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                Minutes of the TRIGGER MEETING, 02.07.2002

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                (1) ToF Status                    V.Grabski



     (1) ToF Status
     ---------------

     (a) Hardware

	 Last month there were some broken NIM cards and damaged NIM
	 crates.  For the cards some old modules were collected and they
	 are being tested.  Concerning the crates there are no spares left!

     (b) Data Quality Checking

	 The time reconstruction coefficients calculation (TOFC bank) is in
	 process.  The idea is to obtain the start time with measured
	 charges from the signal in different time periods by flash ADCs. 
	 The signals shapes are stable enough to extract the coefficients.

         For the direct efficiency calculation there is the idea to obtain
         it from the ratio of the coincidence rate with respect to the
         single layer rate.  Another idea is to compare backgrounds from
         vertex and TOF. Both methods are yet to be implemented.

         The TOF timing checking show (like from several weeks ago) that
         the signals are correct with the exception of an inconsistency on
         the widths that can be cross-checked with the times from the TDC
         signals.  Conclusion: There must be a problem in the reconstruction
         or in the TOFT bank.  TOFC bank has very old values and can be the
         source of the problem.


     (c) New ToF Read Out

         - Hardware

           The design of the new ToF readout is ready.  Installation and
           cabling of new hardware is underway.  Missing pieces are most
           notably the necessary NIM to ECL (PTL2000 hit readout) and NIM
           to TDC input standard converters:

                NIM --> ECL (diff) (16 chan)
                    PC-boards at DESY in 05.07.02

                NIM --> New TDC (32 chan)
                    NIM receiver (chip) ordered
                    PC-board ordered
                    Installation of electronics in r101 done

           Concerning the data transfer within the ETag/FNC subbranch it
           was suggested by I.Cheviakov to VSB connections instead of VICs.

         - Software

           A new read out program written in C has been developed.  The
           multi thread program is ready including interrupt handling, read
           and write tasks and buffer structures.


     (d) On-Line Monitoring

	 In the long-term the old monitoring system based on CAMAC readout
	 with the ToF Mac should be replaced.  For the new monitoring
	 scheme a simple client-server architecture is planned.  The server
	 program is already completed; client and graphical user interface
	 (GUI) remain to be done.