Minutes of the March 11, 2011 Tevatron Dept Meeting

https://indico.fnal.gov/conferenceDisplay.py?confId=4216

* News (Ron) - We were encouraged to proceed on more detailed planning for up
to 2 weeks of accelerator physics studies at the Tevatron.

* Operations Summary (Bruce Hanna) - There were only 3 HEP stores since last 
Friday's meeting before the shutdown that started Monday morning - initial 
luminosities ranged form 333 to 365 ub^-1/s.  Another shot was lost during
scraping when a longitudinal instability occured and caused high losses on the
collimators that had yet been retracted from the beam. Two recent quenches
during beam injection was found to be caused by a subtle problem in the timing
of events which trigger charging and firing of the abort kickers; the problem
should now be fixed, but we need to verify during start-up.

* Discussion about Shutdown Work (All) - Magnet roll measurements were
completed. There has been obivous changes since last measured/fixed in Oct
2010, but only several magnets are rolled more than our 1 mrad preference.
Two new multi-strip crystals were installed into the vertical crystal
collimator goniometer. Modifications to the pixel detectors were not totally
successful; only 3 of the 6 work. The E3 sump pump was repaired. Lots of 
cryo and vacuum maintenance occurred.  The PAK3 abort kicker has a new
thyratron and trigger circuit; a loose high-voltage connector on AAK1 was
repaired.  Fluorinert sight glasses on several separators were replaced.

* Start-up Plan - After turning, we will do some extended dry squeezes to help
get tunnel temperature back to normal and to test the abort kickers.  We will
see how much additional tune-up is needed after smoothing the orbits and
measuring tunes, coupling, etc.  Hopefully we can put in the first HEP store
by midnight, then return to normal cycles of HEP operation.