Presents: G. Gavalian, D. Hayes, M. Mazouz, C. Ferdi; A. Chantelauze, A.
Camsonne, P. Bertin, F. Sabatie, R. Gilman

  Minutes:

  -- M. Mazouz: showed pictures of the tagger fully assembled in Grenoble.
It will be sent to Jlab before this weekend and will be here next week.
Malek also talked about MC results for the tagger. New simulation with new
mechanical description of tagger system shows that rates are everywhere
less than 1MHz at 4MeV threshold except for one paddle. Malek suspects
that positionning of side plates creates an unrealistic top-bottom
asymmetry and will investigate this. Malek also showed results
of MC wrt what paddles are hit when a certain proton array block is hit
(by a proton). He will put this into correspondance table so that it can
be used in the trigger if necessary, or for quick offline analysis.

  -- Astrid: showed updated results on the LED monitoring. Removing one of
the collimator's plate increases the number of photoelectrons by a factor
10. A new light guide is currently under fabrication, which should improve
light collection and maybe allow one to use better collimator (with 2
plates). Cross-talk, which was a problem in the first system studied last
year, seems to be completely gone now (good news!). PMT linearity was
studied as well. Comparing the mean of the integral for two LEDs and then
for the sum of the two, linearity was determined to be of order 1.4%. This
result was however not recovered when comparing photo-electron yields.
This remains to be understood. Lastly, Z-dependence was checked to be of
the order 1% per mm, which is okay to work with since the estimated z
spread of blocks on the face of calorimeter should be within these specs.

  -- David: Cabling of trigger and ARS just started for Proton-Array and
Tagger. Should be finished next week.

  -- Gagik: aggreed to check on the spectrometer setting for check-out so
that we can send a complete setting to Ed Folts asap. He will also check
the mounting of external paddles for cosmics with the proton array.