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Performances of the tracking Chambers of the ALICE muon Spectrometer

Performances of the tracking Chambers of the ALICE muon Spectrometer. ALICE muon Spectrometer. Physics Goals  : Studying heavy quark production via their muonic and semi- muonic decay in Forward rapidity (-4 < y < -2.5 ) Large quarkonia acceptance down to p T  0

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Performances of the tracking Chambers of the ALICE muon Spectrometer

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  1. Performances of the tracking Chambers of the ALICE muon Spectrometer Sanjoy Pal

  2. ALICEmuonSpectrometer Physics Goals : Studying heavy quark production via their muonic and semi-muonicdecay in Forward rapidity (-4 < y < -2.5) Large quarkonia acceptance down to pT0 Measurement of Quarkonia production  
- as a function of centrality (ZDC) 
- as a function of pT, rapidity  St1 and St2 Quadrants type y Muon Tracking System: Five stations Two detection planes for each station. Detection plane consists of Multi wire proportional chambers with bi-cathode pad readout: bending and non-bending.   Expected Spatial resolution below 100 m in the bending plane, around 700 µmin the non-bending z x St3 , St4 and St5 Slatstype muonSpectrometer Sanjoy Pal

  3. Muon Tracking System Muon Tracking System: The total area of covers about 100 m2 Total number of readout pads about 1 million Gas Mixure : Ar + CO2 (20%) High Voltage : 1650 Volt Wire diameter : 20 µm Wire pitch : 2 mm for St1 : 2.5 mm for St 2,3,4 & 5 Anode cathode gap : 2 mm for St1 : 2.5 mm for St 2,3,4 & 5 Pad width y direction for Bending Cathode 4 mm for St1 5 mm for St 2,3,4 & 5 Pad width x direction for Non-bending Cathode 6 mm for St1 7.5 mm for St 2,3,4 & 5 The chamber thickness : 0.03 X0 MuonDipole Magnet (Bx) : B=0.7 T, ∫Bdl ~ 3 Tm Sanjoy Pal

  4. Readout buspatchesconfiguration for the NonBending plane in redbuspatchs which are present in configuration In white buspatchs which are removed from configuration Sanjoy Pal

  5. Readout buspatchesconfiguration for the Bending plane 5% of the Read out Channel are removed form configuration Sanjoy Pal

  6. Pedestal Bending (max 500 ADC Channel) in black MANU`swhich are also dead Sanjoy Pal

  7. PedestalNonBending(max 500 ADC Channel) Sanjoy Pal

  8. NoiseBending (max 5 ADC Channel) 1 ADC Ch ~ 1000 e Noise below 3 ADC Ch for most of the read out Channel and average around 1.5 Ch which is very good Sanjoy Pal

  9. Noise Non Bending (max 5 ADC Channel) Noise is higher compare to bending plane but it is less critical Sanjoy Pal

  10. //===========================================================================//=========================================================================== // NEW File calculated by makeped //=========================================================================== // * Statistics :400 // * # of MANUS : // * # of channels : // //--------------------------------------------------------------------------- • //format : //--------------------------------------------------------------------------- // BUS_PATCH MANU_ADDR CHANNEL MEAN SIGMA //--------------------------------------------------------------------------- 1 4 0 112.572 0.869952 1 4 1 207.938 0.891154 1 4 2 212.385 1.06901 1 4 3 242.233 0.977093 1 4 4 302.468 1.02615 1 4 5 221.775 0.918899 1 4 6 263.75 1.00871 1 4 7 185.86 0.984073 1 4 8 241.141 0.943991 1 4 9 246.949 0.919999 • 4 10 209.31 0.89883 … Zero-Suppression The pedestal and noise per readout channel  give threshold for 0-suppression : critical parameter ! • Mean and sigma values of pedestals for each readout channel are calculated by DA over 400 event • Flat ASCII file • Pedestal and noise distribution for one plane of a quadrant Zero-Suppression is performed by FEE (MARC). Sanjoy Pal

  11. High Voltage configuration 1400 V Nominal HV = 1650 volt 1500 V Sanjoy Pal

  12. Total Cluster charge distributions in pp run 2010 Station 1 have relatively High gain Station 2 have relatively low gain compare to Station 3, 4 & 5 Absolute values of gain are not important for position resolution calculation Sanjoy Pal

  13. No of pad hits in the B plane involved in a cluster for each chamber 3 Pad hit in bending direction is needed for nominal position resolution Sanjoy Pal

  14. No of pad hits in the NB plane involved in a cluster for each chamber Sanjoy Pal

  15. Charge correlation between two cathodes Station 2 Station 1 Station 3 Station 4 Station 5 Sanjoy Pal

  16. Occupancy Bending (max 0.01) Mean Occupancy ~ 0.002 Sanjoy Pal

  17. OccupancyNonBending(max 0.01) Sanjoy Pal

  18. ChamberEfficiency Condition to reconstruct a track : one hit among chambers 1 & 2. one hit among chambers 3 & 4. one hit among chambers 5 & 6. three hits among chambers 7, 8, 9 & 10. Total tracking efficiency for LHC10e : Total = 93.7 ± 0.9 % Sanjoy Pal

  19. Summary • Wehave a quite stable read-out configuration with a busy time most often less than 500 μs ; baseline is 330 μs. • We have a quite stable HV configuration. • Excellent behavior of all the Muon Chambers was achieved during pp run-2010. • Tracking efficiency ~95% • Ready for HI data taking. Sanjoy Pal

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