SVT Module design F.Bosi 22.7.2011

SVT L1-L5 Module design First attempt to model L1-L5 SVT modules starting from BaBar design: same radial position for all layers used same width of BaBar sensors/modules to keep the same the transversal (r-phi) section (# of modules, overlap…) modified the length (z) of the modules to extend the coverage down to 300 mrad. For arch modules barrel length extended, while wedge sensors are kept identical to the BaBar ones, with the same angle w.r.t the barrel as in the BaBar forward modules. Some good news (layers 4-5) Some bad news (layers1-2)

BaBar SVT lateral section

Layer 1

Layer 1

Layer 1

Layer 2

Layer 2

Layer 2

Layer 3

Layer 3

Layer 3

Layer 4B

Layer 4 A-B

Layer 5 A-B 300 mrad cone Services space 20 mm

General layout – side view

General side section

Shielding layout

SVT and Transition Card

SVT side section

SVT plan-section

SVT dimensions in Fastsim – N. Neri

L1-L5 barrel modules dimensions Layer Coverage 300 mrad Radius cm modules Module width from BaBar (cm) Barrel module length - Fastsim Neri (cm) Barrel modules length - Bosi new design (preliminary) (cm) 1 0.3 3.3 6 4.13 21.466 21.478 2 4 4.94 25.992 26.278 3 5.9 7.15 38.276 38.57 4a 12 16 5.28 44.57 45.795 4b 12.4 47.942 5a 14 18 61.81 61.304 5b 14.4 63.584

L1-L5 full modules length Module length - Fastsim Neri (cm) (barrel + 2 wedges) modules length - Bosi new design (preliminary) (cm) (barrel + 2 wedges) Modules lehgth without arch shape cm Layer 4a 58.164 59.389 77.585 Layer 4b 58.164 61.536 80.172 Layer 5a 75.404 74.898 90.516 Layer 5b 75.404 77.178 93.103