Conclusions from the LHCb Silicon Tracker meeting
                     held on April 1st in Lausanne
           =================================================
               (notes taken by Ueli Straumann, April 12)

This summary contains a selection of the most important issues that
were discussed at the meeting, plus some additional information that
became available after the meeting.
 
Transparencies shown at the meeting are available at

               http://agenda.cern.ch/age?a041249

Project Schedule
================

 - The new layout of the IT box using thin cooling rods has been adopted as 
   baseline solution. The internal milestone for a decision on this was 
   April 1st.
 - Silicon Sensors:
    o The IT order has finally been accepted by CERN bureaucracy. Delivery 
      of the preseries is expected for autumn 2004 
    o TT sensors: delivery of 100 pre-series sensors from CMS is imminent, 
      the final order for the full batch is to be placed soon. A new offer 
      from Hamamatsu is available.
 - Beetle production is clearly critical. Present plans are: 
    o Production of equal numbers of 1.3 and 1.4 chips
    o Submission of engineering run by early May 
    o First chips to be tested by middle of August 
 - Hybrid production:
    o delivery of TT 4-chip prototype hybrids expected by mid April, 
      stuffing (by company) and testing will take approx. 3 weeks 
    o not yet clear when TT hybrid pre-series will be available
    o IT prototype hybrid will be ordered after reception of TT prototype; 
      delivery expected approx. 6 weeks later
    o IT hybrids from preseries production, using existing 1.3 chips, 
      will be available by end of August.  
  - IT and TT will need system tests, including final "5m" cable. When?

Money 
=====

 - The money matrix needs some re-shuffling (to be done by Ueli)
    o Try to get rid of CERN contribution to sensor costs 
      (to avoid tendering procedure)
    o Move cost for cooling equipment to CERN instead

Sensor Irradiation and Test Beam
================================

 - Irradiation of IT multi-geometry prototype sensors:
    o Use 27 GeV protons at CERN irradiation facility in May
      (after the meeting, the period was fixed to May 7 - May 12)
    o Irradiate sensors homogeneously to twice the maximum dose expected after 
      10 years in LHCb (irradiation of a final sensor, possibly inhomogenous, 
      is postponed to next year).
    o Michael Moll is our contact person at CERN.
    o Helge Voss + Stefan Koestner will set up (May 6) and follow up the 
      irradiation.
    o Cristina is responsible for sensor characterisation before and after 
      irradiation. A probe station at CERN has to be organised.
    o Helge will organize the assembly of a ladder from the irradiated sensor. 
      Hybrid and pitch adapter are available from HD
 - Testbeam:
    o The period from June 28 to July 12 has been reserved at X7.
    o Four ladders will be installed:
       - New TT prototype ladder with 3 CMS sensors and interconnect cable
         (Frank/Johannes to give ladder dimensions to HD)
       - Old CMS three-sensor ladder (for comparison)
       - New ladder from a single irradiated IT multi-geometry sensor
       - Old one-sensor IT ladder (for comparison)
    o The test beam will be organized by Michael.

HV/LV system 
============

 - Santiago confirm their responsability for the design and implementation of
   the systems
 - All aspects of the systems have to be coordinated with the responsible 
   person for the service box (i.e. Achim)

Cooling
=======

 - Since no responsible person could be identified, the responsability for 
   the cooling system remains with the two construction managers 
   (Helge and Frank)
 - A more detailed design proposal from CERN/ST became available after
   the meeting:
    o Material costs are within our budget (approx. 200 kCHF). CERN/ST 
      want to add manpower costs of the order of 80 to 130 kCHF. This is 
      clearly not part of the CORE costs and thus has to be funded outside 
      of the official money matrix.
    o The system design must be such that operating temperatures for IT 
      and TT can be set separately.

Manpower for Software
=====================

 - A total of approx. 2 FTE's is permanently required, Matt Needham provided
   the following breakdown for the coming year (Matt will cover digitisation 
   and DAQ):
    o IT geometry:                   0.5
    o TT geometry:                   0.5
    o digitisation:                  0.3
    o clustering:                    0.1
    o DAQ:                           0.3
    o alignment/general tracking:    0.3
 - Each institute will contribute with 0.5 FTE on a permanent basis; 
   group leaders will communicate to Ueli the name(s) of the people that 
   are going to work on software

Service boxes
=============

 - The location of service boxes for IT is not yet fixed; directly below 
   or above the IT detector boxes are probably the only possible choices 
   (cable length and radiation load)
 - The estimated board size of the digitizer board (one board per IT ladder)
   is 140 mm x 300 mm 
 - Additional space is required for cooling, cables (fiber brake-out part!), 
   removing of cards
 - An additional "crate controller" board will be needed for ECS etc.,
 - The suggestion to place low voltage regluators on the crate backplane 
   should be followed up (easier cooling etc.)
 - Responsibilities for the design and production of the Service Boxes 
   components have to be defined (coordination by Achim, Daniel and Pablo 
   will be involved).