May 30 PEP-N meeting summary


Dear all,
Here is the summary of the meeting of May 30,
all the best, Gianluigi.

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Snowmass. 
There will be 3 talks (1 on the detector and 2 on the physics)
about PEP-N experiment and probabliy they will be concentrated in the
session of July 7. There will also be a talk by M. Sullivan on the
accelerator aspects on July 6. 

Background. 
Simulations are being made assuming a 3cm radius beam pipe. A 2.5 cm mask
positioned 20 cm upstream of the Interaction Point is designed as a shield
from quadrupole synchrotron radiation. 
A background section will be added to the padova web page. 

Simulation. 
Mario and Matteo have reorganized and divided the Monte Carlo routines
GUKINE and UGEOM in order to semplify their structure. 

BGO crystal calorimeter. 
Paolo shows the note on the crystal calorimeter. The study is based on a
calorimeter made of BGO crystals with PMT readout and considering only
forward and barrel calorimeters. The poles are not considered for the
moment, but a difficulty could arise due to the maximum length of
crystals. 
With respect to lead-scifi solution, the BGO option offers the advantage
of an excellent energy resolution, but on the other hand a slightly poorer
position resolution is foreseen. The timing resolution will be
considerably worst with respect to scintillating fiber and the cost would
be roughly a factor 4 higher. See em-calorimeter section on the web page
for more details. 
Matteo will simulate the increasing of the energy resolution and the
decreasing of the position resolution to see the impact on particle
reconstruction. 

LOI 
D.Bettoni and M.Mandelkern have worked out a proposal for the organization
of the new Letter of Intent, with a first assignment of responsibilities
for the various sections and subsections. These are discussed in some
detail, and an updated version of the proposed new LOI can be found on our
web page.

AOB 
The PEP-N project has been presented by D.Bettoni to the INFN funding
committee (Commissione I). The presentation was preceded by a nice talk by
italian theorist P.Nason, who concentrated on the physics of R and the
impact PEP-N could make on both g-2 and the evolution of alpha_em to the Z
mass. Both talks can be found on the web page. The committee expects
another presentation at the september meeting. 

Next Meeting 
The next meeting will be on June 12 at 8:30 am.