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PHENIX Safety Review Overview of the PHENIX Hadron Blind Detector

PHENIX Safety Review Overview of the PHENIX Hadron Blind Detector. Craig Woody BNL. September 15, 2005. Topics. Detector Gas system High voltage system Low voltage system, FEMs, cables Grounding Installation of detector near beam pipe Operation inside magnetic field. HBD Detector.

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PHENIX Safety Review Overview of the PHENIX Hadron Blind Detector

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  1. PHENIX Safety Review Overview of the PHENIX Hadron Blind Detector Craig Woody BNL September 15, 2005

  2. Topics • Detector • Gas system • High voltage system • Low voltage system, FEMs, cables • Grounding • Installation of detector near beam pipe • Operation inside magnetic field C.Woody, HBD Safety Review, 9/15/05

  3. HBD Detector Proximity focused Cherenkov detector • Uses deep UV transmitting gas (CF4) • with no gas window to detect Cherenkov • light from low momentum electrons • 50 cm of CF4 radiator • GEM detectors with CsI photocathodes • to detect Cherenkov light CsI layer (top GEM) 1.4 g CsI total (for entire detector) C.Woody, HBD Safety Review, 9/15/05

  4. HBD Prototype in Lab in Physics C.Woody, HBD Safety Review, 9/15/05

  5. HBD Gas System Single pass system for Run 6 Total detector volume ~ 626 l (313 l each side) Flow rate ~ 60 l/hr ( ~ 150 l/hr purge) Extensive gas monitoring to maintain O2 and H2O levels to a few ppm Pure CF4 R.Pisani C.Woody, HBD Safety Review, 9/15/05

  6. Gas Monitoring Gas monitoring near detector (under stairs by labyrinth) D.Lynch • H20 • O2 • VUV transmission McPherson 234/302 VUV spectrometer - uses pure argon as reference gas (no vacuum) - completely enclosed 30 W D2 lamp C.Woody, HBD Safety Review, 9/15/05

  7. High Voltage System • Commercial CAEN system • (SY2527 + A1732 modules) • located on top bridge above • Central Magnet • Maximum HV for detector < 4 KV • Maximum HV for A1732 is 6 KV, • but can be limited to 4 KV • 48 HV cables from bridge to • 24 voltage divider boxes located • near detector (~ 10 m) CAEN SY2527 A1732 • 168 short (~ 1m) HV • cables from divider • boxes to detector • Will use lab standard • RG-59 (A-30304) All connectors SHV (maximum rating 5 KVDC) C.Woody, HBD Safety Review, 9/15/05

  8. LV Distribution Entire System 47 A @ + 6.5 V 32 A @ - 7.0 V Individual boards also fused × 2 for safety Fuses Per cable (x 24) 1.9 A @ + 6.5 V 1.3 A @ - 7.0 V S.Boose C.Woody, HBD Safety Review, 9/15/05

  9. LV Power Cables S.Boose C.Woody, HBD Safety Review, 9/15/05

  10. Signal Cables C-Y. Chi Total length 10 m Individually shielded pairs Grouped in bundles of 16 pairs C.Woody, HBD Safety Review, 9/15/05

  11. Grounding System MVD Rack HV Distribution Box HV Supply FEM GEM Detector Preamp Board LV Supply +6.5 V -7.0 V return C.Woody, HBD Safety Review, 9/15/05

  12. Operation in Magnetic Field No magnetic components inside detector Will operate with inner and outer coils in opposite polarity producing very low magnetic field in the region of the detector C.Woody, HBD Safety Review, 9/15/05

  13. Backup Slides C.Woody, HBD Safety Review, 9/15/05

  14. HBD Gas System Current Status • Run6 simplified system • Single pass • Limited data logging • PC software in 2006 • Recirculation in 2006 R.Pisani C.Woody, HBD Safety Review, 9/15/05

  15. HBD System Parameters R.Pisani C.Woody, HBD Safety Review, 9/15/05

  16. HBD Full Gas System Schematic R.Pisani C.Woody, HBD Safety Review, 9/15/05

  17. FEM Organization • Crate Base system • 4 crates in a rack • 6UX 160mm IEEE 1101.10 Standard Crate mechanics – VME 64X etc. • Custom Backplane • All clock cables are 2mm Hard Metric cables • Signal cable/test pulse are 2mm Hard Metric cables • There are also Ethernet, Optical and power cables C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  18. Updated HBD FEM Diagram Crate Backplane Clock fanout ADC Optical out Test pulse Clock Master New Daughter card + DCM C-Y. Chi GTM/Ethernet C.Woody, HBD Safety Review, 9/15/05

  19. BackPlane AMP 25A Power Connector Ground BUSBAR +4V BUSBAR - 4V Analog - 4V Analog +5.5V Digital Ground BUSBAR C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  20. Clock Master ADC Board FUSE Clock Fanout Optical Transmitter C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  21. Use 2MM Hard Metric cable to move signals between preamp/FEM 2mm HM connector has 5 pins per row and 2mm spacing between pins and rows There are two types of cable configuration: *100 ohms parallel shielded cable 50 ohms coaxial cable Signal arrangement Our choice is S- S+ G S+ S- This gives us signal density 2mm x 10mm for every 2 signals. Same type of cables will be used for L1 trigger data. C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  22. Signal Cable • Meritec Custom 2mm Cable Assembly, 1X5 to 1X5 with 8 stack and 16 lines 700319-01, using polyester expando sleeving, 394” in length C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  23. C-Y. Chi C.Woody, HBD Safety Review, 9/15/05

  24. Readout Boards • Prototype - 68 channels • Final board - 96 channels • Power + 6.5 V, -7.0 V • ( ± 5V after regulators) • Preamps : 165 mW each • (  16 W/board) Voltage regulators Fuses B.Yu C.Woody, HBD Safety Review, 9/15/05

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