1. CDC structure
Shoji Uno (KEK)　　　
July-8, 2009

2. Baseline Design
sBelle
Belle
MAPS = Monolithic Active Pixel Sensor 2

3. Tentative drawing by Kohriki-san

4. Connection regions 1 Endplate and Outer cylinder
Main and Conical (Backward)

5. Connection regions 2
Main and Conical (Forward)
Backward
Forward

6. Connection regions 3 Conical and Small cell
Small cell and Inner cylinder

7. Main parameters Present Future 77 160 880 1096 88 168 863 1082 50 58
Radius of inner boundary (mm) 77
160
Radius of outer boundary (mm)
880
1096
Radius of inner most sense wire (mm) 88
168
Radius of outer most sense wire (mm)
863
1082
Number of layers 50 58
Number of total sense wires
8400
15104
Effective radius of dE/dx measurement (mm)
752
928
Gas
He-C2H6
Diameter of sense wire (mm) 30

8. Calculation of deformation and etc
Deformation of Aluminum endplate
Thickness of endplate 　10mm
Tension of field wire 　120g  80g
Gravitational sag, Sense : 190mm(50g), Field:300mm(80g)
Unequal sag  Nane-san’s talk
Total tension ~4ton
Deformation  Yamaoka-san’s talk 　 　　　
Stress calculation
Thickness of outer cylinder　CFRP：mm　
Transition structure between endplate and outer cylinder
Bucking calculation for inner cylinder
Larger tension for many wires ( ~400kg)
Yamaoka-san’s talk

9. Weight Endplate Outer Cylinder Electronics Board Al, Thickness : 10mm
110kgx2 = 220kg
Outer Cylinder
CRRP, Thickness : 5mm
210kg
Electronics Board
G10, 48ch/board
0.3kgx315 = 95kg

10. Wire configuration So far, But, 48ch/board 16X3
8(A),6(U),6(A),6(V),6(A),6(U),6(A),6(V),8(A),
58 layers in total
But,
Readout board 64ch/board 16x4  No good assignment
48ch/board 16X3
8(A)  2(A)+6(A) inner most super layer
2(A)  special treatment 160x2=320 : 48x7=336
8(A)  6(A) outer most super layer
56 layers in total  Good assignment
Other good idea is highly welcome.

11. Readout board space Test board 16ch  48ch(~300boards in total) 17.5cm
Should be fit in volume
20cm

12. My Personal Plan for Construction