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SSD status

SSD status. Enrico Fragiacomo – INFN Trieste. Outlook . MC-data comparison Cluster finder dE / dx Material budget in geometry. MC-data # recpoints ratio mod-by-mod. Ramona L. 900 GeV sim pp and real data from run 104799. Strongly depends on sim production and run dates! See later….

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SSD status

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  1. SSD status Enrico Fragiacomo – INFN Trieste

  2. Outlook • MC-data comparison • Cluster finder • dE/dx • Material budget in geometry

  3. MC-data #recpoints ratio mod-by-mod Ramona L. 900 GeVsim pp and real data from run 104799 Strongly depends on sim production and run dates! See later… p0: 1.02244 +/- 0.0119124 p0: 1.01755 +/- 0.0109631

  4. MC-data recpoints ratio lad-by-lad Selected modules from previous slide removed!

  5. MC-data bad channels ratio V2 map in OCDB before March, 31th V3 map in OCDB after March, 31th Run 114786 from March, 30th

  6. Data-MC consistency in Calibration Objects • MC objects: • BadChannelsSSD & NoiseSSD updated on March 31st • Used from LHC10b1 (run 114786) • GainSSDupdated on February 22th • Globally (fixed map): • BadChannels on Pside: 10.81% • BadChannels on Nside: 8.92% • DATAobjects: • BadChannelsSSD& NoiseSSDupdated at each Physics fill (~daily) • GainSSDupdated on February 22th • Possible relevant run-by-run fluctuations in DATA of the BadChannels number : • module #1548 – P side: completely off in some runs • fluctuation in ~30 module-Psides on Layer6 (sensitive to humidity): • hundreds of channels can be off in some runs (128ch =1/6 module-side) • statistical fluctuation (3σ-noise cut for BadChannels) • Globally (April2010 distribution): • BadChannels on Pside: 10.92% - RMS = 0.07% • BadChannels on Nside: 8.94% - RMS = 0.01% Mino C.

  7. DIFFENCE BETWEEN BAD CHANNELS (Simulation-Data) V3 sim and data from run 114918 1548 1608 1618 1010 MOD 1010: p-side sintef noise -> not insulated SSD Numeration (0 - 1698) MOD 1548: P-side off in some runs MOD 1608: p-side sintef noise -> not insulated MOD 1618: p-side sintef noise -> not insulated

  8. DIFFENCE BETWEEN BAD CHANNELS (Simulation-Data) V3 sim and data from run 114918 635 SSD Numeration (0 - 1698) MOD 635: n-side very low noise -> tagged as 'dead' in the calibration run used for the simulation but alive during the data taking!

  9. Summary (1/2) Mino C. • All modules with ratio <0.8 and >1.2 have been checked • Almost all of them reflect a different condition in the DATA-MC OCDBs. • For the other smaller discrepancies: the spikes above 1 correspond in most of the cases to the last module in a ladder (position 22). • Structures on the half-ladder basis: in many cases the A-side half-ladder has a lower ratio with respect to the corresponding C-side half-ladder.

  10. Summary (2/2) • 9 modules with ratio < 0.8: • 1 P-side off in some runs (2048) • 6 P-side noisy (strips not insulated) (2108,2118,1510,1506,1629,1860) • 2 modules with very low noise on one side--> tagged as bad (525, 1135)-->probably to include back! • 1 module with ratio > 1.2 • always good about noise, many channels masked because of old defects, now recovered (1154) --> to include back! • general: • module in position 22 always higher ratio (~1.1) • module in position 1 often lower ratio • A-side lower ratio wrt C-side

  11. Cluster finder • Activity ongoing on the cluster finder optimization (Sasha B.+EF): • some small fixes in the clusterization • tricks to speed it up (as suggested by the HLT), • eta distribution

  12. dEdx Marek C. MPV as function of module number for different 7TeV runs and pass6 of 900 GeV.Main conclusion: The gain looks to be stable in time but there are few bad modules which have huge fluctuation on gain. They  are under investigation

  13. Material distribution from conversions Savannah 63965 F. Bock SDD, SSD show 10-20% more conversions than expected SPD situation unclear; depends on V0 finder?

  14. Labeling conversions in MC Added code in AliITSv11Hybrid::StepManager to histogram conversions

  15. Material SSD Table from design: Main contributions: Sensor (42%), ladder cables (18%), spaceframe (8.5%), cooling tubes+water (7.8%)

  16. Main missing components Cross-checked contributions in MC with table, good agreement found All large contributions accounted for Few small parts missing: metal caps on capacitors + solder, approx. 0.18 g per module (out of 2.66 g per module, 6.371 g ladder segment) 0.05 % X/X0 out of 0.876 % total Added to MC, not committed yet. Will reduce discrepancy

  17. Latest news • The main update is that everything has now been committed to AliRoot trunk. The changes are: • inclusion of metal endcap of capacitors+solder • change of density carbon-fiber 1.6 -> 1.8, also for support cone. • some small changes to ladder cables: increase in kapton, decrease Al, accroding to measurements Ton; net effect of this is probably negligible.

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