- BEMC
- EEMC
- ETOF
- FCS
- FGT
- FGT. . . . . . . . . . I N S T R U C T I O N S
- FGT. . . . . . . . . . P H Y S I C S
- FGT. . . . . . . . . . S I M U L A T I O N S
- FGT. . . . . . . . . H A R D W A R E -- D E T E C T O R
- FGT . . . . . . . . . . A N A L Y S I S
- FGT . . . . . . . . . . C A L I B R A T I O N
- FGT . . . . . . . . . . D O C U M E N T S
- FGT . . . . . . . . . . DAQ
- FGT . . . . . . . . . . M E E T I N G S
- FGT. . . . . . . . . . H A R D W A R E -- E L E C T R O N I C S
- FGT. . . . . . . . . . H A R D W A R E -- S L O W C O N T R O L S
- FGT. . . . . . . . . . P H O T O - - G A L L E R Y
- FGT. . . . . . . . . . S O F T W A R E
- FGT. . . . . . . . . . V A R I A
- FGT. . . . . . . . . . x -T R A S H (node for recycling)
- FPD & FMS & FPS
- FTPC
- FTT
- HLT
- L3
- PMD
- PP2PP
- RICH
- Roman Pot Phase II*
- SSD
- SVT
- Slow Controls
- TPC
- TRG
- Trigger Detectors
- VPD
- test
Event size estimation
Updated on Thu, 2008-10-02 12:19. Originally created by balewski on 2008-10-02 10:57.
Under:
Estimation of FGT event size for pp events @ 500 GeV is 20KB/eve after ZS, physics event will use 80% of this volume.
- empty event: 3.7KB Concluding: for 3-sample empty events we need 3.7 KB 300*(2+2+2+2)+30000*(2+2+2+2)/200+100=3700 bytes.
- total # of channels: 128 ch X 10 APV x4 quad x 6 disks = 30K channels.
- zero suppression (ZS) is aiming to keep 1/100 of ADC channels, set to about 3 sigma above ped. Needs testing with data & real electronics, time stability, beam halo, AC-noise . Perhaps we can ZS more.
- with ZS we need 4 bytes per hit:
- we need 2 bytes (log2(30k)=14.9) for channel ID
- ADC value needs up to 12 bits, assume we write it as 16 with 4 bits unused, as with ESMD
- we may want to keep ADC for 3 time slots per event (using 25 ns integration window) increasing hit size to 8=4+2+2 bytes.
- it is enough to keep 1/1000 events w/o ZS for monitoring of pedestals
- event header needs 100 bytes
- pp data taking
- assume every track fires 5 strips (will be more at Rin and less at Rout due to varied width of phi strips)
- trigger event is always embedded in 6 minBias pileup events
- at top RHIC luminosity we have 1.5 minB interactions per bXing
- 300 nsec of analog pulse --> need to account for 4 pre-trigger bXings --> 4x1.5=6 minB eve/trig eve
- based on OLD Pythia simulations (obsolete disk size & location) @ 500 GeV one expects 1 track per quadrant per minB event.
conclusion: 1440 ADCs will fire due to underlying pileup event (4 tracks * 6 disks * 2 planes *6 events *5 strips= 1440 - W-trigger will fire mostly on jets, ASSUME HT consumes lot of jet energy and there is 10 charged (low pT) tracks in such jet. 10 tracks * 6 disks * 2 planes * 5 strips= 600 ADCs. total physics event content will be 2000 ADC channels. This requires 16KB (2000 *8 bytes)
- Heavy Ion even - no study was performed so far.
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