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Rearrangement of the A4 Calorimeter for the Backward Angle Measurement

Rearrangement of the A4 Calorimeter for the Backward Angle Measurement. Outline. Rearrangement of the Experimental Setup Electron Tagging Counter Summary and Outlook. Rearrangement of the Experimental Setup. Calorimeter. Scattering Chamber. Target. Luminosity Monitors.

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Rearrangement of the A4 Calorimeter for the Backward Angle Measurement

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  1. Rearrangement of the A4 Calorimeter for the Backward Angle Measurement B. Gläser, PAVI06

  2. Outline • Rearrangement of the Experimental Setup • Electron Tagging Counter • Summary and Outlook B. Gläser, PAVI06

  3. Rearrangement of the Experimental Setup B. Gläser, PAVI06

  4. Calorimeter Scattering Chamber Target Luminosity Monitors Scattering Geometry under Forward and Backward Angles Scattering Chamber Elongation B. Gläser, PAVI06

  5. New Support Rotatable Calorimeter and Scattering Chamber Support Plane Steel Plate Hydraulic Oil Plunger B. Gläser, PAVI06

  6. New Rotatable Calorimeter B. Gläser, PAVI06

  7. Rearrangement Movie B. Gläser, PAVI06

  8. 255 MeV 315 MeV 570 MeV First Measurements at Backward Angles 225 MeV B. Gläser, PAVI06

  9. g e- Background Simulation Simulated Photon Background @ 315 MeV from p0 Decay B. Gläser, PAVI06

  10. Electron Tagging Counter B. Gläser, PAVI06

  11. Counter Geometry and Efficiency PbF2-Crystal … … e- e+,e- Additional Counter g Scattering Chamber Electron Beam Efficiency Demands on the Counter: Detection Efficiency Electrons -> 100% Detection Efficiency Photons -> 0% Elastic Rate @ 20µA (One Crystal): ~ 1,1 kHz B. Gläser, PAVI06

  12. Counts Pulse Charge / a.u. Cherenkov Counter vs. Scintillator Scintillator Pulse Height Spectra Cherenkov Pulse Height Spectra Counts Pulse Height / a.u. Detection Efficiency Electrons: Detection Efficiency Photons: Radiation Length Counter and Scattering Chamber: < 100% ~ 0% ~ (10,1 to 14)% X0 ~ 100% > 0% ~ 15% X0

  13. Counter Types • Diffusely Reflective Aerogel Cherenkov Counter • Gas Cherenkov Counter • Scintillation Counter B. Gläser, PAVI06

  14. Diffusely Reflective Aerogel Cherenkov Counter CalorimeterCrystals Housing Window for Photomultiplier Housing Aerogel ScatteringChamber Target Centerline Scattering Chamber Aerogel

  15. Gas Cherenkov Counter GasCherenkov AerogelCherenkov Filling: Refractive Index: Expected Photelectrons: Isobutane 1,0019 ~4 Aerogel (High Transparent) 1,05 ~5 B. Gläser, PAVI06

  16. Scintillation Detector Plastic Scintillator (EJ-204) Photomultiplier Housing (XP2262B) Scintillator Dimension : 20 mm x 50 mm x 400mm B. Gläser, PAVI06

  17. Energy Spectra @ 315MeV with the Tested Counters Aerogel Gas Scintillator Counts ADC-Channel ADC-Channel ADC-Channel Elastic Efficiency: ~68% ~46% ~81% Covered PbF2-Crystals: 28 28 14 Expected Elastic Rate: ~30kHz ~30kHz ~15kHz Measured Total Rate: ~2Mhz ~800kHz ~3Mhz

  18. The New Scintillation Counter Scintillator Photomultiplier Base Scintillator: Plastic Scintillator EJ-204 from Eljen Technology Photomultiplier: A Standard Fast, 12-Stage, 51mm Tube XP2262B Base: Full Active Base, our Design B. Gläser, PAVI06

  19. Final Design Double Ring with 72 Scintillator Modules. Each Module Covers 14 PbF2 -Detectors

  20. Final Calorimeter Design B. Gläser, PAVI06

  21. Histogramm Unit MEDUSA Pola-Bit data signal processing Memory pol0 pol1 PbF2 PM trigger Scintillator pol0* pol1* unused Adress bit PM CFD progr. Delay 20 ns Counts Delay / ns Electronic Setup Typical Rate Scintillator: ~ 1MHz Accidential Coincidence: 1% - 4%

  22. PRELIMINARY Actual Energy Spectra @ 315 MeV Counts Counts / 103 Counts ADC-Channel Elastic Efficiency : ~90% ADC-Channel B. Gläser, PAVI06

  23. Summary and Outlook • Rearrangement of the Calorimeter Setup • Electron Tagging Counters Tested • New Scintillation Counter • Measurements at Backward Angles • Measurements with Deuterium B. Gläser, PAVI06

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