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Preliminary Studies of PMTs of Modules in Emergency Mode Using the Laser System

Preliminary Studies of PMTs of Modules in Emergency Mode Using the Laser System. 30/04/2013 CERN-Oujda. Outline. General Description Motivation LB Modules in Emergency Mode EB modules in Emergency Mode Conclusion. General Description. Mecanical Structure of Atlas Tile Module :

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Preliminary Studies of PMTs of Modules in Emergency Mode Using the Laser System

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  1. PreliminaryStudies of PMTs of Modules in Emergency Mode Using the Laser System 30/04/2013 CERN-Oujda

  2. Outline • General Description • Motivation • LB Modules in Emergency Mode • EB modules in Emergency Mode • Conclusion

  3. General Description • Mecanical Structure of Atlas Tile Module : • Samplingcalorimeter: iron + Scintillatingtiles • Signal transported by WaveLengthShifteropticalfibersfromscintillatingtiles to the PMT's. PMT Fibre WLS  < 1.7 EBA LB Tile Étendu A EBC Central R ~10 m L ~13 m 2500 t Double lecture Étendu C Module (64 Modules/Barrel) 3 Barrels R Z Hadrons and Muons (LASER for calibration) 64 modules4 ~460000 tiles, ~640000 fibers and ~10000 PMTs

  4. Motivation • 3 TileCal modules are in EM in 2012; • Wedon’t know wether the PMTs in the EM are linear; • Laser light canbeused for such a study; • The ideais to compare the responses of PMTs in EM and of PMTs in normal mode. • Differentrunscontainingdifferentfilterswheel are used, allowing to apply a specificattenuation factor from 3 to 1000 to the laser beam. • NB: the runswe are using have been takenin periodwhenonly 2 modules are in EM. | attenuation | filterwheel | runnumber|  -----------------------------   | 1               |  5              | 208762 |-   | 3               |  6              | 208758 |   | 10             |  4              | 208767 |   | 32             |  3              | 208770 |   | 100           |  2              | 208772 |   | 320           |  8              | 208755 |   | 1000         |  7              | 208756 |   -----------------------------------------------------

  5. 1. LB Module in EM PMTr: PMT belong to Module in normal mode PMT (EM): PMT belong to Module in Emergency Mode • In this case wewill use the propertythat one fibercanbelong to PMTr and to PMT (EM) simultaneously.

  6. LB: PMT response of Module in Normal Mode UsingFiltersAttenuations

  7. LB: PMT response of Module in EM UsingFilterAttenuation

  8. LB: Module in EM • The meanenergy of PMTs (EM) as function of meaneneregy of PMTr for : • Module 28: -> LBA, PMTr 27 -> LBC, PMT(EM1)26

  9. LB: Module in EM • For comparaison we show also the plots obtainedusingtwoPMTsfed by the samefiberbothbelonging to module in normal mode • Module 12: -> LBA PMTr 14 -> LBC PMT 15 The latest point on the right is out of the linearshape; for high signal the PMT’s are saturating.

  10. 2. EB: PMTsResponses In the Extended barrel case, each module isfed by one fiber, • -> sincePMT(EM) and PMTrcannotbelonging to the samefiber , We use to study the linearity of PMT(EM) a PMTr of an arbitrary module in a given partition..

  11. 2. EB :PMT response of Module in normal mode

  12. 2. EB :PMT response of Module in EM

  13. EB: Module in EM • Module 17 : ->EBA,PMTr12 • Module01 : ->EBC, PMT(EM)15 • Module 07 : ->EBA, PMTr 12 • Module 02 : ->EBC PMT 15.

  14. Conclusion • PMTs(26,27) responsesat LB module 28 have maximal variation ~1.7%

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