DVCS Trigger System

Current section contains DVCS Calorimeter Trigger System development materials.

Coordinator: Sergey Boyarinov

Leading developer: Benjamin Raydo

Support: Stepan Stepanyan, Rustam Niyazov

Project in progress

First approach to System Requirements (September 2007) (PowerPoint, HTML).

Ben's presentation on CLON meeting 3-Oct-2007: preliminary design.

Ben's first approach to the DVCS Cluster finding 8-Oct-2007.

Sergey, Rustam (Oct-9-2007 through Oct-16-2007):

Calibration data: 10000 events ascii file generated from dvcs_047213.A00. Pedestals were used as for the run 46595 with
the beam current=20 nA (presented on this plot).

Calibration data subset: About 3200 events ascii file contains pi0 events only. That file can be considered as a sample
of 'good' events, trigger system should pass all of them.

Production data: 10000 events ascii file generated from clas_047210.A01 using pedestals for run 46595.
ASCII file containing all 'good' events from the same datafile (actually all events from so-called
skim file egg_47210_pass1_a01.bos).

Ben's presentation on CLON meeting 10-Oct-2007: Cluster Finding.

Ben's observations on DVCS data processing 10-Oct-2007.

Ben's preliminary results on DVCS Trigger efficiency studies 11-Oct-2007.

Ben's results on DVCS Trigger efficiency studies 17-Oct-2007.

Updated System Requirements on 19-Oct-2007 (PowerPoint, HTML, pdf).

Ben's ideas on DVCS-Hodoscope trigger system design 19-Oct-2007.

Ben's preliminary design for DVCS-Hodoscope trigger system (ppt).

Sergey ordered CAEN hardware 7-Nov-2007 based on Ben's recent design, quotation is here.

Ben's "semi-final" design for DVCS-Hodoscope trigger system (9-Nov-2007): generic scheme (pdf), Altera Project (tar.bz2). Some changes may be applied, in particular Ben is working to resolve some timing issues: measure V1495 channel skews, lock in timing requirements on the synchronous bus and compile a "final" FPGA design. These timing details will determine the LEMO/Coax cable length that were left unspecified. More accurate timing information will be provided also on the trigger propagation delay.

9-Nov-2007: project posponded until receiving CAEN hardware in February 2008.

Useful documentation

CAEN V895 Discriminator Manual Revision 2, September 2002, pdf.

CAEN V1495 Logic Unit Manual Revision 4, January 2007, pdf.

V1495-related software downloaded from CAEN site on September 25, 2007 (check CAEN for newer versions !):

• V1495 DEMO USER FPGA Firmware

• V1495 VME FPGA Firmware

• Quartus2 Project

• Firmware upgrade tool (Windows executable file

• V1495 Firmware Upgrade Tool (source code and VC++ project)

Our materials:

• CLAS version of V1495 Firmware Upgrade Program - CAEN version slightly modified by Sergey Boyarinov, see usage example inside; runs from VxWorks prompt