DAQ WS02 Feb 2006 Jean-Sébastien Graulich Slide 1 DDAQ Hardware Architecture DDAQ Hardware Architecture o General Architecture o Tracker Baseline o TOF Baseline & Options o EmCal Baseline & Options o Trigger Baseline o Summary Jean-Sebastien Graulich, Geneva
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Question: Is CFD going to be precise enough ?Question: Is CFD going to be precise enough ? See other options
3 CFD in VME Crate
BNC Cable (RG213) TriggerLogic
MICE LCRMICE HALL
48 PMTs
1.5 TDC in VMESHV Cable
HV Power Supply
30+x m (TOF 0) or 27+x m (TOF 1) or 12+x m (TOF 2)
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 10
Timing is affected by the signal amplitudeTiming is affected by the signal amplitude
2 Usual Solutions: 2 Usual Solutions: Use Constant Fraction Discriminator (CFD) Measure amplitude and correct
TOF OptionsTOF Options
TimeWalk
Time over threshold
Thresh.
Tim
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alk
Co
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ctio
nExample from Harp
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 11
TOF OptionsTOF Options
Option 1. Constant Fraction Discriminator (CFD)Option 1. Constant Fraction Discriminator (CFD)The time walk is corrected automatically in the discriminator
Threshold value depends on the amplitude
Advantage: Advantage: Easy CablingEasy Cabling and and No ADCNo ADC
DrawbackDrawback No information at all on the charge (Energy
Option 4. Measure the Charge with Time Over Threshold Option 4. Measure the Charge with Time Over Threshold PrinciplePrinciple
Advantage: Advantage: Easy CablingEasy Cabling and and Charge Measurement Charge Measurement (not linear though)(not linear though)
Good PrecisionGood Precision for Time Walk Correction for Time Walk Correction
NINO = ASIC developed by CERN/MIC for Alice TOFNINO = ASIC developed by CERN/MIC for Alice TOF Discriminator with ToT “proportional” to the Charge (at low Discriminator with ToT “proportional” to the Charge (at low amplitude)amplitude) Proven technique, providing 50 ps resolution Proven technique, providing 50 ps resolution (IEE TNS Vol 51-5 (2004) 1974-(IEE TNS Vol 51-5 (2004) 1974-1978)1978)
Very Cheap: 2 EUR/chVery Cheap: 2 EUR/ch
Drawback Drawback Requires Board development !
Cost: TDC +Cost: TDC + Discri. board production (~50 EUR/ch) Discri. board production (~50 EUR/ch)
PMT NINO TDC
Trigger LogicWidth ~Charge
Rising edge + Trailing edge Time Measurement
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 15
EmCal Baseline EmCal Baseline Sensors: Sensors:
Hamamatsu R1355 (100 in hand, Ludovico is trying to find the other 140…)
Modified for differential output (100 Ohms)
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 16
EmCAl BaselineEmCAl Baseline
Front End Electronics:Front End Electronics: Splitters Discriminators TDC: CAEN V1190 (128 ch, ECL or LVDS input) ADC: No Baseline defined yet
Number of ChannelsNumber of Channels 240 ADC 120 TDC in the BaselineTime information is useful for
Hit Position information in the direction // to the slab Suppression of muon decay background (the muons
are stopped in the EmCal and ready to decay when the next muon arrives, disturbing PID)
-> My personal feeling: TDC needed for all the channels
If we can fit the rising edge, time resolution can be much higher than the 5 ns of the sampling rate.
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 22
Readout Trigger Readout Trigger BaselineBaseline
6 Event Types:6 Event Types: Normal Event (RF ON or RF OFF) Start of Spill
make sure the DAQ is ready for Normal Event End of Spill
should Contain the relevant MCM data Empty Event (Pedestals) Pulser Events Cosmic/Source Events
1 trigger receiver input per Event Type1 trigger receiver input per Event Type 1 trigger receiver output per Event Type 1 trigger receiver output per Event Type
(busy) + 1 common(busy) + 1 common Trigger receiver is a simple VME IO Register Trigger receiver is a simple VME IO Register
3 Particle Trigger conditions for Normal Events3 Particle Trigger conditions for Normal Events Beam: Burst x TOF0
Timing given by TOF0
Upstream: Beam x TOF1 Timing given by TOF1
Traversing: Upstream x TOF2 Timing given by Upstream
TOFn is defined by a twofold coincidence of the OR of the 12 (8) slabs of a single layer
Should be possible to add Traversing Muon, using Should be possible to add Traversing Muon, using EmCal informationEmCal information
If it’s really only these 4 conditions, there is no need If it’s really only these 4 conditions, there is no need for PLU. One simple I/O register is enoughfor PLU. One simple I/O register is enough
Option: CMAC PLU (available in Geneva). Requires CAMAC-VME or CMAC PCi Interface
For Empty and Pulser Events, the particle trigger is For Empty and Pulser Events, the particle trigger is generated by the DAQ systemgenerated by the DAQ system
For Cosmic Events, the particle trigger is set up locally For Cosmic Events, the particle trigger is set up locally by the subsystem who wants it by the subsystem who wants it
DAQ WS02 Feb 2006
Jean-Sébastien Graulich Slide 24
SummarySummary
Tracker Baseline has to be updated Tracker Baseline has to be updated for AFEtfor AFEt
TOF Baseline is well defined and TOF Baseline is well defined and several options will be testedseveral options will be tested
EmCal Baseline is not clear (Charge EmCal Baseline is not clear (Charge measurement)measurement)
Trigger Baseline is well defined, no Trigger Baseline is well defined, no problem expected thereproblem expected there