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Design of the TESLA very Forward Calorimeter

Design of the TESLA very Forward Calorimeter. K. Afanasiev 2 , V. Drugakov 2 , E. Kouznetsova 1 , W. Lohmann 1 , A. Stahl 1 1 DESY - Zeuthen 2 University of Minsk. DPG, Aachen, 10.03 – 13.03. 2003. Location and Requirements.

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Design of the TESLA very Forward Calorimeter

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  1. Design of the TESLA very Forward Calorimeter K. Afanasiev2, V. Drugakov2, E. Kouznetsova1, W. Lohmann1, A. Stahl1 1 DESY - Zeuthen 2 University of Minsk DPG, Aachen, 10.03 – 13.03. 2003

  2. Location and Requirements • Detection and measurement of electrons and photons at small angles • Fast beam diagnostic • Shielding of the inner part of the detector

  3. Beamstrahlung • TESLA : Beam size 553 nmx 5 nm • ↓ (pinch effect) • ~6 x 1010 photons / BX • ↓ (gg→e+e-, ge-→e+e-e- , e+e-→e+e- e+e-) • ~6 x 104 e+e- pairs / BX

  4. Background Simulation GUINEAPIG + BRAHMS ( for √s = 500 GeV ) : • Per bunch crossing : • ~15000 e± hit the LCAL • ~20 TeV of deposited energy • Expected dose : • for “bad” regions : • up to 10 MGy/year (R,f)-distribution of the deposited energy in LCAL : Deposited Energy, GeV

  5. High radiation resistance is required ! One of possible options for calorimeter technology • Diamond-tungsten sandwich • CVD DIAMOND radiation hardness No decrease in the charge collection distance up to 10 MGy www.desy.de/~ghodbane

  6. Tungsten absorber + Diamond sensor => Cell size = 0.5 cm RM ~ 1 cm • Sandwich LCAL geometry • Z - Segmentation : Tungsten 3.5 mm Layer = = 1 X0 Diamond 0.5 mm • (R,f) - Segmentation :

  7. sensor PA/discr ADC reconstruction • Signal and background • 250 GeV e- + BG : • Signal reconstruction • Algorithm : • 10 previous BG -> average BG + RMS • “Suspected” cells : ECELL > 3 sBG • reasonable z-location • Requirement of a longitudinal chain of such cells

  8. Sandwich LCAL recognition • Efficiency vs radius :

  9. Sandwich LCAL recognition • Fake rate : (BG of high energy + BG fluctuations) ( 500 bunchcrossings )

  10. Sandwich LCAL recognition • Energy resolution vs radius :

  11. Sandwich LCAL recognition • Energy resolution vs radius :

  12. Sandwich LCAL recognition • Polar angle resolution vs radius :

  13. Sandwich LCAL Recognition • Calibration : • Averaged energy resolution :

  14. Sandwich LCAL Recognition • Averaged angular resolution :

  15. CONCLUSIONS • sandwich diamond-tungsten calorimeter seems to be a promising technology • high energetic e±, g can be detected with reasonable efficiency even near the beam pipe, on top of the extremely high background • “hardware part” of the study has been started

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