Pixel Stave Prototype Development Samples of thermally conducting

Pixel Stave Prototype Development • Samples of thermally conducting foam obtained from Allcomp, Inc – 0. 18 g/cc as delivered – Thermal conductivity not measured (yet) • Small prototype (20 cm long and about 2. 4 cm wide) made – see photos on next pages – Small aluminum tube(2. 8 mm OD and 2. 2 mm ID) used to simulate about what might be used for CO 2 at SLHC – Foam machined (easy) to shape and with groove for tube – CGL 7018 used to couple tube to foam – Hysol 9396 loaded with Boron Nitride (30% by weight) used to couple facings to foam • One facing is YSH 70 cloth, 165 microns thick • Second facing is K 13 D 2 U 4 -ly laminate 300 microns thick (90 -0 -0 -90 orientation) M. Gilchriese

Pixel Stave Prototype - I Foam with groove for tube. Three pieces joined. One side K 13 D 2 U laminate YSH-70 cloth Foam with groove for tube. Three pieces joined. One side M. Gilchriese

Pixel Stave Prototype - II Tube with CGL 7018 YSH-70 and K 13 D 2 U glued to foam Tube in foam with CGL 7018 M. Gilchriese

Pixel Stave Prototype - III • Final assembly(foam+fiber halves glued together around tube) • Heaters on YSH-70 side only for first measurements • Platinum-on-silicon heater in middle to simulate pixel module and copper-kapton heaters on either side to minimize end effects. 24 mm Foam 6. 9 mm M. Gilchriese

Thermal Performance • • IR camera used Water coolant at 1. 0 l/min at 20 C. Vary power level in silicon heater And separately in copper-kapton heaters to about match Power/Area T in boxes Label A 1 A 2 Emis 0. 95 BG 19. 0 Ave 27. 41 27. 36 SD 0. 65 0. 80 Max 28. 4 Min 25. 9 23. 8 Unit M. Gilchriese C C

Preliminary Thermal Performance Note if CO 2 used as coolant then reference temperature could be about -30 C. Thus delta T of 10 => T of -20 C. M. Gilchriese