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The ECAL Irradiation Efforts made during the Summer

The ECAL Irradiation Efforts made during the Summer. June, 22 – presentation to LTEX (LHC Tunnel and Experiments study group) Four ECAL inner modules assembled and equipped with 36 PMT’s CW bases modified to allow DC readout with integrators (like in HCAL)

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The ECAL Irradiation Efforts made during the Summer

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  1. The ECAL Irradiation Efforts made during the Summer • June, 22 – presentation to LTEX (LHC Tunnel and Experiments study group) • Four ECAL inner modules assembled and equipped with 36 PMT’s • CW bases modified to allow DC readout with integrators (like in HCAL) • PMT’s have been checked and relative gain tabulated with same LED • July, 1 –Presentation to LHC Machine Committee–accepted • On July, 15 support bench and cables installed in the LHC tunnel • Beam-test run held on August, 19-20 at SPS H4 beam-line • A radioactive source scanning stand assembled and all SW developed • Scan with 137Cs source (RP-41886, ~10 mCi), run held on August, 27 in b.156 under inspection of RP representative • Two ECAL modules with dosimeters installed in RB84 tunnel on September, 2 • Two remaining modules to be shipped to Protvino (~ September, 20) following are some preliminary results of measurements 09.09. 2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  2. The ECAL Irradiation ECAL modules and PMT’s Gmax/Gmin ~ 5 Relative PMTs gain @ HV=720V with LED 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  3. The ECAL Irradiation Support installation in the LHC tunnel On July, 15 the access in to the LHC tunnel has been GRANTED The support and cables for active dosimeters read-out were arranged and fixed to the ground ~15 cm 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  4. The ECAL Irradiation The beam-test run 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  5. The ECAL Irradiation The beam-test run (calibration) 121.2mm Beam direction Mod 2 Mod 4 Trigger counters 45 x 25 mm Beam position hodoscope 32x32mm, 1mm pitch Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  6. The ECAL Irradiation The beam-test run (calibration) All PMT’s @ same voltage HV=750 V The trigger delay (start strobe) increased by +50 ns to allow several pedestal samples recording before signal The SPS H4 beam-line has been tuned for 70 GeV positrons Beam position adjusted for maximal counter coincidence rate using TRIM magnets The beam position relative to cell tuned once by equalizing the response in adjacent channels Each cell centered remotely by 4cm displacement in X and Y Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  7. The ECAL Irradiation The beam-test run (calibration) All PMT’s @ same voltage HV=750 V The trigger delay (start strobe) increased by +50 ns to allow several pedestal samples recording before signal The SPS H4 beam-line has been tuned for 70 GeV positrons Beam position adjusted for maximal counter coincidence rate using TRIM magnets The beam position relative to cell tuned once by equalizing the response in adjacent channels Each cell centered remotely by 4cm displacement in X and Y START Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  8. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 553 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  9. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  10. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  11. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 558 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  12. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 559 558 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  13. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 559 558 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  14. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 558 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  15. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  16. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  17. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 564 556 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  18. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 564 556 565 553 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  19. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 564 556 565 553 566 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  20. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 564 556 565 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  21. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 558 563 557 564 556 565 569 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  22. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 559 562 572 558 563 557 564 556 565 569 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  23. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 573 559 562 572 558 563 557 564 556 565 569 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  24. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 560 561 573 559 562 572 558 563 574 557 564 556 565 569 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  25. X Y Beam profile Calibration @ 70 GeV positron beam The ECAL Irradiation The beam-test run (calibration) 10mm 560 561 573 559 562 572 558 563 574 557 564 575 556 565 569 8mm 553 566 568 Calibration @ 70 GeV positron beam 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  26. The ECAL Irradiation The beam-test run (calibration) Energy in ECAL after calibration (no energy leak corrected at modules side so far ) 70 GeV Calibration with beam yields correction only within 25% in addition to PMT gain 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  27. The ECAL Irradiation The beam-test run (resolution) High statistics energy resolution study @ positron energies E= 20, 40, 70, 100 GeV Beam purity ~ 98 % Beam purity ~ 98 % 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  28. The ECAL Irradiation The beam-test run (resolution) High statistics energy resolution study @ positron energies E= 20, 40, 70, 100GeV Beam purity ~ 97 % Beam purity ~ 95 % ~5% empty 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  29. The ECAL Irradiation The beam-test run (resolution) 100 GeV Combined pedestal width σ(P) = 0.59 GeV 20 GeV 40 GeV 70 GeV Pedestal fit Resolution correction σ2 = σ2(E) - σ2(P) 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  30. The ECAL Irradiation The beam-test run (resolution) Mod 2 The measured resolution fit for two modules σ/E = 7.3/√E + 1.0 (%) σ/E = 7.2/√E + 0.9 (%) O Mod 4 O 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  31. The ECAL Irradiation Scan with Radioactive Source As it was thought on June,19 Laptop Lead control ECAL module HCAL Integrators CAN-bus read D INR, Moscow Laptop To be done in shielded bunker (near lift in cavern) Scan 4 modules = ½ day once per year 137Cs radioactive source in movable Pb brick 3mm/s ~380s scan cycle b.156 Control 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  32. The ECAL Irradiation Scan with Radioactive Source ECAL module Garage Moving tool Control Integrators Source Laptop, MV control behind wall Stand for scan in b.156, “blue zone” 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  33. The ECAL Irradiation Scan with Radioactive Source 3 2 1 6 5 4 9 8 7 Channel numbering LED -- PhotoDiode Feed-screw rotation monitor 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  34. The ECAL Irradiation Scan with Radioactive Source • Each cell scanned 4 times: • forward – backward • module right - reversed 3 2 1 6 5 4 9 8 7 Right Reversed F B 3 2 1 6 5 4 9 8 7 6mm Anode currents: Mod4, Right, Forward 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  35. The ECAL Irradiation Scan with Radioactive Source 3 2 1 6 5 4 9 8 7 Tile Module 2 has some irregularities in Light yield in central cell Possible source of worse resolution? 4 X0 10 X0 Scan: Mod2, Right, Forw 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  36. The ECAL Irradiation Installation in the LHC tunnel September 2, mod2 and mod4 installed in RB84 mod1 and mod3 ready for shipment to Protvino on September 20 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  37. The ECAL Irradiation CONCLUSIONS • Joint efforts allow to solve difficult administrative problem – • – get an approval to occupy the LHC tunnel • Four ECAL modules and PMT/CW were prepared for a long-term irradiation study • The beam-test with all modules provide an objective data as the reference starting point • Powerful scan tool has been designed, constructed and used with radioactive source • Data obtained represent alternative approach to degradation study under irradiation • ECAL modules equipped with radiation dosimeters (active and passive) installed in RB84 • Two modules ready for shipping to Protvino: • high-rate dose irradiation at 70 Gev synchrotron in December run; • to be shipped back to CERN next year 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

  38. The ECAL Irradiation Participating team and acknowledged persons J.Lefracois, M.-N.Minard – proposed idea and valuable support, F.Manchefert, – coordination activities with LHC, conducting scan run, dosimeters I.Matchikhilyan – selection and providing of PMT’s, Y.Guz – preparation modules and calibration PMT’s, conducting beam-test, design SW for scan set-up and processing scan data, V.Matveev – design and implementation a CAN-bus control of the scan set-up, E.Chernov – design, construction and assembly of scan set-up, mechanical works in tunnel (fix support, arrange cables) V.Obraztsov – organizing and conducting beam-test, V.Talanov – MC calculations of dose rates in the RB84 tunnel and LHCb detector, V.Polyakov(COMPASS) – preparing test area on H4 SPS beam-line (cables, detectors), providing beam-time despite of very tight own schedule , S.Donskov(COMPASS) – setting online DAQ during beam-test, processing data, D.Lacarrier – design and arrangement in the tunnel, D.Macina – enthusiastic support in all activities with LHC authorities, L.Roy – dosimeters preparation, gluing, connectors installation in the tunnel, SPS crew – excellent operation of the accelerator during the night shift on August 19-20. 09.09.2009 Rustem DZHELYADIN (CERN&IHEP, Protvino)

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