OWG Meeting 6-Jan-2010

Agenda

• Announcements
• Review of minutes from 8-Dec-2009 meeting
• Hall B discriminator - Ben
• JANA remote monitoring/control facility PDF - David L
• deferred to next meeting - BNL NSLS-II PLC evaluation (full vsn) (summary)- Elliott
• deferred to next meeting - PLC control system - Elliott
  • Allen-Bradley Point I/O for RS232 communication
  • Common Industrial Protocol (CIP) over Ethernet/IP vs over ControlNet, copper vs fiber
  • Direct EPICS to Ethernet/IP communications
  • Web access using 1756-EWEB module
  • XML program storage
  • Alarming, paging, email
• Java online event display based on Dave Heddle's framework, HDDM and EVIO.
• Coil test update - Elliott
• Other electronics and trigger status reports - Fernando, Chris, Ben, Ed, Alex, Dave

Time/Location

1:30 PM Wed 6-Jan-2010 CC F326

Next Meeting

1:30 PM Wed 20-Jan-2010

Minutes

Attendees: Elliott W, Beni Z, Simon T, Ben R, Fernando B, Alex S, Lubomir P, Carl T, Vardan G, Pedro Toledo.

Hall B Discriminator

Ben described recent work on a discriminator developed for Hall B. Fernando says it fits Hall D needs perfectly, and is much cheaper and better than the CAEN V895 discriminators we were planning to use.

• 16-channel dual-threshold, non-updating, 0 -> -1V.
• Includes many scalers.
• Standard VME mount.
• Very similar to CAEN V895 but about one half the cost.
• 200 needed for CLAS12, about 200 for Hall D.
• Very low cross-talk and noise.
• Will have 5 for Hall B and 2 for Hall D fairly soon for testing.
• See Ben's slides for many more details.

JANA Remote Control

Dave described a new remote control feature for JANA processes.

• Framework for controlling monitoring and level 3 farms, also useful for control/monitoring of offline farm jobs.
• Based on cMsg (same as ROOTSpy).
• Uses very simple subject/type/text conventions for message routing and response.
• Still need to extend the JANA control language and allow for user customization.
• Should allow easy integration with DAQ system via use of a farm manager CODA component.
• JANA processes would not be CODA components, just the farm manager.
• Farm manager will probably have to be developed by Hall D as DAQ group thinks it is too experiment-specific.
• Could use AFECS to control farm processes, not clear if this would be an advantage.
• Farm processes will get events from the ET system, control is via cMsg system.
• See Dave's slides for many more details.

Online Event Display

Elliott reported on recent work done by Dave Heddle. He is scheduled to talk at the next Online meeting.

• Dave Heddle presented preliminary event display to CLAS12.
• Framework designed to be experiment-independent. Only about 15% of his code is specific to CLAS12.
• Currently reads EVIO format events, since EVIO will be output from the CODA DAQ system.
• Elliott will write HDDM-to-EVIO converter so that we can try event display with Hall D events.
• Dave will implement "toy" geometry for us if we supply him with the geometry information.