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Pixels, placements and possibilities

Pixels, placements and possibilities. an historical view of the pixel telescope layout. The Proposal Setup. 6 small 4-chip planes 4 big planes with 8 di-chip assemblies. Objectives for this work. Define chips’ positions inside the 8-chip (big) planes

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Pixels, placements and possibilities

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  1. Pixels, placements and possibilities an historical view of the pixel telescope layout André David (CERN/CFIF-IST) – NA60 Coll. Meeting – April 14-15, 2003 - CERN

  2. The Proposal Setup • 6 small 4-chip planes • 4 big planes with 8 di-chip assemblies André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  3. Objectives for this work • Define chips’ positions inside the 8-chip (big) planes • Maximize geometrical coverage of muon for expected placement positions (20-36 cm) • Distribute the planes inside the telescope • Maximize physics performance, while • Guaranteeing technically feasibility André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  4. Chronology • March 2002 • 8-chip plane design • April – November 2002 • Telescope layout optimization from physics • December 2002 – April 2003 • Layout constraining from technical issues André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  5. The 8-chip plane design • Exploit offline cuts on muons passing • ACM Fe poles • Trigger inneficiency from “keyhole” on R3 • Inner hole adjusted to not lose muons at 26 cm • Done for both J/ and  decay muons André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  6. First setups • 6 small planes starting at 7.6 cm every 1.2 cm • x y x’ x y’ x’ • 4 big planes at 16, 26, 30 and 36 cm André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  7. First setups - continued • Put 2 back-to-back small planes at 16 cm • Add y plane • Put small “hole-filler” plane in front of 1st big plane André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  8. Interlude – Summer 2002 • The modules holding the chips started to shape up in June 2002 • This gave more information to constrain the placement of the planes in the telescope André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  9. Final Setups - Introduction • Last November there was a clear idea of the minimal distances we could have between planes • (ppix, A Anneau) André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  10. Final Setups – Performance criteria • Measured as percentage of “uncut” single muons • ACM iron poles, R3 keyhole and MWPC fiducial zone • Muons for “offsetting” require • 2x+1y hits on first 6 small planes, plus • 2X hits on big planes • Muons for “tracking” require • 2x+1y hits on first 9 small planes, plus • 2X hits on big planes • Only use J/ decay muons • Retracking each configuration takes ~2 hours 2x + 1y 2X 2x + 1y 2X André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  11. Final Setups – Set1 • Several assumptions used • Cut PCB components’ pins • Use LEMO for GLink connector • Back-to-back planes can really be put back-to-back • Offsetting – 81.6% • Tracking – 87.5% • Loss of muons in first and last small planes André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  12. Final Setups – Set2 • Moved small planes further downstream • Gain ~2.5% • Offsetting – 84.2% • Tracking – 88.3% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  13. Final Setups – Set3 • Put big planes further upstream • 22, 28 and 32 cm • Gain ~4% • Offsetting – 88.4% • Tracking – 92.9% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  14. Final Setups – Set4 • Put 2nd big plane in the middle of the other 2 • 21, 26.5, 32 cm • Gain ~1.5% • Offsetting – 89.7% • Tracking – 94.2% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  15. Final Setups – Set5 & 6 • Put hole filler in the middle of the first 2 big planes • Correct material thicknesses • No gain, but no loss • Offsetting – 89.7% • Tracking – 94.2% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  16. Final Setups - SPSC setup • Based on the last configuration • Removed some pixel planes • Replaced by strip planes • On CVS André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  17. Interlude – April 2003 • All mechanical pieces are in their final form • This includes • Support frame • Bus PCBs • Ceramic hybrids • Pilot readout card • Cooling ring and piping André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  18. Final Setups – Set7 • Final setup as far as technical aspects would be regarded • Not simulated because the last 2 small planes would be at 18 and 19.5 cm • Replaced by 1 big plane • Performance criterion redefinedSingle “Tracking” criterion • 2x+1y hits in the first 7 small planes • 1X in the first 2 big planes • 1X in the last 2 big planes 2x + 1y 1X 1X André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  19. Final Setups – Set8 • Replace last 2 small planes by 1 big plane • Big planes at • 18, 24, 27 and 32 cm • Performace • Tracking – 92.0% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  20. Final Setups – Set9 • Use smaller GLink connector • Shrink small planes distances • Gain ~0.5% • Tracking – 92.5% André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  21. The Final Setup • All final component and material thicknesses included • Composition of some materials used in the pixel hybrid still missing André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  22. The Final Setup - continued • Comparison with extracted single muon J/ acceptances • Small planes in blue, big planes in violet André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  23. Summary and outlook • Already one year of work in this problem • (to my surprise) • Final setup for Indium run available in the very short term • Minor modifications may be needed in the future to account for some materials • Will be in CVS within days André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

  24. Any questions ? André David – Pixels, placement and possibilities, NA60 Coll. Meeting, April 14-15, 2003 - CERN

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