DAQ and Trigger Systems for CLAS12

	TDR supporting slides
	June 2007

CLAS DAQ Analysis

	CLAS DAQ performance (10kHz event rate, 35MB/s data rate, <15% dead time) is close to CLAS12 requirements (10kHz, 100MB/s, <15%)
	FASTBUS ADCs will be replaced with Flash ADCs
	Pipeline TDCs will be reused, new channels will be equipped with the same kind of modules
	CAMAC discriminators will be replaced with JLAB-made modiles
	FASTBUS 1877 TDCs will be reused for drift chambers, VME backup solution will be provided
	ADB electronics will be partially reused, partially redesigned
	Completely new trigger system will be built

CLAS12 Data Acquisition System

	4108 channels of Flash ADCs and TDCs/discriminators collecting data from two calorimeters, two cerenkov counters and three time-of-flight detectors
	12096 channels of TDCs collecting data from Drift Chambers
	41 VME/VME64X/VXS/FASTBUS crates equipped with Readout Controllers and Trigger Interface Units
	CODA DAQ software

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CLAS12 Trigger System

	Trigger system study is completed based on high energy CLAS data
	CLAS12 trigger system conceptual design is completed; it includes fast detector-based Level1 trigger and Drift Chamber-based Level2 trigger subsystems (see following slides)
	Future development includes CLAS12 simulation-based trigger study and electronics design

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CLAS12 computing and network

	CLAS online cluster is fast enough already to satisfy CLAS12 requirements, except data storage and data link to the JLAB computer center
	Most of computing and network equipment will be upgraded in following years because of aging and maintenance reasons

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CLAS12 Experiment Control System

	New Experiment Control System (ECS) will be adopted for CLAS12
	ECS will include monitoring, control and calibration subsystems
	CLAS12 DAQ and Trigger systems will be incorporated into ECS

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