e+e- COLLIDER DETECTOR Revised 3/2001 - DESIGN L2

Component

 Radius (cm) Z (cm)

Technology

Performance
   Min Max Min Max    
Vertex Detectors (layer 1) 1.2   -2.5 2.5 CCD 4.5u+5.5 u /psin3/2
Vertex Detectors (layer 2-5) 2.4, 3.6, 4.8, 6   -12.5 12.5 CCD 4.5u+5.5 u /psin3/2
Intermediate Tracking 48   -30 30 Si strips  
Central Tracking 52 190 -270 270 TPC (delta)/P2~6x10-5 high p

(delta)P/P~0.4% low p
Forward Tracking 4.3

10.9

17.6

24.2

30.8

 48 +/- 30

+/- 90

+/- 150

+/- 210

+/- 270

  

 

 

 

 

 Si discs (delta)/P2~6x10-5 high p

(delta)P/P~0.4% low p

EM Calorimeter 

Barrel
End Cap
 
196
29
 
220
187
 
-322
297.5
 
322
321.5

Pb/Scintillator

(delta)E/E~ 12%/(root) E +1%

Hadron Calorimeter
Barrel
End Cap
 
233
31
 
365
221
 
-466
334
 
466
466
Pb/Scintillator (delta)E/E~50%/(root)E +2%
Coil Magnet 395 424 -395 395 SC Solenoid

~1/2 (lambda) thick

 3 Tesla

Muon Detector
Barrel
End Cap
 
453
25
 
645
642
 
-477
477
 
477
669
Fe/gas  
Luminosity Monitor 5 18 300 325    
Vertex Dector

    5 layers of CCD's                    

           radius   layer     1                1.2cm,   5 cm long

                                      2                2.4 cm,  25 cm long

                                      3                3.6 cm,  25 cm long

                                      4                4.8 cm,  25 cm long

                                      5                6 cm,  25 cm long

Central Tracker

           TPC - assume 144 points on a track (active region 52-190 cm)

                           point accuracy 140u

                           gas thickness 0.01  Xo

Calorimeter - Pb/scintillator  

           EM sections                 40 layers        4 mm  Pb

                                                                          1 mm Scint.

           H section                     120 layers        8 mm  Pb

                                                                          2mm Scint.

        Pb:         xo  = 0.56 cm  (lambda) = 17 cm

        EM       40 x 4 = 160 mm   => 28 xo

        Total   40 x .4 + 120 x .8 = 16 + 96 = 112 cm  =>  6.6(lambda)

        Total thickness

                    EM         40 x 0.5 = 20 cm

                    Had         120 x 1 = 120 cm

        (Silicon pads      1 cm  x  1 cm after 6th  layer of EM) *not implemented in the code*

        Segmentation     EM        .04 x     .04  (i.e., 40 mr x 40 mr)

                                    Had         .08 x .08

Muon detector   

       24  iron plates 5 cm thick each

                    3 cm gaps between plates

                    use RPC detectors

                    pads continuing tower structure of Hadron calorimeter

        Position resolution for muon tracking:

                    3 cm wide strips give sigmar (theta)  ~1 cm in (theta) in each of the 24 gapes

                    every sixth layer to have 3 cm transverse strips to provide sigmaz ~ 1 cm

Last Modified: 01/13/04 12:40