e906/drell-yan: monte carlo, data acquisition and data analysis paul e. reimer expected rates and...
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E906/Drell-Yan:Monte Carlo, Data Acquisition and Data Analysis
Paul E. Reimer
Expected Rates and Monte Carlo (WBS 2.5.1)
Data Acquisition (WBS 2.4)
– CODA– Latched data– TDC data
Data Analysis (WBS 2.5.2)
211 December 2006 E906/Drell-Yan Review: Data Acquisition and Analysis
Data Sources
256 Hodoscopes—bit latches
MWPC 5500 Channels
bit latches
Station 2 & 3Drift Chambers1700 ChannelsMulti-hit TDC’s
Station 4 PropTubes 400 Channels
Bit latches
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Data Acquisition Framework: CODAWBS 2.4.1
The CODA (CEBAF Online Data Acquisition) software frame work will be used for Data Acquisition
CODA is a software toolkit from which data acquisition systems with varying degrees of complexity can be built.
A typical system might look
Single Board Computer
FASTBUS VME CAMAC
ROC rcServer
EB
ROC
Network: Ethernet FDDI ATM
UNIX/LINUX
DISK/ TAPEET
User Proc.
RunControl GUI
ER
cdev
dp_tcl
mSQL Database
msqld cmlogServer
cmlog Database
Take from D. Abbot, CODA Users Workshop 2004
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DAQ: Latch Electronics
Station 1 MWPC, Station 4 Prop. Tubes and Hodoscope readout
Readout will be based on the Nevis system
Equipment recovered from E866/NuSea and E871/HyperCP (approx. 20k ch. )
Detector Channel
Count
Tracking Station 1
MWPC
5500
Station 4
Prop. Tubes
400
Hodoscopes All Stations 256
Total 6156– Ansley delay cables– Coincidence Registers (CR)– Encoder board (ENC) and – FIFO cards
Rate will not be a problem—HyperCP had 20k channels and a trigger rate of 75 kHz—deadtime of approx. 3s
From Y.C. Chen et al. NIM A 455 (2000) 424
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DAQ: Multi Hit TDCWBS 2.4.2, 2.4.3
Station 2 and 3 drift chambers readout via multi-hit TDC (1700 channels plus spares)
Fermilab Prep has sufficient channels of LeCroy 3377 FERA TDC Dead time of 1.8s + 0.1s/hit
Fermilab PREP recommends testing these modules prior to experiment and has offered to supply test procedures and setup. E906 will supply labor
FERA readout options under exploration
– LeCroy 1190 FERA to VME memory interface
– Struck SIS3700 32-bit ECL input FIFO (VME module) http://www.struck.de/sis3700.htm
– Fermilab DYC3 FERA to RS485 interface http://ppd.fnal.gov/elec/dyc3/dyc3nov.html
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Data Storage
Total data set for 5.2£1018 protons is approximately 4 TB
(1 kHz/2£1012 protons £ 1.5 kB event size) Temporarily store data locally on disk Background spool data to Feynman Computing Center for long
term storage (discussed with Fermilab CD)– Sustained data rate of 125 kB/s (easily within network
capacity)
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Analysis SoftwareWBS 2.5.2
Modification of existing E866 analysis codes– Track recognition, trace back and
energy loss algorithms are identical– E866 code already ported to Fermilab
computing farms—probably not necessary.
– New event decoding routines needed Computing requirements
– Minimal—E866 event analysis rate was approx. 20 ms/event on vintage 1997 HP PA8000 0.18 GHz
– Scale to today: Should be able to do real time analysis of all data on small cluster (1 to 4) Linux-based PC’s
– We do not anticipate heavy demand on computing resources
811 December 2006 E906/Drell-Yan Review: Data Acquisition and Analysis
Monte Carlo simulations
GEANT-Based Monte Carlo
– Simulation of detector through end of 1st magnet
– Used for configuration of hadron absorber within aperture of 1st magnet and particle rates at Station 1
– Extend simulation to entire spectrometer for data analysis (WBS 2.5.1 Abilene, Los Alamos, Argonne)
FastMC
– Modified version of E866/E772 “fast” Monte Carlo Code to include E906 geometry.
– Only traces muons from Drell-Yan events, and the decays of J/, 0, , 0, 00, D (D-bar) and K decays.
– Magnetic field is simplified, but muon energy loss and multiple scattering are included.
– Verified with• E866 rate and resolution comparisons• full GEANT simulation of target, beam dump and absorber
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Conclusions
DAQ – CODA framework from JLab– Latched readout via Nevis electronics– Drift Chambers via LeCroy 3377 TDC
Data Analysis – Code is straight forward modification of E866 Analysis– Data storage requirements are “small”– CPU requirements are small