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					        TAU activities in
     EUDET – JRA3 (VFCAL)

                                           detector
                        Halina Abramowicz
                         Tel Aviv University
                          HEP Experimental Group



Collaboration
High precision design             1                EUDET-JRA3
                        Position requirements




Collaboration
High precision design            2              EUDET-JRA3
                                 Pad Design
       15 cylinders( ) * 24 sectors( )* 30 rings (z )= 10800 cells

  8 cm
                                  0.34 cm    0.31 cm
                                                           X0=0.65 cm
                                  Tungsten   Silicon
   28 cm                                                   R M =1.1 cm


                                                          Cell Size
                                                       1.3 cm * 2 cm >
                        6.10 m           R             1.3 cm * 6 cm <
       L
                                                       ~1 Radiation Length
                                                       ~1 Moliere Radius


Collaboration
High precision design                3                     EUDET-JRA3
                              Resolutions
                        Cuts: acceptance and back-to-back




Collaboration
High precision design                  4                    EUDET-JRA3
                           Strip design
                                     Every other ring:




                                     64 cylinders ( )
                                     120 sectors ( )
                                     30 rings (z )




Bogdan Pawlik,
INS PAS Cracow                              L            R

   Collaboration
   High precision design        5               EUDET-JRA3
                            Event selection
    Selection: E(e+), E(e-), θ(e+), θ(e-) as generated
    E(e+) > 0.8 Ebeam , E(e-) > 0.8 Ebeam
    30 < θ(e+) or θ(e-) < 75 mrad        (never both, alternate e+, e-)
     reduces sensitivity to the IP position




             electron energy (GeV)                             Min. energy cut (GeV)

   E (e , e )  0.8Ebeam  Eff  82,52%
   E                   L
       104               0.7 104
    E                    L
Collaboration
High precision design                         6                            EUDET-JRA3
                              Event selection
                                                                     5 deg         103 rad
     Eout-Ein                              Out
P=   Eout+Ein


                             In

                                  3 cylinders




                                                    Left side PH
                                  2 cylinders
                                  1 cylinders                                         All events
                                                                                      After acceptance and
                                                                                      back-to-back selection


                                 (rad )
                                                                           Right side PH

                        0.4 103 rad
                                                                   L / L  5 104
                       (  )  10%
      Collaboration
     High precision design                      7                                  EUDET-JRA3
   How well do we have to know the
      detector performance ?




Collaboration
High precision design   8   EUDET-JRA3
                         Selection procedure

Study of selection rules:
1. Energy cut on both leptons + fiducial volume cut
   on one lepton        high requirement on energy
   calibration.
2. Containment requirement on both leptons + back to
   back topology       high requirement on angular
   resolution.

 Need to study these issues, and include backgrounds

  Collaboration
 High precision design          9           EUDET-JRA3
 Performance of present configurations
            Parameter           Pad Performance    Strip Performance

         Energy resolution           25% ( GeV )          8:16%( GeV )


                  resolution    3.5 * 10-5 rad      2.1 * 10-5 rad


                  resolution       10-2 rad             10-3 rad


                              ~ 1.5 * 10-6 rad    ~2.1* 10-7 rad

     Electronics channels           25,200          3720 (with bonding sectors)
                                                     13,320 (without bonding)

                        Need to decide on one of the
                         options (feasibility driven)
Collaboration
High precision design                 10                       EUDET-JRA3
                  Infrastructure development

1. Present lab testing TGC modules for ATLAS – free
   in about one year.
2. Build clean room.
3. Acquire silicon sensor (David Strom – Oregon U.)
4. Start building a testing stand for learning purposes.




Collaboration
High precision design        11              EUDET-JRA3
                            Summary
1. Simulation of LumiCal performance
   - implement GEANT4
   - GRID implementation
   - background studies
2. Develop lab for sensor testing
                                                 TAU - LumiCal
   - learn how to work with silicon sensors
                                                 Halina Abramowicz
   - participate in the construction and tests   Ronen Ingbir
     of LumiCal prototype                        Sergey Kananov
                                                 Aharon Levy
                                                 Iftach Sade

  Collaboration
  High precision design           12             EUDET-JRA3