[Tpe] tpe meeting minutes

[andrei afanasev]

Larry,
Those 6% from Novosibirsk sound interesting. Note that the effect of standard "soft" TPE+brem in this kinematics give 3% asymmetry in their kinematics.
-Andrei

-----Original Message-----
From: Larry Weinstein <lweinste at odu.edu>
Date: Thu, 08 Apr 2010 14:27:18 
To: tpe<tpe at jlab.org>
Subject: [Tpe] tpe meeting minutes

Dear TPE folks,

Here is a summary of what we discussed at our meeting last Friday:
  1) Whether we should have 0.25" lead on the vacuum box or a hut around 
the box.
     - needs simulation.  Lead is a feasible solution.
  2) Engineered vs stacked chicane shielding.  Engineered is better but 
stacked worked well.  We will look into how to make the shielding more 
hermetic between the first Italian Dipole and the pair spectrometer.  
Rob will post  pictures of that area.
  3) Sparse fiber detector as a beam monitor.  This will be placed right 
before the downstream collimator, as it was in the test run.  We will 
simulate the background effects of placing it there to double check it 
is OK.
  4) Optimize Moller catcher geometry.  This was well studied by Megh.  
The current shape is good.  We do not need to adjust the jaw opening.
  5) calorimeter location.  Downstream of CLAS, probably on the catwalk 
between the forward carriage and the alcove.  The existing photon beam 
profiler will be placed on the front face of the calorimeter.
   - Valparaiso has already received the 30 Shashlik calorimeter modules 
and is starting to build the bases and order the PMTs.
  6) RadPhi wall collimator.  It was lead with a 2-cm brass insert 
during the test run.  We would like it to be 2-cm tungsten (preferably) 
or lead for the actual run.
  7) Are the TOF TDCs running in multi-hit mode?
  8) Novosibirsk finished their run in January at Q^2=1.5 and 
epsilon=0.4 (one data point).  They see a measurable effect (~6% from 
the online results).  This is pre-preliminary.

- Larry

-- 
				Sincerely,
				Larry

-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 5809 (fax)
weinstein at odu.edu
http://www.physics.odu.edu/~weinstei

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