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Towards HBD Proposal Ongoing activities and plans for the next two months

Towards HBD Proposal Ongoing activities and plans for the next two months. Itzhak Tserruya HBD meeting at BNL, September 15, 2004. HBD Proposal: (I) Layout. 1. Physics motivation and background (Axel) - importance and significance of low-mass dileptons

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Towards HBD Proposal Ongoing activities and plans for the next two months

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  1. Towards HBD Proposal • Ongoing activities and plans for the next two months Itzhak Tserruya HBD meeting at BNL, September 15, 2004

  2. HBD Proposal: (I) Layout 1. Physics motivation and background (Axel) - importance and significance of low-mass dileptons - summary of results at lower energies - expectations at RHIC - combinatorial background in PHENIX baseline detector and role of HBD 2. Ideal Monte Carlo simulations, system specifications (Summary of TN391) (Zeev) 3. Detector concept (Itzhak) 4. R&D results (Itzhak and Zeev ) - GEM gain in pure CF4 - Hadron blindness: * Photo-electron efficiency: - Gain saturation * Pion rejection factor: KEK results - Discharge probability - CsI quantum efficiency - Ion backflow - UV transparency of CF4 - Operation wih CsI photocathode - Absorption in H2O and O2 (Babak) - Tests in PHENIX environment (Craig) - Aging studies 5. Monte Carlo simulations and system performance (Ilia) 6. Electronics (Craig) - analog (Craig) - digital (Chi) 7. Trigger (David, Matthias) 8. Detector design and construction procedure (Itzhak) 9. Gas system (Craig) 10. Detector assembly and test facility (Sasha) 11. Estimated cost, Responsibilities and Time Table (Craig, Itzhak)

  3. HBD Proposal: (II) Logistics 1. Write all text in latex 2. Web page: https://www.phenix.bnl.gov/WWW/p/draft/fraenkel 3. Timetable • All material in place by 1st week of October. • Release to the Collaboration in October Core Week?

  4. Ongoing Activities 1. Large GEM test 2. Full size prototype 3. Monte Carlo (see Ilia’s presentation)

  5. Large GEM Test • 12 Large GEMs in house • 8 standard + 4 Au plated • active area 228 x 237 mm2 • high voltage segmentation on top and bottom faces • 15 Frames with spacer in house • PCB with hexagonal pads ready • Stretching and gluing devices ready • Stainless steel box ready and vacuum tested • Extension to CsI evaporator under construction

  6. 12 Large GEMs in house: • 8 standard + 4 Au plated • active area 228 x 237 mm2 • HV segmentation on both faces Kapton > ~400 mm Holes: 140 um pitch 80/60 um diameter 19mm 3mm Gaps between segments: As for COMPASS 3mm Bottom segment, 5mm Exact segmentation scheme for the bottom side: 1 segment of 7.5mm +45 segments of 5mm + 1 segment of 4.5mm Bottom segments are Staggered by 2.5mm with respect to the top segments 241mm 237mm 241mm Operational area (holes), 228mm 4mm for SMD resistors Copper coated area, 232mm GEM design- Bottom side (not to scale)

  7. Kapton > ~400 mm Holes: 140 um pitch 80/60 um diameter 19mm 3mm 3mm Top segment, 5mm Exact segmentation scheme for the top side: 46 segments of 5mm + 1 segment of 7mm Gaps between segments: As for COMPASS 241mm 237mm 241mm Operational area (holes), 228mm 4mm for SMD resistors Copper coated area, 232mm GEM design - Top side (not to scale)

  8. Material G10 Thickness 1.5mm Width 5mm 240mm + + 5mm 249mm 2.5 + + 2.5 4 holes D2.5mm Thickness 0.3 mm G10 Frame • Very fragile but needed to limit the dead area • Estimated dead area for a 5mm wide frame is 6%.

  9. Stretching Device The electrostatic pressure between GEMs: 0.5 N/m2 Limit the sagitta to 100μ  Need a tension of app. 40 N/m

  10. Gluing Device Glue dispenser: 100μ thick layer 4mm width

  11. Full-size prototype 1. Box design finished 2. Working on the design of tooling and jigs 3. All raw materials ordered and most of them already in house. 4. The plan is to construct a full size box and to equip it with one detector element only. 5. Once tested, the box will be shipped to BNL. Expected to happen by the end of the year.

  12. Plans for the next 2-3 months 1. Large GEM test : Sept-Oct 2. Full size prototype: Oct-Nov 3. Monte Carlo: Sept –Oct. 4. Conferences • CAARI, October 10.15, Texas Bob • IEEE, October 16-22, Rome, Craig

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