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Update on the PHENIX Calorimeter Prototypes

Update on the PHENIX Calorimeter Prototypes. Craig Woody BNL. EIC Calorimeter Group Meeting April 17 , 2014. EMCAL Tilted Plate Configuration. Monte Carlo Simulation (Flat plates - No Accordion). Energy Resolution vs Tilt Angle. 1mm W + 1mm Fiber. A.Kiselev. Absorber Stack.

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Update on the PHENIX Calorimeter Prototypes

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  1. Update on the PHENIX Calorimeter Prototypes Craig Woody BNL EIC Calorimeter Group Meeting April17, 2014

  2. EMCAL Tilted Plate Configuration Monte Carlo Simulation (Flat plates - No Accordion) Energy Resolution vs Tilt Angle 1mm W + 1mm Fiber A.Kiselev C.Woody, EIC Calorimeter Meeting, 4/17/14

  3. Absorber Stack Looking through absorber stack Readout end of absorber stack Stack of 7 tower modules (not yet glued) Readout has 7x7 optically separated towers Readout end of module is potted with white reflecting epoxy. Other end is covered with 3M ESR reflector X0~7 mm RM ~ 2 cm C.Woody, EIC Calorimeter Meeting, 4/17/14

  4. Light Collection Cavities Assumed one SiPM per cavity to minimize cost Many prototypes were tested to determine the placement of the SiPM in order to optimize light collection efficiency and uniformity Seven rows of seven cavities mounted to a frame and readout boards are connected at the back C.Woody, EIC Calorimeter Meeting, 4/17/14

  5. Light Collection Efficiency and Uniformity 20° from center Average efficiency = 4.7% Max/Min ratio = 1.7 45° from center Average efficiency = 4.2% Max/Min ratio = 1.6 SiPM entered on dome Average efficiency = 4.6% Max/Min ratio = 2.2 Area ratio (3x3 mm2 SiPM to 25x27 mm2 cavity) = 1.3% S. Stoll C.Woody, EIC Calorimeter Meeting, 4/17/14

  6. LED Calibration System 1:8 split 1:7 split SiPM LED Pulser PIN diode for monitoring LED Splitter fixture for testing uniformity and efficiency of 1x7 splitters 1x7 splitter for distribution of calibration light to light collection cells C.Woody, EIC Calorimeter Meeting, 4/17/14

  7. Final Light Collection Module C.Woody, EIC Calorimeter Meeting, 4/17/14

  8. Final Assembly C.Woody, EIC Calorimeter Meeting, 4/17/14

  9. Final Assembly C.Woody, EIC Calorimeter Meeting, 4/17/14

  10. Fermilab Beam Test C.Woody, EIC Calorimeter Meeting, 4/17/14

  11. Fermilab Beam Test sPHENIX HCAL sPHENIX EMCAL • Test of combined EMCAL and HCAL prototypes at Fermilab in Feb 2014 • (sPHENIX 2/5-2/25, STAR 2/26-3/18) C.Woody, EIC Calorimeter Meeting, 4/17/14

  12. Upstream of the Calorimeters C.Woody, EIC Calorimeter Meeting, 4/17/14

  13. Measurement of Electrons with PbGl C.Woody, EIC Calorimeter Meeting, 4/17/14

  14. LED Pulser Calibration 7x7 Tower Array All channels working and giving reasonable signals C.Woody, EIC Calorimeter Meeting, 4/17/14

  15. MIP Peak 120 GeV protons Achim F. C.Woody, EIC Calorimeter Meeting, 4/17/14

  16. Calibration of Towers with Beam Plates perpendicular to beam (90°) 120 GeV protons Minimum ionizing peaks correspond to ~ 30 MeV per tower Achim F. C.Woody, EIC Calorimeter Meeting, 4/17/14

  17. Measurement of Light Output • Light yield ~ 100 p.e. on PMT • Energy deposit = 29 MeV • - total energy deposit from mip traversing perpendicular (12 layers) of one tower of absorber stack • 3.5 p.e./MeV • 3500 p.e./GeV • Assume 90% light collection • 3900 p.e./GeV in calorimeter • Light collection efficiency of 4.7% from cavities  ~ 180 p.e./GeV with SiPM (assuming PDESiPM  QEPMT) •  ~ 7.5% contribution to energy • resolution from photon statistics • PMT coupled directly onto one tower module of absorber stack (12 layers) • Beam (120 GeV p) traverses tower perpendicular to plates (Edep = 29 MeV) • Light yield measured in three positions across tower module C.Woody, EIC Calorimeter Meeting, 4/17/14

  18. Tower Readout with SiPMs Test with 3 central rows of towers with 2 SiPM readout Horizontal scan of with MIPs x2 2 SiPMs MIPs in single towers 1SiPM J.Haggerty C.Woody, EIC Calorimeter Meeting, 4/17/14

  19. Transverse Position Dependence Using hodoscope (8 slats x 5 mm) – 8 GeV electrons 3x3 Tower Sum Single Tower ~ 5% Achim F. C.Woody, EIC Calorimeter Meeting, 4/17/14

  20. Longitudinal Position Dependence 5 different calorimeter positions along fiber direction 120 GeV protons Dy = 23 mm Achim F. C.Woody, EIC Calorimeter Meeting, 4/17/14

  21. Energy Resolution 90° • ExpectedResolution: • Sampling: ~ 15% /√E • Photostatistics: ~ 7.5%/√E • Constant (nonuniformities) ~ 5% • Combined: ~ 17%/√E  5% 20° 10° Achim F. C.Woody, EIC Calorimeter Meeting, 4/17/14

  22. Further Corrections • Temperature variation • Better gain balance • Other non-uniformities ? • Light output • Light collection • Absorber stack • ??? C.Woody, EIC Calorimeter Meeting, 4/17/14

  23. HCAL Status and Test Beam Results E.Kistenev C.Woody, EIC Calorimeter Meeting, 4/17/14

  24. Calibration with Cosmic Rays E.Kistenev C.Woody, EIC Calorimeter Meeting, 4/17/14

  25. Raw Data Before Any Corrections E.Kistenev C.Woody, EIC Calorimeter Meeting, 4/17/14

  26. Energy Resolution Monte Carlo Simulation Test Beam Data Very Preliminary ! E.Kistenev C.Woody, EIC Calorimeter Meeting, 4/17/14

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