ToF Readout UpgradeToF Readout Upgrade

Jamal RorieJamal Rorie

1/31/061/31/06

Physics 476Physics 476

BackgroundBackground

Particles exit the beam chamber Particles exit the beam chamber with known momentumwith known momentum

ToF allows us to determine the ToF allows us to determine the mass of the particlemass of the particle

Luminosity of beam has increased Luminosity of beam has increased 2-fold2-fold

OverviewOverview

1: 3 spl i t 1:3 spl i t

Leadi ng Edge

Di scri m. wi th

l ow threshol d

Leadi ng Edge

Di scri m. wi th

hi gh threshol d

Leadi ng Edge

Di scri m. wi th

l ow threshol d

Leadi ng Edge

Di scri m.wi th

hi gh threshol d

ADCADCHPTDC HPTDCMean Ti mer

PMT2PMT1 176 Barrel TOF

L1 Tri gger L1 Tri gger

To Tri gger Modul e

gate gate

L1 TriggerL1 Trigger

PMT PMT

Board OverviewBoard Overview

SpecsSpecs

Fast PMT (input)Fast PMT (input)• Rise Time ~ 4nsRise Time ~ 4ns• Fall Time ~ 8nsFall Time ~ 8ns• Pulse Magnitude <~4 VPulse Magnitude <~4 V• Trigger Rate up to Trigger Rate up to

1kHz1kHz

Board RequirementsBoard Requirements• Charge MeasurementCharge Measurement

– 1GSPS or greater1GSPS or greater– Negligible dead time Negligible dead time

(ping pong)(ping pong)– 16 channel in16 channel in

• Time MeasurementTime Measurement– Low and high Low and high

thresholdthreshold– 16 channel in16 channel in– 25 ps resolution25 ps resolution

• COPPER outCOPPER out

PartsParts

HPTDCHPTDC Lab 3Lab 3 Spartan 3Spartan 3

GoalsGoals

Board by 3/3/06Board by 3/3/06 Firmware by 4/7/06Firmware by 4/7/06 Testing done by mid-MayTesting done by mid-May