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Design of the TESLA very Forward Calorimeter

This study presents the design of the TESLA Forward Calorimeter for detection and measurement of electrons and photons at small angles, with fast beam diagnostics and shielding. The use of a diamond-tungsten sandwich technology is explored for high radiation resistance. Simulation results and conclusions are provided.

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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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