Meeting of March 6, 2001

Present: Peter Bosted, Don Crabb, Keith Griffioen, Steve Rock, Piotr
         Decowski

1) Target. 
   a) Following up on last Wedensday discussion with Steve
   Williams, Don agreed to start working on a Target Project Document,
   containing Requirements, Design and Layout, Safety Aspects, and
   Preliminary Schedule. The Requirements should include things like
   power, gases, liquids, etc., as well as the Physics requirments
   (like high average nucleon polarization). 

   b) Frank Oneill has agreed to be Safety Officer for E160/E161.
   He would like copies  of E155x Target Safety Documents. Peter
   will get these from Ray and send to Don and Frank

   c) Don has found out from Oxford that they build to EC safety
   Standards. Need to find out if this will satisfy HEEK

   d) Discussed target length. 5 cm is what is good with Oxford
   magnet. We need to know fringe field of LASS dipole. Need less
   than 1 G/cm.

2) Steve asked Don to see what future office use U.Va would like
   (new building going up). Also, what facilities would like in new hotel
   that is being built.

3) Detectors:
   a) Peter found need 2 cm resolution in y, or better. This would be
   hard with tubes at each end of scintillator. So we will drop this
   idea. He found nice U planes in ESA from E155. Will check if
   dimensions are o.k. for us. He will check into other available
   scintillators
   b) Keith and Vahe will look into extruded versus cut/polished
   scintillator. Extruded being used at MINOS and STAR. Tradeoff
   betweeon cost, speed, and signal attenuation. 
   c) Keith talked to Vahe about their bases. Cost is about $200 each
   including the HV system. Steve found CAEN cost is $400/channel.
   We have about 300 channels currently: will need 900 unless share
   amoung PMTs (prefer not to). 
   d) Discussed if small (3/4" or 1" tube) can work effectively on
   scint. strips that are 3 cm wide. 
   e) Discussed need for flexibility: adjustable vertical separation
   between top/bottom, and room for absorbers between scint. layers
   to reduce cross talk.
   f) Keith has quote for about $75 each for scint. strips 1 by 2 by 
   100 cm, already cut and polished.

4) Electronics
   a) Steve wrote T.N. on TDC timing. Finds 0.5 nsec optimal tradeoff.
   for bin size (1 nsec is too big). On web now.
   b) Steve is studying effects of sprinkle hits on tracking, to 
   determine how hot we can run (hence how many bytes/spill).
   c) Keith mentioned Jlab is building their own VME TDC's (multihit).
   Perhaps we can use their design.

5) Simulations
   Piotr has got GEANT set up with uniform magnetic fields, alumina
   absorber, and detector planes. He is making ntubples to study
   J/psi mass resolution as function of field and alumina thickness.