Minutes of the ST-Testbeam Run-Meeting - July 1, 2004
=====================================================

General
-------

1) The daily run meeting will be held at 15:00 in the
   controlroom

2) Shifts between Monday 8:00 and Tuesday 8:00 have been
   cancelled, since due to CPS intervention there will be
   no beam that day.

3) After the Sunday meeting the Run-Coordination will
   be taken over by Johan.



Testbeam Program
----------------

 The initial testbeam setup does consist of

   - irrad LHCb1 10 y       / Beetle 1.3  R/O
   - reference LHCb1        / Beetle 1.3  R/O
   - CMS3 with Kapton cable / Beetle 1.3  R/O
   - CMS3 no cable          / Beetle 1.2  R/O


 The following summary is an edited version of the discussion
 at the run meeting. It is intended as an attempt to put the
 outcome into a coherent picture, to be  dicussed again and in
 its final version endorsed at the run meeting on July 3.


 1) complete the comissioning of the system
    > split the power net for the setup into two segments
    > comission beam and telescope
      - find correct beetle latency
      - align telescope
      - check the beam spot position and size
    > adjust the gate for the trigger
    > determine nominal latency for the Beetles


 2) mandatory program

    I) HV scan
       for Vfs=400 and Vfs=100
       peak scan +-20ns in steps of 5 ns around the nominal timing

       - 50k events per point
       - proposed scanning strategy:

         a) start with HV at a central value
              CMS-type sensors : 250 V
              LHCb-type sensors: 120 V
            and go in steps  of
              50 V  for CMS type sensors
              30 V for LHCb type sensors

         b) first go down in steps until the signal is gone

         c) then go up, if possible as high as 500V, at setting of
            the intermediate values

         d) if time permits go back to the nominal voltage, again
            filling the intermediate points

            example of a possible scan sequence
            for the case of CMS-type modules:

            250, 200, 150, 100, 50,
             75, 125, 175, 225, 275, 325, 375, 425,
            400, 350, 300, 250

    II) pulse shape scans
        for Vfs=400 and Vfs=100
        for HV setting of 1.5x and 2x the depletion voltage
        100 k events per point

        - proposed scanning strategy:

          a) start at nominal latency
          b) go back 30 ns in steps of 10 ns
          c) go forward 80 ns in steps of 10 ns at intermediate points
          d) continue an additional 100 ns in steps of ns

          starting with 0 at the nominal latency this wouldn yield the
          following sequence:

             0 -10 -20 -30
           -25 -15 -5 +5 +15 +25 +35 +45 +55
           +75 +95 +115 +135 +155


   Resource estimates:
   -------------------
   The total number of events for part I is 15.3 Million, for
   part II it is 7.2 Million. Assuming 1000 events per spill,
   this requires 22,500 good spills, or 378,000 sec up-time
   corresponding to about 13 shifts. Currently there are still
   22 complete shifts scheduled, i.e. if everythings goes
   smoothly, the foreseen program looks feasible, leaving
   even the possibility for some extra studies with the higher
   irradiated sensor or the GLAST ladder at the end. With
   a data volume of 15 kByte per event the required disk
   storage would be about 340 GB. With 500 GB per PC (plus
   two spare disks) this should be OK.


Miscellaneous tasks
-------------------

    > update documentation
    > update the run spread sheet for temperature readings
    > provide a list of phone numbers



minutes by Michael Schmelling