Dear TPC friends,

    Here is the summary of our last meeting (#17).  Let me know if I
forgot something.
    The next WP meeting (#18) will be on Wednesday 10.1.2007 at the usual 
time (WC06.30, EC09.30, CET15.30, JST23.30). This will be 
a normal WP meeting and not yet the dedicated electronics meeting we 
talked about at last time (see summary below), because it turns out some 
electronics people will not yet be available this Wednesday.  I will be
sending a separate announcement about WP#18...

     HNY,
             Ron

            Summary 17th WP meeting 20/12/2006
           --------------------------------------------
Present:
-Ties Behnke
-Paul Colas
-Madhu Dixit
-Keisuke Fujii
-Lea Hallermann
-Katsumasa Ikematsu
-Leif Joensson
-Dean Karlen
-Martin Killenberg
-Vincent Lepeltier
-Dan Peterson
-Lee Sawyer
-Peter Schade
-Ron Settles
-Akira Sugiyama
-Jan Timmermans
...anyone forgotten?

 Agenda and Summary:
--------------------
   1. News
         -a. Beijing tracking review status.
Further iterations since this meeting have resulted in the following 
suggestion: five talks in the open session of ca.20+5min each.  
The reason for five is to give all regions visibility, to have all 
technologies represented and to split up the work.  In the open
session there will be one overview talk and four talks on the different 
R&D directions and planning.  As soon as we have converged on the contents 
of the talks and the speakers, everyone will be informed of course. 
In the closed session we decided to give no talk, but only to present our 
money/manpower information available at that time.
         -b.  PCMAG which arrived at Desy a couple of weeks
ago has now been commissioned.
   2. WP meeting
         -a. Date for a meeting on the evolution in number electronic
             channels for LP?
Leif would like a dedicated discussion on the number of electronic
channels for the LP.  As a reminder, Eudet foresees 2000 by the end
of 2007, while many of us think around 10000 will be necessary to 
carry out the LP R&D program.  This has several implications,
e.g. where/how to instrument the endplate pads, what is necessary
for the DAQ to inplement this number which goes beyond the
Eudet plans, and so on.  At first we thought to have this discussion 
during the next WP meeting on 10 January, but now it turns out
that 2 weeks later will be better.  
         -b. LP1: FC status (Peter Schade et al), 
             see http://www.desy.de/~pschade/Fieldcage-status.pdf:
Peter gave the status.  Some dimensions are changing and
need clarification.  For example, is the space forseen for the
silicon layers between the TPC and the magnet inner bore
sufficient?  Are the other dimensions acceptable?  
Present thinking is mount on a mandrel, to wrap the fieldcage rings
on first and then the support structure (honeycomb, mylar, etc),
and then collapse the mandrel in order to remove it.
Then the discussion evolved to the related point:
         -c. LP1: Dan has a new iteration on the LP1 endplate at
http://w4.lns.cornell.edu/~dpp/linear_collider/LargePrototype.html
The points discussed were:
--What is our final decision for the gate offset? 
--The 2mm gap between edge of endplate and fieldcage is 
  thought to be enough since the panels will not be mounted 
  in situ (at least at the beginning).
--The thickness of the fieldcage should be 20mm (not 40mm);
  the endplate diameter must match the final fieldcage diameter.
--We also have to agree on the shape of the light-red flange in
  Dan's drawing.
--Do we want a continuous guardring (skirt)?
--What is the 'radial gap' between the panels? 2cm?
   (The 'azimuthal' gap should be as small as possible.)
--Where are the pixel detectors to be located, in a special
   slot or in one of the panels?  Ties, Ron favor one of the 
   panels while Paul favors a special slot. (During the 
   Project-List discussion for the LP at Valencia, see 
   http://www.mppmu.mpg.de/~settles/tpc/lp/wpmtg/Project_List4_LP_TPC.doc 
   this point was left open.)  The pixel groups should also
   decide on the size.   
--Dan asked about the electrostatics between fieldcage
   and endplate; Ties answered that simulations are on-going.
--There was general agreement that we try to finalize all
   dimensions and tolerances of the fieldcage and the 
   endplate by the end of January.

3. AOB
         -a. Send in your favorite LCTPC logo!