PHENIX Safety Review Overview of the PHENIX Hadron Blind Detector Craig Woody BNL September 15, 2005 C.Woody, HBD Safety Review, 9/15/052 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, 9/15/053 HBD Detector Uses deep UV transmitting gas (CF 4 ) with no gas window to detect Cherenkov light from low momentum electrons 50 cm of CF 4 radiator GEM detectors with CsI photocathodes to detect Cherenkov light Proximity focused Cherenkov detector 1.4 g CsI total (for entire detector) CsI layer (top GEM) C.Woody, HBD Safety Review, 9/15/054 HBD Prototype in Lab in Physics C.Woody, HBD Safety Review, 9/15/055 Total detector volume ~ 626 l (313 l each side) Flow rate ~ 60 l/hr ( ~ 150 l/hr purge) HBD Gas System Pure CF 4 Single pass system for Run 6 Extensive gas monitoring to maintain O 2 and H 2 O levels to a few ppm R.Pisani C.Woody, HBD Safety Review, 9/15/056 Gas Monitoring McPherson 234/302 VUV spectrometer - uses pure argon as reference gas (no vacuum) - completely enclosed 30 W D 2 lamp H 2 0 O 2 VUV transmission Gas monitoring near detector (under stairs by labyrinth) D.Lynch C.Woody, HBD Safety Review, 9/15/057 High Voltage System CAEN SY2527 A1732 Commercial CAEN system (SY 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) 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, 9/15/058 LV Distribution S.Boose Entire System V V 2 for safety Per cable (x 24) V V Individual boards also fused Fuses C.Woody, HBD Safety Review, 9/15/059 LV Power Cables S.Boose C.Woody, HBD Safety Review, 9/15/0510 Signal Cables Total length 10 m Individually shielded pairs Grouped in bundles of 16 pairs C-Y. Chi C.Woody, HBD Safety Review, 9/15/0511 Grounding System HV Supply LV Supply FEM Preamp Board GEM Detector HV Distribution Box +6.5 V -7.0 V MVD Rack return C.Woody, HBD Safety Review, 9/15/0512 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, 9/15/0513 Backup Slides C.Woody, HBD Safety Review, 9/15/0514 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, 9/15/0515 HBD System Parameters R.Pisani C.Woody, HBD Safety Review, 9/15/0516 HBD Full Gas System Schematic R.Pisani C.Woody, HBD Safety Review, 9/15/0517 FEM Organization Crate Base system 4 crates in a rack 6UX 160mm IEEE 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, 9/15/0518 Updated HBD FEM Diagram Clock Master Clock fanoutADC Optical out Backplane Crate GTM/Ethernet New Daughter card + DCM Test pulse C-Y. Chi C.Woody, HBD Safety Review, 9/15/ V BUSBAR - 4V Analog Ground BUSBAR +5.5V Digital Ground BUSBAR AMP 25A Power Connector BackPlane C-Y. Chi C.Woody, HBD Safety Review, 9/15/0520 FUSE ADC Board Clock Master Optical Transmitter Clock Fanout C-Y. Chi C.Woody, HBD Safety Review, 9/15/0521 S-S+G S- Signal arrangement 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 Our choice is 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, 9/15/0522 Signal Cable Meritec Custom 2mm Cable Assembly, 1X5 to 1X5 with 8 stack and 16 lines , using polyester expando sleeving, 394 in length C-Y. Chi C.Woody, HBD Safety Review, 9/15/0523 C-Y. Chi C.Woody, HBD Safety Review, 9/15/0524 B.Yu Prototype - 68 channels Final board - 96 channels Power V, -7.0 V ( 5V after regulators) Preamps : 165 mW each ( 16 W/board) Readout Boards Voltage regulators Fuses