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SSD Power and Cooling on the Cone

SSD Power and Cooling on the Cone. STAR Integration Workshop Howard Matis May 16, 2008. The SSD. The SSD is a working detector. Background. Important for the HFT physics program It is being upgraded to be fully compliant with DAQ1000 The SSD NIM paper had 41 people

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SSD Power and Cooling on the Cone

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  1. SSD Power and Cooling on the Cone STAR Integration Workshop Howard Matis May 16, 2008

  2. The SSD

  3. The SSD is a working detector

  4. Background • Important for the HFT physics program • It is being upgraded to be fully compliant with DAQ1000 • The SSD NIM paper had 41 people • We are trying to do the upgrade with • Experienced but unattached SSD engineers • A few young scientists (software) • Several “highly experienced” physicists (hardware) • Manpower and resources limited • Have designed an upgrade path with very finite resources and to fit existing STAR upgrade funds

  5. Outline • Overview • Electrical past • Electrical future • Cooling past • Summary

  6. Existing Cables on the Cone • 20 groups of cables feeding ladder on each end • Readout on each end • Only need to bias detector on one end • Each group contains either • 3 round cables going to a rectangular connector (sense, LV, HV) • 2 round cables (sense, LV)

  7. Cable Bundles along the Cone Bundle (picture taken during Removal of SVT from STAR)

  8. 10 ADC boards Readout board 30 MHz BLVDS bus 3 MHz on a ladder shielded cable (2m) Ribbon cable (1m) Readout chain Two Shielded Cables per side

  9. Existing Space on the Cone(one side) (Rectangular Area  Area assuming cable is a square with the diameter of the cable) Low voltage cable may be smaller

  10. Previous Coolinghttp://www.star.bnl.gov/public/ssd/STAR_technique/ssd_cooling_system_doc_2.pdf • Cooling at a ladder level • Air is taken from inner STAR • 10 outputs go to East • 10 outputs go to West • 16 watt/ladder • 1/2” tubes with outer layer protection at exit of the cone (~3/4”) • Kinked hoses big problem

  11. Existing Cooling Diagram

  12. Output to Vortex Air from inner field cage

  13. Features of Existing Cooling System • Input air temperature defined by IFC TPC air temperature • Noticed more temperature failures on SSD as hall temperature increased • Design provides symmetric heat load on east and west TPC • Large cooler, very loud - Vortex • Hoses easily crimped • 20 tubes on each side in the vicinity of the SSD end • 10 tubes go under the cone

  14. Problems with existing cooling • Input air temperature • Is inner field cage controlled to 20 C as per original specifications? • Need a source of cool air • Hoses kink easily • Find stiffer hose that meets safety requirements • Vortex very noisy (acoustical) • Find new blower

  15. Cooling in new design • Need cooled incoming air • Symmetric cooling from east and west side • Cool evenly • Similar heat load on both sides of the TPC • 10 inputs and 10 outputs on each end • Total of 20 at each end • New electronics might take more power • Complete design so can calculate heat load • Assume can find BNL approved hoses which don’t kink at 0.5”

  16. Cables for Old/New Design

  17. SSD Upgrade • Power • Need to finish design to determine how much power • Reducing gauge of power wires requires a new power supply • Data • Two optical cables for each ladder (one per side) • Slow Control • 28 wire copper cable or • Two optical links per ladder (one per side) • need person to design (not budgeted for in SSD proposal) • Air Cooling • One tube on each end - sized to 1/2” aperture of SSD • Must have a source of cool air • Need a person to do a system design • Coordinate with HFT

  18. Howard Matis: Jim Proposes remove unshielded option. Fix left adjustment Proposed Designs on one end of the Cone* • *Warnings: • Need more resources to implement optical for slow control • Need to study if smaller cable diameter can be tolerated • Cooling design necessary to fix hose requirements

  19. Mechanical Mounts • Must maintain original attachment to the cone

  20. Integration Questions • What is new design of the cone? • What is the bend radius of pipes and cables allowed by the IST or FGT? • What is the path of the cables on the cone to the SSD? • Who is assigning space on the cone and drawing the design? • Air manifolds - location • Bend radii of cooling hoses • How to route cables and pipes on the cone? • How to cables and pipes from cone to ladders? • Where to get cold air? • Can SSD be cooled from one end? • Who will do this?

  21. Integration Questions (cont.) • Need space for the RDO boxes on the magnet end • Use existing SSD rack on South Platform • Need space for new air cooler (North Platform?) and hose • Cables in trays and festoon not significant change from before • Plenty of space in DAQ room • Must keep SSD mechanical mounts on cone

  22. Howard Matis: Wrong place Summary of SSD Upgrade • Ladders refurbished - same silicon • New ladder ADC and transmission to RDO Board • New RDO and connection to DAQ Room • Using standard STAR DAQ1000 electronics • New cooling system • Keep existing power cables

  23. Howard Matis: Jim proposes remove 55.4 cm2 Summary • Rectangular size of previous cables on the cone • 97.3 cm2 (counting both air hoses) • Rectangular size of current design (with contingency) • 180 cm2 – copper slow controls • 90.1 cm2 – optical slow controls (Needs engineering) • To do items • Approve SSD proposal and provide funds • Complete technical design to determine heat load • Coordination with HFT for cooling • Support for design of slow controls and cable design • Numerous integration issues

  24. Repair Status May 2008

  25. Current Situation • SSD in Nantes • All Ladders tested • No dead ladders • Ladder 7 fixed by replacing ADC and connection board

  26. Howard Matis: Fix slide Current Testing - Need 20 ladders • Six very good ladders • Seven Ladders with one bad hybrid (half module) • Those ladders may be fully “good” if the bias of the module is forced. • Nine Ladders with several bad modules • Some need to have the bias forced • Because of problem with JTAG chain, configuration can be determined with present software • Some improvement can be done • Four of these Ladders with a real high voltage trip. Can be good if capacitors replaced • Will result in 10 very good ladders ladders

  27. Summary with NO repair

  28. Comments • Currently STAR software requires both n side and p side for a track • Efficiency different if can allow only one side • 6 chips (ALICE128) are programmed by a JTAG chain • When there is a break, then chips cannot be programmed correctly • Current test software cannot bypass • Can be bypassed using STAR Slow Controls • Problem can be improved Can bypass and then lose 128 strips

  29. High Current • Capacitors are added to isolate power lines • Probably due to bad capacitor • Should be repairable • How to locate bad capacitors • Use infrared imagery

  30. Picture of Module Capacitors

  31. Infrared scan Power off Power on Power on Power off Bad Capacitor

  32. Summary • Efficiency good now • Better than 90% • Will improve

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