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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. - PowerPoint PPT Presentation
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PHENIX Safety Review
Overview of the PHENIX Hadron Blind Detector
Craig Woody BNL
September 15, 2005
C.Woody, HBD Safety Review, 9/15/05 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
• 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
Proximity focused Cherenkov detector
1.4 g CsI total (for entire detector)
CsI layer(top GEM)
C.Woody, HBD Safety Review, 9/15/05 4
HBD Prototype in Lab in Physics
C.Woody, HBD Safety Review, 9/15/05 5
Total detector volume ~ 626 l
(313 l each side)
Flow rate ~ 60 l/hr ( ~ 150 l/hr purge)
HBD Gas System
Pure CF4
Single pass system for Run 6
Extensive gas monitoring to maintain
O2 and H2O levels to a few ppm
R.Pisani
C.Woody, HBD Safety Review, 9/15/05 6
Gas Monitoring
McPherson 234/302 VUV spectrometer - uses pure argon as reference gas (no vacuum) - completely enclosed 30 W D2 lamp
• H20• O2
• VUV transmission
Gas monitoring near detector (under stairs by labyrinth) D.Lynch
C.Woody, HBD Safety Review, 9/15/05 7
High Voltage System
CAEN SY2527
A1732
• 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)
• 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
S.Boose
Entire System47 A @ + 6.5 V32 A @ - 7.0 V
× 2 for safety
Per cable (x 24)1.9 A @ + 6.5 V1.3 A @ - 7.0 V
Individual boards also fused
Fuses
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
Total length 10 m
Individually shielded pairs
Grouped in bundles of 16 pairs
C-Y. Chi
C.Woody, HBD Safety Review, 9/15/05 11
Grounding System
HV Supply
LV Supply
FEM
PreampBoard
GEMDetector
HVDistribution
Box
+6.5 V-7.0 V
MVD Rack
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
Clock Master
Clock fanout ADCOptical
out
Backplane
Crate
GTM/Ethernet
New Daughter card + DCM
Test pulse
C-Y. Chi
C.Woody, HBD Safety Review, 9/15/05 19
+4 V BUSBAR- 4V Analog - 4V Analog
Ground BUSBAR
+5.5V Digital
Ground BUSBAR
AMP 25A Power Connector
BackPlane
C-Y. Chi
C.Woody, HBD Safety Review, 9/15/05 20
FUSE
ADC Board Clock Master
Optical TransmitterClock Fanout
C-Y. Chi
C.Woody, HBD Safety Review, 9/15/05 21
S- S+ G S+ 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, 9/15/05 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
B.Yu
• Prototype - 68 channels• Final board - 96 channels• Power + 6.5 V, -7.0 V ( ± 5V after regulators)• Preamps : 165 mW each ( 16 W/board)
Readout Boards
Voltage regulators
Fuses