Minutes of the Aug 7, 2009 Tevatron Dept. Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=2739

* News (Ron) - Reminder: AD monthly employees will start using the electronic
effort reporting system (FTL) the week of Aug 31.

* Shutdown Status (Jim Volk) - A1, A2, A3 currently warm.  D1 warming up.
E3 and F1 ready for cooldown.  E1 still to address.  5/8 bad magnet stands
have been replaced.  Outside air leak to beam tube found on A24 BPM 
feedthrough.  Vertical cystal collimator is being baked (upstairs).  E17 flying
wire repair underway.  CDF low-beta quad alignment amy only be the Q5 and Q6,
not the triplets.  QBS work at F46 still to be done.

* P1 Lattice Functions (Ming-Jen Yang) - MJY showed his results from a study
done before the shutdown (3-bumps through MI extraction lambertson to Tev).
The orbits are consistent with the expected quad strengths, and the dispersion
function is consistent with the model.  Based on the beam sigmas measured
by multiwires in the line, it seems there is a large horizontal beta function
mismatch (and a smaller vertical mismatch).  The lattice function at MI 501
needed to fit the beam sigmas disagrees with the TBT MI lattice measurement.
Ming-Jen will continue to identify a possible source of mismatch in the MI,
although he and Alex will develop P1 changes to try to correct the mismatch.
Both the MI and Tevatron will need to make new lattice measurements during
start-up.

* Dry/Wet Squeezes after Collision Hall Access (Cons Gattuso) - Cons and Mary
have been thinking about how to make turn-on after collision hall acceses
more efficient.  It should be possible to simply ramp down the low-beta quads
(and not the Tevatron proper), access, ramp up the low-beta quads, ramp
the entire machine down and then go straight into the subsequent HEP
shot-setup.  This could eliminate the usual dry and wet squeezes, save time
and avoid complications from b2 drift compensation in the dipoles for short
flattop times.  Cryo thinks it is possible.  Tevatron folks will think about
and work on sequencer aggregates for this scenario; any testing will occur 
after we return to normal operations following the shutdown.