1. November 5, 2003ACD Geometry Review

2. November 5, 2003ACD Geometry Review What has been updated? Tile dimensions and positions Ribbons Support structure THANK YOU JOANNE!!!!

3. November 5, 2003ACD Geometry Review Communicating The ACD engineering team maintains its database of geometry parameters in SFX files – readable using a program called SolidView. SolidView Lite is FREE –http://www.solidview.com/

4. November 5, 2003ACD Geometry Review Actual ACD Tile Mass ACD Mass 7-21-2003 RevA1 Top Tile Total: 30641g Side Tile Total: 58432g

5. November 5, 2003ACD Geometry Review Top Tiles

6. November 5, 2003ACD Geometry Review Simulated Mass Top Tiles http://www.slac.stanford.edu/exp/glast/ground/software/geometry/data/RELEASED/materialsSummary.html topTileRcentCcent 1370 1 Polystyrene1414 topTileRcentCedge 1178 22357Polystyrene2432 topTileRcentCmid 1142 22284Polystyrene2357 topTileRdefCcent 1360 45443Polystyrene5617 topTileRdefCedge 1170 89362Polystyrene9662 topTileRdefCmid 1134 89072Polystyrene9362 NameVol (cu cm) Convex Vol # Phys Total Vol MaterialMass (grams) Simulated Total: 30844gTop Tile Total: 30641g

7. November 5, 2003ACD Geometry Review Side Tiles

8. November 5, 2003ACD Geometry Review Side tiles

9. November 5, 2003ACD Geometry Review Simulated Mass: Side Tiles NameVol (cu cm) Convex Vol # Phys Total Vol MaterialMass (grams) sideTileR0EdgeGreater1255 45021Polystyrene5181 sideTileR0EdgeLesser1206 44826Polystyrene4980 sideTileR0Mid1215 1214581Polystyrene15048 sideTileR1EdgeGreater684 42736Polystyrene2823 sideTileR1EdgeLesser657 42630Polystyrene2714 sideTileR1Mid662 127946Polystyrene8200 Row 0 Total: 25209g Actual Total: 23744g (Row 4 in engineering spreadsheet?) Row 1 Total: 13737g Actual Total: 13940g

10. November 5, 2003ACD Geometry Review Simulated Mass: Side Tiles sideTileR2EdgeGreater514 42057Polystyrene2123 sideTileR2EdgeLesser494 41978Polystyrene2041 sideTileR2Mid498 125976Polystyrene6167 sideTileR32269 49077Polystyrene9367 NameVol (cu cm) Convex Vol # Phys Total Vol MaterialMass (grams) Row 2 Total: 10331g Actual Total: 10632g Row 3 Total: 9367g Actual Total: 10116g

11. November 5, 2003ACD Geometry Review Gaps The gaps between top tiles is 2 mm Top Tiles ribbon gap The gaps between top tiles is 2 mm

12. November 5, 2003ACD Geometry Review More on Gaps Top Tile Side Tiles ~4.2 mm gap ~2.8 mm gap

13. November 5, 2003ACD Geometry Review And a little more Side Tiles Gap

14. November 5, 2003ACD Geometry Review ACD Engineering Mass: Ribbons sideRibbon52 16845Polystyrene872yRibbonTopCent26 4104Polystyrene108 yRibbonTopEdge23 8187Polystyrene193 yRibbonTopMid23 8189Polystyrene195 xRibbonTop116 4465Polystyrene480 1848g 1531.9g Simulated

15. November 5, 2003ACD Geometry Review Ribbons

16. November 5, 2003ACD Geometry Review Ribbons are now active detectors Test runs using 2 GeV muons shot into the top and sides

17. November 5, 2003ACD Geometry Review Support Structure

18. November 5, 2003ACD Geometry Review Support Structure Support structure appears here in red. Model includes the core and the 2 face sheets.

19. November 5, 2003ACD Geometry Review Support Structure Mass ACD Mass 7-21-2003 RevA1 Simulated: 13238g Side core and facesheet Total: ? g Top core and facesheet total: 10529.2g Simulated: 10381g

20. November 5, 2003ACD Geometry Review Top CsI crystal, Z position of front (top): -48.12 mm Questions have been raised concerning the position of the bottom most ACD side tile relative to the top face of the top CsI crystal.

21. November 5, 2003ACD Geometry Review Bottom of bottom ACD tile: -48.21 mm

22. November 5, 2003ACD Geometry Review Another look in the Gleam GUI Bottom of bottom ACD tile CsI Crystal Distance between top of CsI crystal and bottom of ACD side tile < 0.1 mm

23. November 5, 2003ACD Geometry Review Z-position of bottom of ACD support structure: 655.57 mm

24. November 5, 2003ACD Geometry Review Z position of the top of the Tkr Wall: 631.97 mm Distance between top ACD support structure and top of Tkr wall: 23.6 mm

25. November 5, 2003ACD Geometry Review TKR and ACD on Sides Approx 19.2 mm between TKR and Support Acd Support Structure TKR Wall

26. November 5, 2003ACD Geometry Review Thermal Blanket Still working with the original model of the blanket from PDR. 1 Layer of magic material Need updated information

27. November 5, 2003ACD Geometry Review To Do BEA (Base Electronics Assembly) Account for mass of cables, electronics, and ancillary structures Thermal Blanket

28. November 5, 2003ACD Geometry Review Questions Mass spreadsheet under Shell for the sides, I want to make sure I am interpreting the numbers there correctly. For example, the Long Side shell - there is a line highlighted that says: "Side Panel Subtotal (Total for 2)" with a mass without margin of 6.99 kg. So that is the total mass of the side shell for 2 sides of the ACD? b.) How far is the ACD from the TKR walls on the sides and top?

29. November 5, 2003ACD Geometry Review Questions contd. Review the overlap of the bottom ACD tiles and the topmost CsI crystal. Information concerning the thermal blanket would be helpful - we are still working from initial estimates used back for the PDR.