From lockyer@rutherford.hep.upenn.edu Fri Nov 30 12:14:26 2001 Date: Wed, 21 Nov 2001 00:48:55 -0500 (EST) From: Nigel S. Lockyer To: L2 trigger review committee , demaat@fnal.gov, gwf@fnal.gov, harold@frodo.uchicago.edu, lockyer@fnal.gov, luciano@fnal.gov, mlindgre@fnal.gov, mschmidt@fnal.gov, pjw@fnal.gov, rick@hep.upenn.edu, shochet@hep.uchicago.edu, spalding@fnal.gov Subject: L2 review Charge 11/21/01 Dear Mike, Below is the charge to your L2 review committee that will meet Dec. 7th at Fermilab. Let us know if anything is unclear to you or you need help with rooms etc. Thanks again for agreeing to chair this review. Recall that Peter Wilson and Luciano Ristori are ex officio. Jeff and Nigel --------------------------------------------------------------------------- The goal for CDF is to begin Run-II physics data taking in early January, 2002. The running configuration of the CDF detector will be optimized during December 2001 and "frozen" for data taking by January 11,2002. We emphasize, for this review, that this includes the physics content of the trigger table and the L2 trigger hardware. The installation, development, and commissioning effort on the Level 2 trigger has been intense since Run-II officially began in March 2001. Great progress has been made and the yeomen efforts of a few dedicated individuals is to be lauded. However, we still have not commissioned and run the complete L2 system. In order to achieve a stable operational condition, commissioning of the trigger system needed for the physics program in 2002 must be completed by early January. By this time, the CDF DAQ system will be dedicated to data-taking and will no longer be available for further commissioning. Alternative plans must be developed to allow continued development of the full L2 functionality. The near term goal for CDF is to achieve a "to tape" efficiency of 80% and striving for 90% in the long term. Emphasis on operating and maintaining the existing trigger system will therefore take priority. The Director has informed us that these "CDF performance numbers" will be reported to OMB. ------------------------------------------------------------------- L2 Hardware ----------------------------------------------------------------- In order for us to achieve these goals, the review committee should 1) Review the status of L2 commissioning and determine whether we have achieved the milestones presented at the Sept. 2001 collaboration meeting. 2) Recommend the schemes for providing at a minimum jet, electron and SVT triggers at L2 in a way that allows stable running at luminosities up to 5E31 by early January. 3) Review the proposed paths for commissioning the rest of L2, any improvements required in the system to implement the full CDF4718 trigger table and in particular plans that allow testing outside of the CDF DAQ system. The review committee should recommend: 1) the best hardware configuration for operation appropriate for the prescribed trigger table beginning early January. 2) the readiness of "backup solutions" for the SVT and L1 interface boards including the existence of the necessary hardware and software. 3) whether the "backup solutions" should be part of the baseline trigger for early January. 4) adequate spares exist for all L2 subsystems, 5) a well defined plan for L2 hardware pager coverage for each subsytem including names. ----------------------------------------------------------------------- Software ---------------------------------------------------------------------- The review committee should: 1) Review the status, goals, and resources allocated to Level 2 software. (trigger table and databases are not part of this review as they were covered in a previous review) The review committee should determine whether: a) L2 alpha software, including physics algorithm software, system support software, and testing procedures are adequate for stable running and quick recovery from failures. b) monitoring and debugging software is sufficient. c) there is sufficient L2 software pager coverage including names. --------------------------------------------------------------- Test stations -------------------------------------------------------------- Subsequent commissioning should be done in parallel. This requires a parallel L2 decision crate with an alpha and interface boards. Inclusion of trigger hardware at after January 1, 2002 can be allowed only after adequest testing and rate tests have been performed and the necessary software is complete and tested. The Review committee should recommend 1) procedures for testing, commissioning and including the remaining trigger systems 2) Review plans for the "2nd test crate" in the system. 3) Review plans for the test system proposed by Ted Liu.