MeV, not 800 50Hz………
Target Target: 50 Hz + 150 Hz motion: 2 ms 20 ms Beam bump: ~1ms <650 MeV
Pion Production LAHET (MCNP) 626 MeV 800 MeV • Factor ~30 increase at 430 MeV • ~30k max. /s with old beamline in new position
~3x1011 protons ~7x1011 protons ~2x109 protons ~1x1010 protons Target Test Presented previously Tough analysis Results not entirely obvious to interpret
Beamloss – c/o Dean Adams Beamloss: protection & diagnosis Currently from BLMs: Inhibit: 20 pulses > V in 10min - beam off for 1.5s Trip: another inhibit within 10s – upset operators! MICE can inhibit, but can’t trip! “ “ BIMs: Immediate trip : 3 consecutive pulses exceed tolerance MICE can’t do this Average Trip: 25 pulse rolling average MICE can do this with ~1013 in a single pulse
Beamloss – c/o Dean Adams From Christmas 07 from BLMs: Trip: 20 consecutive pulses > V MICE can’t trip! “The potential ability to take 1e13 proton without tripping is worrying. We may have to produce some trip derived on a single integrated blm measurement running on the MICE pulse. Changing the pulse counts to 1 would also be a solution but its effect on ISIS operation would require investigation.”
0.2V ~1010 protons ~3x1011 protons ~7x1011 protons ~2x109 protons ~1x1010 protons Target Test BIM immediate trip
Conclusion To know real pion/muon rate: need another test The BLM’s surrounding the MICE target in super period 7 have a tolerance level of 0.05 Vs under normal operation. The old HEP target , (50Hz operation) , tolerance levels were set to 0.2Vs. It is conceivable that > 0.2 Vs is satisfactory for MICE operation since the target operates at only 1 Hz. Suitable machine activation measurements should be performed to find an acceptable level.