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Commissioning Configuration Mark D. Baker (+ Park +Olszewski+Katzy +Wozniak + …)

Commissioning Configuration Mark D. Baker (+ Park +Olszewski+Katzy +Wozniak + …). Purpose of Comm. Run Decisions for Comm. Run Quality of Full vs CR config. Open Issues More general year-1 issues. Overview. 1/2 of 1 Vertex Detector (+Y, +Z) Choose (+Y, +Z ),

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Commissioning Configuration Mark D. Baker (+ Park +Olszewski+Katzy +Wozniak + …)

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  1. Commissioning ConfigurationMark D. Baker (+ Park +Olszewski+Katzy +Wozniak + …) • Purpose of Comm. Run • Decisions for Comm. Run • Quality of Full vs CR config. • Open Issues • More general year-1 issues Commissioning Run Mark D. Baker

  2. Overview • 1/2 of 1 Vertex Detector (+Y, +Z) • Choose (+Y, +Z), • It will work. 1 (or 2) full detectors better. • 1/8 Octagon: arbitrarily choose: MOF* • It will work. Full octagon+rings better. • Do we want a sensor lined up with the spect.? • Spectrometer: Planes A-E (+partial G??) • A-D necessary, E (or F) exists • Year 1: Block Spectrometer for a period? Commissioning Run Mark D. Baker

  3. Proposed Vertex Detector VTB2 VTB3 VTB6 VTB7 VTA2 VTA3 Commissioning Run Mark D. Baker

  4. 1/2 Vertex works for Z=0->12cm 1 Full VTX Detector Half VTX Detector (cm) 18 16 14 12 10 8 Commissioning Run Mark D. Baker

  5. Eta coverage of Spectrometer vs. Z h Zvtx Commissioning Run Mark D. Baker

  6. Eta coverage of Spect. & VTX. h +Z VTX -Z VTX Zvtx Commissioning Run Mark D. Baker

  7. Proposed Octagon Configuration VT** P*** MOF* Commissioning Run Mark D. Baker

  8. Multiplicity Simulation Full Octagon + Rings +VTX Commissioning Config. Rec. Nch Rec. Nch N>3000 (20%) D=0.2% s=2% N>3000 (20%) D=-0.7% s=4.5% True Nch for |h<5.3| True Nch for |h<3.2| HIJING Inclusive sample, ZVTX=0 Commissioning Run Mark D. Baker

  9. Event-by-event Full Octagon + Rings +VTX Commissioning Config. HIJING+PL Central event, ZVTX=0 Commissioning Run Mark D. Baker

  10. Proposed Spectrometer Config. BDF exist AC can be built from spares. BuildAC! Commissioning Run Mark D. Baker

  11. Spectrometer • All attempts to find BDF-only tracks in high-multiplicity ER and MC events have failed! • The various successful spectrometer MC results assume perfectABCD or more. • Track finding • 3D Vertex Finding • F plane provides redundancy. It exists! Commissioning Run Mark D. Baker

  12. A Central event in PHOBOS Commissioning Run Mark D. Baker

  13. Perfect ABCD w/ VTX Rec. Ghosts @ 2% level True Commissioning Run Mark D. Baker

  14. Perfect ABCD w/o VTX Rec. True Commissioning Run Mark D. Baker

  15. B-D-F Real data - Eng. Run • BDF no VTX in MC (min. bias): • Efficiency drops to ~50%, Ghosts increase to ~30% Commissioning Run Mark D. Baker

  16. Conclusion • VTA2-3, VTB2-3, VTB6-7 • MOF* • P-arm planes: A, B, C, D, F • Build 2 more spare type 1 planes • Open questions, under active study: • Install MOA7 now? (Judith+Inkyu) • Install MOE6-8 for year 1? (Inkyu) Commissioning Run Mark D. Baker

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