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

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This report presents preliminary findings from the study of Photomultiplier Tubes (PMTs) in Emergency Mode (EM) using a laser system. We focus on high-energy responses and linearity assessments of PMTs from both the Low Barrel (LB) and Extended Barrel (EB) modules. The investigation includes comparing responses from PMTs operating in normal and emergency modes, utilizing various attenuation factors to ensure precision. The results reveal that responses in EM differ minimally, with a variance of about 1.7% in PMTs, thus validating the use of lasers for calibration in these conditions.

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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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