A. Bross MUTAC Meeting BNL April 2007 1 MuCool Overview Muon Cooling R&D Alan Bross.
Muon piquet report April 3-10, 2012
13
Muon piquet report April 3-10, 2012 Rolf Oldeman Muon operations meeting Aprl 10, 2012
description
Muon piquet report April 3-10, 2012. Rolf Oldeman Muon operations meeting Aprl 10, 2012. Last week’s fills with stable beam. Th 5/424693x31h30RICH timing scan. VELO out 247048x484h00VELO/ST timing scan 247148x482h20 OTscan - PowerPoint PPT Presentation
Transcript of Muon piquet report April 3-10, 2012
Muon piquet report April 3-10, 2012
Rolf OldemanMuon operations meeting Aprl 10,
2012
Last week’s fills with stable beamTh 5/4 2469 3x3 1h30 RICH timing scan. VELO out 2470 48x48 4h00 VELO/ST timing scan 2471 48x48 2h20 OTscan
2472 84x84 4h20 VELO CCscan & 10M TAE for MUONFr 6/4 2479 264x264 3h00 Bfield OFF. 45M minbiasSa 7/4 2482 264x264 3h30 HLT trouble
2486 84x84 1h30 LHC orbit studiesSu 8/4 2488 264x264 4h20 power glitches no ECAL
2489 264x264 4h15 some TELL1’s missing2490 264x264 1h15 HLT trouble2491 624x624 10h15 OK with mu=0.8 bare-bone TCK
Mo 9/4 2493 624x624 6h20 OK with mu=1.6 bare-bone TCKTu 10/4 2497 624x624 2:40 OK with mu=1.6 bare-bone TCK
HV raised for some chambers
PAD MAPS
Looks pretty good!
Timing
M1R1 (GEM) seems early by ~1 bin(1.6ns) wrt reference. Not understood.
Otherwise pretty goodtiming, based on 2011calibration
Some timing systematics though:
TELL1 firmware
• Xavier Gremaud optimized TELL1 firmware for speed to readout M1 @ 1MHz
• Also fixed ‘last missing MEP’ bug• But many errors in MUON/L0MU comparison
– Julien Cogan’s Tool to debug L0 actually used to debug MUON!
• Received v5.0.13 on Tu 3/4: no more errors– In time before stable beams!
• Thanks Xavier, Julien
HV tripsNew Twiki by Oleg:
Hotspot in M3R2
Present for a few fills. Then disappeared spontaneously
Dataquality feedback
Offline efficiency calculations indicate low efficiency in M4/M5
First thought to be related to outdated HLT DB with outdated muon positions
But hasn’t changed sincethe HLT DB tag was updated
Extensive set of expert histosput on DQ logbook https://lblogbook.cern.ch/Data+Quality/6144
Extra shielding behind M5• Effectiveness of to be studied in mode detail
April 5, long TAE run 11128550ns bunch trains
March 30, short TAE run 1102703x3 bunches (holes from TELL1bug)
~5xmore afterpulsethan real hits?
~same afterpulseas real hits?
DM: what’s that hole in M5?
thanks to extra shieldingor shorter pulse length?
Does the Alu ‘wall’ help shielding?
M5C, column A, row 32-27 currents Sept 8, 2011row pos gapA gapB gapC gapD 32 front 2.4 2.4 2.4 2.4 31 back 3.8 3.8 2.4 3.0 30 front 2.7 2.5 2.3 2.3 29 back 3.4 3.6 3.2 3.4 28 front 3.0 2.8 2.6 3.0 27 back 3.8 3.4 3.0 3.4
No significant gap-gap difference,But chambers behind wall draw ~30% less current
In TAE run, chambers behind wall have ~30% fewer hits than those in front
Install a small thin shielding in behind one or two chambers?
Two hints:
