1. C. Haber / M. Gilchriese Integrated Stave Electrical/Mechanics/Cooling Update February 6, 2008

2. C. Haber / M. Gilchriese 2 6 x 3 cm, 6 chips wide 10 x 10 cm, 10 chips wide 1 meter, 3 cm strip, 30 segments/side 192 Watts (ABCD chip), ~2.4 % Xo + support structure 1 meter, 2.5 cm strip, 40 segments/side 200-250 Watts (@0.25 W/chip) ~1.9 – 2.2 % Xo + support Stave-07 Stave-06 60 cm, 9 cm strip, 6 segments/side Stave-08 Prototypes and Designs Build and test Study

3. C. Haber / M. Gilchriese 3 Issues From Valencia Progress on testing and fabrication of Stave-07 Irradiation of hybrids glued directly on silicon surface Thermal performance of bridged hybrid Planning for Spring 2008 module review

4. C. Haber / M. Gilchriese 4 Progress on Testing/Fab of Stave-07 Have operated 5 hybrids in a serial chain with good performance Have built and are studying 3 modules with hybrid on the silicon and 1 “reference” module with hybrid off the silicon Effort on gluing and alignment procedures implicit in module building Bus cable has been submitted for fabrication, due in 1-2 weeks –Extra clock lines have been added to allow options for clock distribution included 1 clock for 30 module or 1 clock for 10 modules

5. C. Haber / M. Gilchriese 5 Module Assembly and Test Fixture  volve a  single fixture for assembly, bonding, inspection, and test.

6. C. Haber / M. Gilchriese 6 Bus Cable Serial current link Serial current return HV distribution Clock & Command lines Data Readout 1/hybrid

7. C. Haber / M. Gilchriese 7 Irradiation plans Irradiations are in planning phase both at BNL and LBNL BNL is looking at Boston and Los Alamos sites LBNL would use on-site 55 MeV protons Hope to have first runs in the next few months

8. C. Haber / M. Gilchriese 8 FEA Models of Bridged Hybrid - I Since the Valencia meeting we have completed FEA analysis of basic thermal performance with bridged hybrid Multiple models to achieve reliability and understanding ¼ simple model, similar to ANSYS model by others, air treated as “solid” under bridge ½ model with air box to allow for 3D air effects (not just under bridge), no air flow Air gap ¼ model Air box for 1/2 ½ model

9. C. Haber / M. Gilchriese 9 FEA Models of Bridged Hybrid -II Multi-hybrid model Multi-hybrid model, with air flow included(so far 0.01 m/sec) For simplicity, all studies so far done with tube wall temperature fixed at -28C, 0.25 W/IC and no detector heating. Goal is to compare first with glued hybrid under same conditions More details are here and herehere

10. C. Haber / M. Gilchriese 10 Short Summary Good agreement among models Modest effect of gas flow Reduced K means lower than nominal K in structure. No optimization of structure yet For comparison, nominal design (hybrids glued on silicon) for comparable assumptions yields max sensor temperature of about -22.5C ModelIC Peak Temp(C) Bridge Gradient(C) Sensor T Max(C) ¼ model-5.86.6-20 ½ model-6.36.8-20.2 With air flow -15C gas -5.97.6-18.7 ¼ model Reduced K 3.45-16.7