New CLAS Level1 Trigger System

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During G12 run preparations on spring 2008 we decided to upgrade photon part of CLAS Level1 trigger system using CAEN v1495 logic unit. Eventually those efforts resulted in full Level1 system replacement: 6 level1 router boards and event processor board were replaced with one single v1495 unit equipped with 2 extra daughter modules. Trigger was commissioned during first phase of G12 run, last significant change was applied April 20, 2008. Most of the job was completed by Ben Raydo from Fast Electronics group. Valery Kubarovsky and Pawel Nadel-Turonski made generic trigger design and conducted trigger testing. Sergey Boyarinov, Nerses Gevorgyan and Hovanes Egiyan integrated new hardware and software components into CLAS online and slow control systems. Technical assistance was provided by Fast Electronic Group and CODA Group personal. Current document contains basic information about the system.

  • general layout
  • v1495-based logic
  • Windows-based GUI
  • system incorporation into CLAS Online and Slow control
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