Minutes of the Sep 14, 2007 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=1265

* News (Ron) - CDF will implement their diamond loss monitor abort capability
prior to start-up in October.

* Shutdown Status (Jim Volk) - C4 and D1 have been cooled to 80 K successfully.
Leaks were repaired on the E12-3 dipole and E12 spool package may need to
be replaced.  Additional vacuum investigation are still needed in A1, A2, and 
D3.  Over 100 magnets have been unrolled/aligned.  Cleaning of the ceramics
is complete.  Bake-out of the downstream half of C0 has begun; a procedure
for baking the MI dipoles in the upstream half has been prepared.

* New Squeeze Configuration I (Ron) - Ron showed a proposal for a new 
squeeze needed for the new collision helix.  It keeps 25 steps and the same
time length, but moves 2 now-redundant steps to the end to allow more
flexibility to transition to low-beta.  The injection-to-collision helix
feeddown change occurs in lattice 12 at LBSEQ 15.  Ron showed showed a couple
of "features" he found: the displayed durations for the physics group squeeze
ramps in the C49 application were meaningless and the "unsqueeze" is a
different length than the squeeze.  The first problem was fixed (get the 
durations from the low-beta controller that really determines the squeeze slot
lengths).

* New Squeeze Configuration II and New Helices (Alex Valishev) - Alex has been
developing new helices for the latter part of the squeeze.  He made the change
from injection to collision helix feeddowns later in the squeeze.  One problem
he identified is the transition from low-beta to collisions on the new helix -
we can no longer use a horz separator 2-bump at CDF.  Suggested ideas were
using a 3 or 4 bump, cogging, or just allow collisions at the end of the
squeeze without a separate time ramp we use now to start collisions.  Playing
a vertical separator 2-bump at CDF would require changing the vertical helix
in the short arc which may or may not be possible.