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VTX

VTX. PHENIX Central Region. Planar GEM tracking chambers. From VTX Proposal (dims in mm). HBD is standalone. Engineering for VTX. Core design group assembled PHENIX hired D. Lynch (to replace retiring P. Kroon) Work on PHENIX central region, which includes VTX

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VTX

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  1. VTX

  2. PHENIX Central Region Planar GEM tracking chambers From VTX Proposal (dims in mm) HBD is standalone

  3. Engineering for VTX • Core design group assembled • PHENIX hired D. Lynch (to replace retiring P. Kroon) • Work on PHENIX central region, which includes VTX • Engineering specific to VTX will be done at LANL by W. Sondheim & J. Boissevain • In consultation with new PHENIX engineer • Point of contact with HYTEC • D. Lee & R. Pak to provide oversight • 1st meeting was yesterday to lay out scope of project

  4. Current Concept for VTX

  5. Refined Concept: e.g., VTX Endcap

  6. Si VTX Spec Sheet Soon to appear on the web

  7. ~$135k ~$135k 30 Be Beam Pipe Quote Save up to 20% on Be portion for combined order with STAR

  8. Mylar Sleeve • Proper grounding & isolation of Si detector • Image charge from circulating beam • Aluminized Mylar sleeve around Be beam pipe • Few mm’s thick to hold down material budget • Grounded w/ braid through magnet • No interference with other sub-systems; nothing else between beam pipe and 1st pixel layer • General agreement this is OK

  9. VTX Mechanical Support Structure • Frame for barrel & endcaps (HYTEC and LANL) • External support structure in central magnet (BNL) • Mechanical tolerances/distortions: • < 25 mm internally (invited by CMS to Fermi Lab) • 100 mm relative to the rest of the detector • From CAD Survey Group (F. Karl): • 50 – 100 mm on the bench • 100 – 200 mm in the hall

  10. VTX Mech Support Structure (cont) • Modular design is necessary: • Easily removable from IR • Staged approach: • Pixels, strips and endcaps mount separately • Mounted off of pole tips/nose cone calorimeter • To maintain specified tolerances • Alternate scheme proposed at Vanderbilt Meeting

  11. Alternate Mounting Scheme From: van Hecke TPC mounts from top CM yoke. VTX Si detector comes in from bottom, much like MVD does now. Translate or clamshell?

  12. VTX Auxiliary Systems • Services routed radially at the pole tips: • Power for Si detectors (proper grounding & isolation): • Si HV & LV power supplies (Stony Brook & RIKEN) • UPS (BNL) • Cooling system for Si • Operating temperature: < 10o C (Junkichi study) • Dry Air System • Bleed boil off from LN2 buggy into enclosure • Radiation Monitoring • TLDs & Chipmunks

  13. Routing for Services From: van Hecke Power, cooling and signal services are brought in at both ends, using the entire perimeter.

  14. Spec Sheet Revisited More from Hiroaki and Atsushi later in this meeting

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