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Dimuon Spectrometer : Status of the tracking chambers

Dimuon Spectrometer : Status of the tracking chambers . What’s in – what’s out Review of the components Chambers efficiency My personal view of the priorities for the shutdown. Christophe.Suire@ipno.in2p3.fr. ALICE Dimuon Spectrometer. y. z. x. Dimuon Spectrometer.

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Dimuon Spectrometer : Status of the tracking chambers

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  1. Dimuon Spectrometer :Status of the tracking chambers • What’s in – what’s out • Review of the components • Chambers efficiency • My personal view of the priorities for the shutdown Christophe.Suire@ipno.in2p3.fr

  2. ALICE Dimuon Spectrometer y z x Dimuon Spectrometer

  3. What’s in – what’ out MCHVIEW of the noise At best we took data with stations 1,2 and 5, chamber 5, chamber 7 outside/left.

  4. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Pedestals, noises, gains Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ Monitoring MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG SHUTTLE

  5. MCH Readout : Crocus/Trigger Readout the MCH, manage busy and send data to DAQ • annoying bugs found (causing busy of our readout) • good handling of trigger sequences with : • reject • errors • compliant with latest ALICE DAQ and Trigger (CTP) requirements • nice tool (interfaced to our trigger crate) to monitor the busy of readout/Crocus. • implements a full reset “button” • Some news problems ? • lost connection with 2565 and 2577  more about this in the last slides

  6. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ Monitoring MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains SHUTTLE

  7. ; Pedestal file generated by makeped ; ; structCrocusCmdHeader ; uiChecksum eCrocusCommand uiFrtCrtTargetIds[2] 0x00010006 0x00000006 0x00020000 0x00030000 ; structFrtCrtCmdHeader #0 ; uiChecksum uiFrtCrtIdTarget uiFrtIdTargets[5] 0x000f0000 0x00020000 0x00050000 0x000b0000 0x00090000 0x000d0000 0x00070000 ; structFrtCmdHeader #0 ; uiChecksum eCrocusCommand uiFrtIdTarget 0x00050005 0x00000006 0x00050000 ; FRT 0x00050000 Lport 0 -> BP 6 0x00000003 0x00000000 0x00000000 ; FRT 0x00050000 Lport 1 -> BP 7 0x00000003 0x00000000 0x00000000 ; FRT 0x00050000 Lport 2 -> BP 8 0x00000003 0x00000000 0x00000000 ; FRT 0x00050000 Lport 3 -> BP 9 0x00000003 0x00000000 0x00000000 ; FRT 0x00050000 Lport 5 -> BP 10 0x00000003 0x00000000 0x00000000 ; structRawDataHeader ; uiHeaderChecksum bLastChunk uiRawDataLength uiRawDataChecksum 0x02900353 0x00000001 0x000003cf 0x0290009d ; RawData ; Lport 0 -> BP 6 with 3 manus ; Manu 16 (0x00400000) 0x00400000 0x000000c2 0x00000106 0x000000d1 0x00000073 0x00000101 …. //=========================================================================== // NEW File calculated by makeped //=========================================================================== // * Statictics : 1000 // * # 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 … MCH Detector Algorithm The DA computes data taking condition parameters • pedestal and noise per readout channel  (μ,δ) give threshold for 0-suppression : critical parameter ! • Mean and sigma values of pedestals • CROCUS Thresholds file  FEE • Flat ASCII file  SHUTTLE

  8. x>xt: f2(x)=f1(xt) +a1 (x-xt) +a2 (x-xt)2 9 a2=1.6 E-04 P(2)=0.673 8 a0= - 347.21 a1= 1.1305 P(2)=0.934 7(t) x-xt 6 5 Input DAC values (pad side) 4 3 threshold 2 x<xt : f1(x)=a1 x + a0 1 Measured DAC values (Data) MCH Detector Algorithm The DA computes data taking condition parameters • gain per readout channel Calibration method : linear + parabolic fits 9 (11 nowadays) DAC values + 2 functions => 3 parameters: a1, a2, threshold (xt) //=================================================// BP MANU CH. a1 a2 thres. Q//================================================= 1 3 0 1.0948 2.342e-04 1776 f7 1 3 1 1.3002 3.516e-04 1490 f7 1 3 2 1.3166 1.069e-04 1495 fe 1 3 3 1.3657 1.505e-04 1439 fd 1 3 4 1.3649 9.960e-05 1444 fe ………..…. • Flat ASCII file  SHUTTLE

  9. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ Monitoring MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains SHUTTLE

  10. MCH Shuttle Shuttle transfers data taking condition parameters • gain per readout channel (calculated by the DA) • pedestal and noise par readout channel (calculated by the DA) • all high voltage channels (stored in the DCS database) to the Offline Condition DataBase (0CDB)  mandatory for the offline analysis. MCH : • pedestals, noises and gains = OK • (DA updated recently to better handle parity errors) • high voltages should be soon ok • old problem now clearly identified and being solved • GMS not tested/implemented !!

  11. Physics/PRL Ventilation Gas flow High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data ALICE DAQ Monitoring MCH components review (simplified view!) Detector Control System FEE Sw interlocks Offline analysis MCH detector FEE OCDB SAFETY Hw interlocks Physics Data MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains SHUTTLE

  12. MCH alignment : Photogrammetry and Survey • Survey and Photogrammetry provides Day 0 misalignment file • Survey chamber with respect to ALICE • Photogrammetry slat or quadrant with respect to chamber • Available for this run: • chambers 1, 2, 3, 4 & 5 Ch1 Ch5 Javier Castillo

  13. MCH alignment with tracks • Global method: • Simultaneous fit to misalignment and track parameters • Millepede • Input misalignments: • Uniform • |X,Y|<300 m • ||< 500rad • Alignment precision: • RMSX = 20 m • RMSY = 10 m • RMS = 20rad 100k - 150k is a reasonable number Javier Castillo

  14. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains SHUTTLE Monitoring

  15. MCH data monitoring : MOOD MOOD (Monitoring Of Online Data): • Tools for experts. • Reads and Decodes raw data from either online stream or file. • Visualisation of general information : pedestal, noise, gain, hitmap, errors, etc. • Used for commissioning (noise display) and during cosmic runs (first cluster)

  16. MCH data monitoring : AMORE AMORE (Automatic MOnitoRing Environment): • Tools for shifters. • Reads and Decodes raw data from online stream. • Checks and reports the quality of data (at the raw data level only) • Interfaced with the Quality Assurance framework of AliRoot. • Tells to the shifter if we are taking crap or not and give a first diagnostic to the expert. • Under development. MCHview-like display of information

  17. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains SHUTTLE Monitoring

  18. MCH Safety : Interlocks In terms of detector safety, you always want the belt and the straps • power dissipated by the FEE required air cooling • if air cooling stops  shutdown the low voltages • high voltages on the wire required clean Ar/CO2 mixture • if input gas stops  lower the high voltages “Hardwired” interlock for air cooling • St1&2 cabled, tested and operating • St3 cabled • St4&5 to be done (not critical) [for the gas system, hardwired interlock could be cabled but it clearly appears unnecessary] “Software” interlocks (to be implement in DCS : work started) • if temperatures sensors reach a too high value  stop the LVPS • if gas input or output flow is null  set the HV to BEAM_TUNING Ultimately, shifters (in ACR) should not be necessary for MCH safety  Presence on site of an-call expert

  19. Physics/PRL Ventilation Gas flow Offline analysis OCDB High Voltages Low Voltages Geometry Monitoring System (GMS) Physics Data Physics Data ALICE DAQ MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks MCH Readout CROCUS Castor CAF LCG Pedestals, noises, gains HLT SHUTTLE Monitoring

  20. HLT online display : the detector best friend/advertiser Worked nicely in Feb/March ; TPC wasn’t running thus the “MUON TV” was on

  21. HLT online display : the detector best friend/advertiser New implementation (better integration in Alieve) tested currently at CERN (HLT group) : ready for the first collisions…? Pedestal Display http://idas.web.cern.ch/idas/onlinedisplay/

  22. HLT online display : the detector best friend/advertiser New implementation (better integration in Alieve) tested currently at CERN (HLT group) : ready for the first collisions…? Simulated Cluster http://idas.web.cern.ch/idas/onlinedisplay/

  23. HLT online display : the detector best friend/advertiser New implementation (better integration in Alieve) tested currently at CERN (HLT group) : ready for the first collisions…? Simulated Track http://idas.web.cern.ch/idas/onlinedisplay/

  24. Physics/PRL Ventilation Gas flow Offline analysis OCDB MCH Readout CROCUS High Voltages Low Voltages Pedestals, noises, gains Geometry Monitoring System (GMS) Physics Data ALICE DAQ Physics Data Monitoring MCH components review (simplified view!) Detector Control System FEE Sw interlocks MCH detector FEE SAFETY Hw interlocks Castor CAF LCG SHUTTLE

  25. MCH chamber efficiency for p+p 2008 run (ped. run 58492 12/09/08) station 1 station 2 station 3 station 4 station 5

  26. Propositions….and my personal answers • Station 1 : 3 patch buses to fix • qualitatively we can say that manas die continuously (see last slide) • Station 2 : changing DE 303 (bottom quadrant on chamber 3 left) ? • no : to risky for chamber 2 and 4. High probability to cause more damages than solving problems • Chamber 4 at 99%, and then chamber 3 < 75% • Station 3 • one FRT to change (not sure but best guess) • and try to improve the arrangement of the patch cables so nobody will ruin them (in my opinion, someone stomp –not step- on them) • a dedicated team working on the noise of ch5 • no lead so far (aluminum sheets help but not help the Xo) • should not jump from commissioning to noise testing for 2 hours and then back to commissioning, etc…. • Ch6 should be open and should not be connected before the noise is understood

  27. Propositions….and my personal answers • Station 4 : • Chamber 7 right should be the priority • after full chamber 7 is readout correctly and only after that, one should think about working on chamber 8 • Station 5 • we had the 4 crocus of station 5 in the readout (next slide) • missing DE • when can they be repaired (if this is possible) • is it worth to open the chambers to put them back • some patch buses exhibit large fluctuations  full bus patch over the threshold  slows down the readout • simplest is to remove them from configuration • check voltages on the power lines ?

  28. General issues • During the run (no work around the detector), we lost contact with : • 10 patch buses on ch5  most probably the FRT • Crocus chamber 9 right (sylvain couldn’t fix) • Crocus chamber 3 left 2565 ?  works fine now : “downward spiral” effect... + Crocus chamber 10 right became unstable (readout is fine and then not) after some time… Demonstrates the importance to perform long readout test before the cavern close. This needs to be understood as soon as possible : changing the board is not sufficient ! • CRT/FRT must be returned to Orsay with proper form and proper packaging (anti-static) • The database on the Twiki must be updated • Commissioning logbook must be updated with relevant information It might appear a bit tedious but it is the only way to pinpoint and understand if problems are related to DSP/EPROM

  29. General issues • MANAS are still dying with time (not investigated more). All station should provide some input to ?? • I suggest to have somebody working on that  best/easiest way : compare pedestal runs vs time (global tool)  someone from India ? • Power supplies : clearly the modified LVPS do not have a dramatic effect on the noise. • Still some fluctuations ; all noises of St3,4,5 increased during week 37 • Modifying the others LVPS (St1 and 2) would be a mistake : no clear gain or better understanding of the noise with the modified LVPS • HV on quadrants/slats : a few can not hold the nominal voltages. But the current configuration is stable (see MCH twiki for details) • can be easily tested in from the ACR (by slowly rising up the voltage and checking the stability)

  30. General issues • Something must be done to avoid the screwdriver incident ! Access in the FASS, operation around/in the dipole or near station 4/5 should be supervised.  We need to settle down a procedure with the Alice operation group to get, at least, informed.

  31. Spares slides • First Physics • more on trigger chambers • Javier’s slides on alignment • Jean-Luc slides on calibration : pedestal, noise, gain, fit quality Thanks to Indranil,Javier,Jean-Luc, Guillaume,Laurent for preparing some slides for me

  32. MUON Spectrometer performances: J/ • 10k J/ in acceptance • Full simulation • “Hit errors” increased by 1mm to keep constant efficiency • Resolution ~ 100 m seems satisfactory • Resolution ~ 50 m perfect Javier Castillo 32

  33. MUON Spectrometer performances:  • 10k  in acceptance • Full simulation • “Hit errors” increased by 1mm to keep constant efficiency • Resolution < 50 m needed Javier Castillo 33

  34. MUON performances - momentum resolution Muons from J/ Muons from  X,Y=1000 m X,Y= 700 m X,Y= 500 m X,Y= 300 m X,Y= 100 m X,Y= 50 m X,Y= 0 m Javier Castillo 34

  35. MUONTRK_DA : Pedestal mean value Pictures obtained after analyzing 3 runs: [St_1] , [St_2 + ½ Ch_5 + ½ Ch_7], [St_5]

  36. MUONTRK_DA : Pedestal sigma value Ch_5 (St_3) are particularly noisy Noise has to be improved insome slats of St_5 Right

  37. MUONTRK_DA : gain parameter a1 Green color indicates Gain mean values around 4 mV/fC

  38. MUONTRK_DA : linear quality fit [range: from 1 (bad) to 15 (good)] For un-calibrated channels (no a1 extracted) : quality fit codes are forced to 0 and a1 to 0.5

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