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STaRBoardSTaRBoard
Jamal RorieJamal Rorie
5/09/065/09/06
Physics 476Physics 476
Why do we need ToF info?Why do we need ToF info?
Used to determine Used to determine species of particlespecies of particle– Central Drift Chamber Central Drift Chamber
records pathrecords path– ToF records timeToF records time– B = 1.5TB = 1.5T– Apply Lorentz Force Apply Lorentz Force
LawLaw
Why do we need to upgrade?Why do we need to upgrade?
Currently Belle has a luminosity of Currently Belle has a luminosity of 1.6x101.6x103434 cm cm-2-2/s/s
New technique: crabbing the beamNew technique: crabbing the beam
Belle luminosity will be ~2-3x higherBelle luminosity will be ~2-3x higher
Background will be ~2-3x higher as wellBackground will be ~2-3x higher as well
Old ToF is not fast enough to handle this; Old ToF is not fast enough to handle this; a new technique must be testeda new technique must be tested
Data CollectionData Collection
TDC
Leading EdgeLo Level
Discriminator MeanTimer
1:3 Splitter
ADC
Leading EdgeHi Level
Discriminator
Leading EdgeLo Level
Discriminator
TDC
1:3 Splitter
Leading EdgeHi Level
Discriminator
ADC
PMT PMT
Timing SchemeTiming SchemeWhat did the PMT know and when did it know it?What did the PMT know and when did it know it?
Hi level - event triggerHi level - event trigger
Lo level - higher time resolution Lo level - higher time resolution
Readout SchemeReadout SchemeEvent trigger received
by STaR
Logic request to TDC
TDC polls for “hit” around requested time
TDC sends data,Logic queries ADC
No TDC data,Logic doesn’t query ADC
ADC sends data
COPPER I/O carries data downstream
Hit No Hit
COPPERCOPPER
COmmon COmmon Pipelined Pipelined Platform for Platform for Electronics Electronics ReadoutReadoutOne One standardized standardized card can card can control up to 4 control up to 4 boardsboards
STaR LayoutSTaR Layout
HPTDC
HPTDC
LAB3
LAB3
XC3S2000
COPPER
COPPER
16
16
CLK
The STaR BoardThe STaR Board
LABRADOR3LABRADOR38 8 Input ChannelsInput Channels
HPTDCHPTDC
332 input channels2 input channels– only 8 used when only 8 used when
configured for configured for high precisionhigh precision
Spartan3 Spartan3 456 456 pin pkgpin pkg(340 used)(340 used)
ADC BlockADC Block
ADCADC– LABRADOR3LABRADOR3
STaR takes in differential signal from STaR takes in differential signal from upstreamupstream– lower noiselower noise– modifications necessarymodifications necessary
Shaper to elongate signalShaper to elongate signal– Originally 3 GSPSOriginally 3 GSPS– Now 100-300 MSPSNow 100-300 MSPS
TDC, Logic, and I/O BlocksTDC, Logic, and I/O Blocks(not quite as exciting)(not quite as exciting)
TDCTDC– ECL-to-LVDSECL-to-LVDS– HPTDCHPTDC
LogicLogic– Spartan3 2000Spartan3 2000
I/O I/O – COPPERCOPPER
TestingTesting
Shaper TestShaper Test– Elongation goodElongation good– Standard delayStandard delay
confirmingconfirming
TasksTasks
CurrentlyCurrently– Firmware developmentFirmware development– Board populationBoard population
AheadAhead– Software developmentSoftware development– Firmware testingFirmware testing– FinalizationFinalization– KEK observations (mid-July)KEK observations (mid-July)
Online DocumentationOnline Documentation
http://www.phys.hawaii.edu/~jroriehttp://www.phys.hawaii.edu/~jrorie– SchematicsSchematics– UpdatesUpdates– CodeCode– DatasheetsDatasheets