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Piquet Report. Alessandro Cardini 21-29 May 2012. Monday 21 st. GEM current problem present: starting analysis Occasional M1 timing alarms in presenter Hole in M1A-18A1 FEBs 16, 17, 18 Strange histograms from THR scan Oleg manually set THR to 80: initially all ok, now situation is bad - PowerPoint PPT Presentation
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Piquet Report
Alessandro Cardini
21-29 May 2012
Monday 21st • GEM current problem present: starting analysis
Occasional M1 timing alarms in presenter
• Hole in M1A-18A1 FEBs 16, 17, 18– Strange histograms from THR scan– Oleg manually set THR to 80: initially all ok, now situation
is bad– Very few in-time hits, but all counts is only half the “good”
FEBs…
• One gap in M5A27_gapC (ABCD) almost in short
• 7 gaps tripped – excluded
• Fill 2649 (7h17’): integrated luminosity ~ 9.6 pb-1
A. Cardini / INFN Cagliari 3
Tuesday 22nd
• Configuration problem of some boards on C side – restart required at beginning of fill #2651
• Performing some 1% GEM gas variations to measure current sensitivity to gas mixture composition (nominal is Ar/Co2/CF4 45/15/40):– nominal 45/16/39 46/15/39 nominal
• Preparing
• 8 gaps tripped – excluded
• Fill 2651 (19h35’): integrated luminosity ~ 24.77 pb-1 (finished 23rd early morning)
18 maggio 2012
A. Cardini / INFN Cagliari 4
Wednesday 23rd
• Oleg performed a small time correction on a few channels (https://lblogbook.cern.ch/MUON/3404)
• 4 gaps tripped – excluded
• Fill 2653 (0h36’): integrated luminosity ~ 0.61 pb-1
• Fill 2657 (5h58’): integrated luminosity ~ 8.02 pb-1
18 maggio 2012
A. Cardini / INFN Cagliari 5
Thursday 24th
• GEM gas sampling pipes in UXA-A3 and –A1 connected
• Starting gas chromatography
• No tripped gaps
• Fill 2658 (1h21’): integrated luminosity ~ 1.70 pb-1
• Fill 2660 (1h12’): integrated luminosity ~ 1.30 pb-1
18 maggio 2012
A. Cardini / INFN Cagliari 618 maggio 2012
A. Cardini / INFN Cagliari 7
Friday 25th • @15:00: access
(https://lblogbook.cern.ch/MUON/3416):– M5A_27A_gapC disconnected– GEM LV problems on M1A18A1 FEBs 16, 17,18: checked
LV cables on M1A-18A1 regulators: found two power cable ~disconnected
• 3 gaps tripped – excluded
• Fill 2663 (11h20’): integrated luminosity ~ 15.45 pb-1
18 maggio 2012
A. Cardini / INFN Cagliari 8
Saturday 26th • Optimizing GEM working point: new settings is 3x415V
(+5V increase) https://lblogbook.cern.ch/MUON/3419
• 2 gaps tripped – excluded
• Fill 2669 (8h12’): integrated luminosity ~ 8.34 pb-1
18 maggio 2012
A. Cardini / INFN Cagliari 9
Sunday 27th • No beam due to cryo failure
• GC measurements on GEM gas continue in UXA-A1 (but will have to wait for Roberto for the analysis):– Fresh gas coming from SG building– Return mix from A and C side, with and without beam
18 maggio 2012
A. Cardini / INFN Cagliari 10
Monday 28th • Cryo recovered (Sunday ~23:00)
• New timing recipes for M1R1 loaded by Sandro: -1.5 ns global shift as suggested by Giacomo. Available from fill 2672
• Some more GEM HV tuning: increase transfer fields from 3.0 to 3.5 kV/cm (to be performed)
• 3 gaps tripped – excluded
• Fill 2670 (1h14’): integrated luminosity ~ 1.54 pb-1 • Fill 2671 (7h13’): integrated luminosity ~ 9.65 pb-1 • Fill 2673 (2h46’): integrated luminosity ~ 3.22 pb-1
18 maggio 2012
A. Cardini / INFN Cagliari 11
Tripped Gaps
18 maggio 2012