PHENIX Central Region

2. PHENIX Central Region HBD VTX Integrate Detector Upgrades From VTX Proposal (dims in mm)

3. HYTEC Structural Results • GFRP sandwich composite M55J for the base structure • substantial gain in the stiffness to weight ratio • similar rad length and strength • most widely used standard • Outer frame structure should be single diameter • Structural end disks to prevent deformation of the structure under dynamic load inputs

4. HYTEC Cooling Results • Use ladder, or stave, concept supported at its ends by composite rings • Stave structure comprises a C-C thermal plane • OMEGA shaped composite bonded to back of thermal plane adds stiffness • Cooling tube bonded to the back of the C-C thermal plane with C-C tube support • Use Al cooling tubes 3mm in diameter supplied with a 23 g/s single-phase perfluorocarbon fluid, C5F12

5. VTX Spec Sheet For next round with HYTEC • Already consider barrel and endcaps • aid to visualizing integration • streamline engineering

6. Mechanical Engineering for VTX • Core design group assembled • PHENIX BNL Engineer D. Lynch: • Work on PHENIX central region, which includes VTX • Engineering specific to VTX being done at LANL by W. Sondheim & J. Boissevain • In consultation with PHENIX BNL engineer (off project) • Point of contact with HYTEC • D. Lee & R. Pak to provide oversight

7. Pretty Picture From J. Boissevain

8. w/ the Endcaps

9. Be Beam Pipe • Desirable to get as close as possible to collision vertex w/o adding considerable radiation length • In discussion w/: • PHENIX BNL Engineer (P. Kroon) • 0.3 +/- 0.1cm clearance between beam pipe and 1st Si layer to get VTX concentric with the beam • CAD Head of Vacuum Group (D. Hseuh) • 3cm diameter probably OK • Require NEG coating • AP Upgrades Coordinator (W. Fischer) • Physical aperture of at least 5 transverse rms beam sizes (allowing for 5mm orbit error) is OK

10. Off project Be Beam Pipe Quote

11. 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

12. VTX Mechanical Support Structure • Frame for barrel & endcaps (HYTEC and LANL) • External support structure in central magnet (BNL) • Mechanical tolerances/distortions: • < 25 mm internally • 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

13. VTX Mech Support Structure (cont) • Clamshell Design: • Separates into two halves along the vertical axis • Modular Design: • Easily removable from IR • Allow for staged instrumentation • Mounted off of pole tips/nose cone calorimeter • To maintain specified tolerances

14. Routing for VTX Services Power, cooling and signal services are brought in at both ends, using the entire perimeter

15. VTX Auxiliary Systems • Services routed radially at the pole tips: • Power for Si detectors (proper grounding & isolation): • Si HV & LV power supplies • Cooling system for Si • Operating temperature: < 10o C • Improve signal/noise performance • Improve response to radiation dosage • Dry Air System • Bleed boil off from LN2 buggy into enclosure • Radiation Monitoring • TLDs & Chipmunks

16. Infrastructure for VTX • Electronics racks • Platforms above central magnet • Cooling for electronics • Power for auxiliary systems (proper grounding &isolation): • Clean & dirty power • 110V & 208V • UPS

17. Mechanical Structure

18. Mechanical Structure Budget Based on HYTEC cost matrix

19. Assembly of VTX

20. Assembly of VTX Budget

21. Infrastructure/Installation

22. Infrastructure/Installation Budget

23. Closing Remarks • Additional people power: • PHENIX-BNL Operations Group has 8 FTE technicians and 3 FTE engineers • VTX project will have a number of postdocs & students participating in these tasks • CA Experiment Support Group provides at least one mechanical engineer plus trades people (carpenters, riggers and electricians)

24. Backups

25. VTX Design Criteria for HYTEC • Clamshell Design: • Separates into two halves along the vertical axis • Detector Coverage: • Hermeticity: single overlap circumferentially • 160o coverage in each half of barrel section • 4 layers of pixels and/or strip detectors in barrel section • 180o coverage in each half of the endcap sections • 4 layers of pixel detectors in endcap sections • +/- 40o Envelope maintained around barrel section • Endcap pixel disks, utilities, and barrel detector end support outside of envelope • Main clamshell support structure inside of envelope, but less than 0.5% radiation length (RL)

26. VTX Design Criteria for HYTEC (cont) • RL of 1% or less for each detector layer (includes: detectors, structure, and utilities) • Dimensional and structural stability of less than 25 µm for detectors and 100 µm gravitational structural stability of entire tracker • Utility Routing: • Along barrel end support for barrel region • Radial at pole tips for the end caps • Mounting of Tracker: • Off of magnet pole tips • Tracker to behave as a rigid body structure • Operating Temperature: Room temperature (or possibly 0o C)

27. HYTEC Cost Matrix Updated 1/14/05 <10 centigrade + 15 Staging Barrel/Endcap + 20 DOE Proposal R&D 2005

28. Methods: Contingency • Design/prototype/testing : 25% contingency each cycle • To cover cost risk that an extra pre-production cycle is needed • Last design/prototype/testing cycle : 50% contingency • Testing, assembly, and installation tasks: 50% contingency • Purchases based on vendor quotes: 25% contingency • Other purchases, 50% contingency

29. Methods: Overhead • All numbers quoted for manpower are fully loaded $ • Material costs include local overhead + sales-tax • Funds moved from BNL to other institutions charged 9% BNL admin. overhead