Questions from the PAC to CDF
	April 12, 2002


0. We and the Technical Review committee were 
surprised that the suggestion to use the silicon 
edges for alignment was rejected. Please elaborate 
on your reasons. Explain your alignment requirements
and discuss the impact on triggering and tracking,
as well as manpower needs and throughput during 
construction.

1. Do you plan to present more detail of bottom line
physics implications for the upgrades? The committee 
is concerned that the basis for considering Stage 1 
approval at Aspen may not be in place without such
assessments.

2. What is your quantitative assessment of the 
limitations in the discovery potential due to the 
cosmic overlaps in the ecal.

3. The non silicon upgrades must be subjected to 
rigorous assessment of potential benefits versus
costs and risks. Do you plan to present most detailed 
information at Aspen as we move towards Stage 1 approval.
This applies especially to the ecal timing upgrade.

4. What specific mods are contemplated to improve the
speed of the L2 decision. To what extent is sufficient
info available to even make more sophisticated L2
decisions?

5. We want to understand the role of the tracking trigger.
provide a qualitative explanation of why the 3D tracking
trigger contributes significantly to high pt physics,
(for Aspen we would like a quantitative assessment of 
impact on Higgs sensitivity).