GlueX electronics

Collaboration Meeting

May, 2004

Paul Smith

• 12,500 ADC channels• 8,200 TDC channels

Level 1 Trigger:200 KHz X5 KB/event= 1GB/sec

Digital PipelineDeadtimeless

~$3.5M

Cockcroft-Walton PMT base

Robotic Selective Assembly

QuickTime™ and aH.263 decompressor

are needed to see this picture.

Electronics Review

Andy Lankford (UC Irvine) and Glenn Young (ORNL)at the GlueX Electronics Review - July 23 2003

Single channel FADC prototype

Test bed for::

SPT converter chipXilinx chip and softwareMentor PCB & FPGA softwareIntellectual Property (PCI core)Robotic assembly

JLab TDC Module

“Electronics” View of Trigger/DAQ

Digital PipelineFront End“Digitizer”

FE/DAQInterface

Trigger

AnalogData To ROC

Event BlockBuffers

Every 64-256 events

Every event

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

Selected Review Conclusions:

• It is important to insure that the requirements on the electronics derive from the physics.

• 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,

• The manpower resources shown during the review will be inadequate for developing an electronics system of the scope required by GlueX.

• 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.

• The Committee feels that it is desirable to locate these modules in a radiation-free area if possible, in order to improve access.

CD-0• 5 years to beam!

BaBar required 100s of engineer-yearsGlueX currently has 2 electronics

engineersKey detector parameters still undefinedFunding profile unknownManagement plan unimplemented

Welcome new collaborators from Alberta and Oak Ridge!

Divide and Conquer

F,B Cal FADCs ~3000 channels8 Bits, 250 MSPSEnergy Sum for Level 1

dE/dX FADCs~3400 channels125/250 MSPS?8 Bit log vs 10/12 Bit linear

FDC cath FADCs~6000 channels62.5 MSPS?Positive input polarity

BCal FEPhotodetector, discriminator

TOF FEHV, discriminator

Tracking FE

Level 1 Trigger Clock/Sync/CalibTDCs

~8200 channels

Vertex Tracking TaggerHV, discriminator

Active Collimator

At least one engineer per sub-system:

FADC price/performance space

250 MSPS 125 MSPS 62.5 MSPS

8 bits SPT7721 $20 AD9289 $11 / 4 channel chip

10 bits MAX1124 $50MAX1122 $37

AD9411 $42

ADS5122 $43 / 8 channel chip

ADS5277 $40 / 8 channel chip

12 bits

AD9226 $20

LTC1741 $13

ADS5221 $14

ADS5273 $65 / 8 channel chip

14 bits AD5500 $95LTC1742 $25

ADS5422 $31

Next (final?) version of FCAL FADC6U

FADC

Clock/Sync

XilinxV2PRO

PIC

MG

2.1

6

SmallXilinx

Energy sum

Ethernet

Buy FADCs?

Gage

LeCroy

Acqiris Struck