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GlueX electronics
Collaboration Meeting
December, 2003
Paul Smith
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• 12,500 ADC channels• 8,200 TDC channels
Level 1 Trigger:200 KHz X5 KB/event= 1GB/sec
Digital PipelineDeadtimeless
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Electronics Review
Andy Lankford (UC Irvine) and Glenn Young (ORNL)at the GlueX Electronics Review - July 23 2003
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Generic Front End
• Preamp parameters chosen for improved S/N, signal rates, power dissipation, etc.
• On-detector digitization decreases cabling requirements but increases complexity and imposes more stringent requirements on reliability.
• Copper links should be used in high radiation areas.
Pole-Zero CR-(RC)n
Semi-Gaussian Shaper
BLR
is Cd
Cf
Rf
Driver
DiscriminatorLE, CFD, ZC
ADC Pipeline
Copper Fiber
To DAQ
Digitization
Preamp
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Single channel FADC prototype
Test bed for:
• SPT converter chip
• Xilinx chip and software
• Mentor PCB & FPGA software
• Intellectual Property (PCI core)
• Robotic assembly
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Next (final?) version6U
FADC
Clock/Sync
XilinxV2PRO
PIC
MG
2.1
6
SmallXilinx
Energy sum
Ethernet
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Cockcroft-Walton PMT base
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Robotic Selective Assembly
QuickTime™ and aH.263 decompressor
are needed to see this picture.
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F1 TDC Block Diagram
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JLab TDC Module – Top & Bottom Sides
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“Electronics” View of Trigger/DAQ
Digital PipelineFront End“Digitizer”
FE/DAQInterface
Trigger
AnalogData To ROC
Event BlockBuffers
Every 64-256 events
Every event
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Level 1 includes:
• Forward calorimeter energy sum
• Barrel calorimeter energy sum
• Track counts:– Vertex– Barrel– Forward
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Photon Rates
Level 1
Level 3
PhysicsSignal
Software-basedLevel 3 System
Start @ 107 /sOpen and unbiased triggerDesign for 108 /s 15 KHz events to tape
Level 1 trigger systemWith pipeline electronics
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Selected Review Conclusions:
• The decision to standardize all detector readout on a single TDC module design and a single Flash ADC module design is good, and will help simplify the overall electronics system design in a constructive way and conserve valuable engineering resources.
• More manpower will be needed in order to fully realize the GlueX electronics system. Considerable special (technical) expertise will also be required.
• The requirements and specifications of the analog front-end electronics are not yet adequately defined. This is coupled to the tentative status of some detector designs. The lack of full definition of detector designs may soon limit progress on electronics design,
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Integration
• Electronics racks near detector (~100)
• Short cables, no extra delay
• Fiber optic connections from detector to counting house
• Access to detector components without uncabling
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Integration
SolenoidTracking
Cer
enko
v
TO
F
FC
AL