anticipated muon rates
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Anticipated Muon RatesAnticipated Muon RatesRandom Information that might be Related Random Information that might be Related to the Anticipated Muon Ratesto the Anticipated Muon Rates
• Existing (ISIS-trip limited) measurements
• Comparison with new beamline
• Target test
• Conclusion
Existing MeasurementsExisting Measurements
Momentum Total rate/Hz
Fractions/%
p e
Rate Rate
130 8.2 0.0 25.5 67.7 6.8 2.1 5.6
160 11.3 0.0 61.7 28.9 9.4 7.0 3.3
175 17.3 0.0 77.5 16.6 5.9 13.4 2.9
200 25.4 0.0 75.0 18.7 6.3 19.1 4.7
230 12.4 0.0 81.7 13.3 4.9 10.1 1.6
265 19.0 0.0 87.6 5.1 7.3 16.6 1.0
280 355.9 0.0 100.0 355.9
300 2005.6 49.5 50.4 1010.8
350 2477.3 89.0 11.0 272.5
380 4083.3 95.7 4.3 175.6
400 5087.8 98.1 1.9 96.7
420 4047.4 98.6 1.4 56.7
450 99.5 0.5
500 4662.1 99.8 0.2 9.3
Existing MeasurementsExisting Measurements
ComparisonComparison
Q1 Horiz.
Q2 Vert.
ComparisonComparison
Q1 Horiz.
Q2 Vert.
Proton beamline, not muon
8” beampipe
Collection at 40o, not 25o
Production at 626MeV, not 800
50Hz………
TargetTarget
20.0
1.0
70.020.0
8.0
TargetTarget
2 ms
Target: 50 Hz + 150 Hz motion:
20 ms
Beam bump:
• ~1ms
• <650 MeV
Pion ProductionPion Production
626 MeV 800 MeV
LAHET LAHET (MCNP)(MCNP)
Factor ~30 increase at 430 MeV
~30k max. /s with old beamline in new position
Target TestTarget Test
• Presented previously
• Tough analysis
• Results not entirely obvious to interpret~2x109 protons
~1x1010 protons
~3x1011 protons
~7x1011 protons
Beamloss – c/o Dean AdamsBeamloss – 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
Integration periodTolerance in protons per pulse
Trapping 0-2.5 ms 4.9E12
Acceleration 2.5-9.5 ms 2.0E12
Extraction 9.5-10 ms 1.0E12
MICE can’t do this
Average Trip: 25 pulse rolling average
Integration periodTolerance in protons per pulse
Trapping 0-2.5 ms 4.5E12
Acceleration 2.5-9.5 ms 0.5E12
Extraction 9.5-10 ms 0.5E12
MICE can do this with
~1013 in a single pulse
Beamloss – c/o Dean AdamsBeamloss – 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.”
Target TestTarget Test
~2x109 protons
~1x1010 protons
~3x1011 protons
~7x1011 protons
0.2V ~1010 protons
BIM immediate trip
ConclusionConclusion
• 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.