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