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The Clean Tent at USB

evaporator. glove box. laminar flow hood. GEM storage vessel. The Clean Tent at USB. (“Class”: number of ≤0.5 μ m particles/m 3 ). “Class” of Clean Room. Entrance Foyer. READY FOR EVAPORATION. Preparation for Evaporation. Installation into Evaporation Box: GEMs mounted in evap box

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The Clean Tent at USB

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  1. evaporator glove box laminar flow hood GEM storage vessel The Clean Tent at USB (“Class”: number of ≤0.5 μm particles/m3) “Class” of Clean Room Entrance Foyer

  2. READY FOR EVAPORATION Preparation for Evaporation • Installation into Evaporation Box: • GEMs mounted in evap box • leads connected underneath • test-chicklets installed • Cleaning GEMs: • GEMs are “de-dusted” with Ar

  3. The Evaporator on loan from INFN Roma Magnetically coupled driver for moving the GEMs inside the vacuum. Quantum Efficiency Station Evaporation Chamber

  4. Railroad System“low rider” • Chuggin’ along on the railroad: • After flushing the foyer, • Transport box rolls effortlessly out of the airlock... • …and into the glovebox. • To reach over the edge and inside transport box, the “low rider” system was developed.

  5. The older unit with a mirror is better for next stage of R&D. • Larger rings will require some mods (or just capture a fraction of a ring. • OTHER EQUIPMENT: • High Purity High Flow recirc. Gas system. • Gas Chromatograph

  6. Questions to Simulation • Quick Calculation of Light Yields C6F14: • Quartz Window (l=170)…20 p.e./cm • MgF2 window (l=150)…65 p.e./cm • What are the limits on thickness of C6F14? • Can we presume that RICH is after tracking? • Also implies constraint on window. • How many sigma between pi/K/p separation at various wavelengths (sets ring radius resolution)? • Tolerable mirror thickness? • If electron direction uses “High Threshold”, what is the required threshold for e-pi separation? • Effects of multiple scattering, mirror surface roughness, mirror precision, mirror alignment, detector placement, …on RING RADIUS resolution.

  7. Backups…

  8. Harpoon for moving mounting box GEM mounting box w/ wheels on track GEM CsI The Evaporation Chamber Molybdenum boats • Boats are in series so they must be brought up to temperature slowly (~10 min) • 250 – 450 nm layer of CsI at rate of ~2 nm/sec • ~24 hrs to pump down vessel • vacuum ~10-7 mbar • no water!! • Evaporate 4 GEMs simultaneously AC

  9. GEM w/ CsI e- ampmeter e- ~ 100 V ~ 2mm mesh (e- collection) D2 lamp (λ=160,185,200 nm) γ mirror reference PMT The Quantum Efficiency Station Harpoon for moving mounting box GEM mounting box w/ wheels on track GEM with CsI Molybinum boats AC

  10. Relative QE (results from the evaporator) • Encouraging results: • Highly uniform QE across GEMs.

  11. Absolute QE (results from BNL) 6 eV 10 eV • Encouraging results: • Highly uniform QE across GEMs. • Chicklet results confirm high QE.

  12. Transport Box Removal Moving the Transport Box: • Prep for transport to glovebox: • Evaporator back-filled with clean Ar. • Lid raised flush to transport box. • Evaporator gets opened. • Lid is secured on box.

  13. Transport Box Entry Into Glovebox …through the glovebox foyer…

  14. (a safe GEM is a happy GEM) Electric Lift System (1) • Where to store the lid of the transport box?? • Transport box lid is big and cumbersome. • Nowhere to set the lid down during GEM extraction. • …nowhere but UP, that is!!! • And, of course, • out of the transport box… • …and into the pizza box!

  15. Electric Lift System (2) • Where to store the lid of the gain box?? • Gain box lid is heavy. • Nowhere to set the lid during GEM insertion/extraction. • YEP!! You guessed it! …UP! • Patch Panel: • “Plug and Chug” • 56-pad gain map in 1 hour!!

  16. Gain Measurement Output • Maestro (PC-based MCA software) • Automated Gain Saturation: • One spectrum every 5 min. • Root macros to plot gain curve • Automated Gain Map: • Prompts user vocally to move cable to next signal. • New Patch Panel eliminates 50-ohm terminators. • Complete map (56 pads) in 1 hour.

  17. GEM-stack Installation • Glovebox is fully operational: • HBD Vessel sat in the left third of the glovebox. • All GEMs were successfully installed. • Both HBD halves were finished by the end of September. • Note: Rainbow-like CsI sheen on top GEM.

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