HALL A Trigger and Data Acquisition

The following resources are available.

• An overview guide for running DAQ, trigger, and online software in Hall A, which includes the CODA 2.2 guide for running CODA 2.2 for Spectrometer DAQ.
• Charge Asymmetry is controlled with feedback and can be monitored with two codes :   qasy (spectrometer scalers)   and   pan (parity analyzer).
• G0 Helicity Mode.   Here is an overview and here are details about raw data related to the scheme.
• Instructions to download and check the trigger.
• Postscript Diagrams about our Trigger, the Right-Spectrometer Spectrometer, Left-Spectrometer Spectrometer, and Coincidence Circuit.   Detailed notes about trigger.
• How to use the Hall Accounting Software   (shift summary).
• How to use the portservers to connect to VME boards or HV crates.
• Here are some FAQs about computer deadtime, plus to calculate deadtime M. Liang provides a Monte Carlo for Deadtime.   A Year-2001 update on electronics deadtime in the trigger.
• Description of online codes dhist and dataspy.
• The code to monitor the rastered spot size:   SPOT   (aka raster++).
• The main link for ESPACE.
• An overview of the Raw Data Structure including CODA data, EPICS data, scalers, etc.
• If you are developing a CODA system here are some Hints on Installing CODA with emphasis on Linux.
• Our management policy for the work and cache disks.
• Towards a Hall A C++   Analyzer   :   The C++ based analysis package Root is being used to develop a Hall A physics analyzer.   Some contributions from me (which run independently or with the root analyzer): An event decoder   (untar, see README), and a Scaler class package.
• Elementary C++   Examples   :   Try my CODA classes which access CODA data via common interfaces to a CODA file or ET system.     A very simple example of looking at CODA files or ET online data and filling root plots was made for the DVCS test stand   (untar, see README).   A more complicated example that was used by RCS experiment, is an online code   :   dataspy++.
• Information about JLab computers and how to store or retrieve data from MSS can be learned from the computer center.
• Here is a link for learning how to do offline analysis using the JLab computer farm.
• CERN Library and other CERN Documentation from the CERN Documentation Server.
• Information about CODA, the DAQ toolkit developed by the Jefferson Lab DAQ group.