Minutes of the 2 July 2010 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=3455

* Weekly Operations Summary (C-Y Tan) - The Tevatron delivered > 109 pb^-1 over
the past 2 weeks.  Over the month of June, we delivered 261 pb^-1 to CDF and D0
- our 3rd highest month ever.  We have now exceeded 2 fb^-1 for FY10 (since Oct
1) and already delivered more than our previous best year. (Congratulations 
to all!) There have been 19 HEP stores with initial lumiosities between 182 
and 357 ub^-1/s.  Only 2 stores were lost unintentionally - store 7926 was 
aborted when a yard breaker for the RF system tripped off, and store 7929 
aborted on high losses from a separator spark that kicked protons into a 
collimator.  Store 7932 was lost during the squeeze when high losses caused a 
quench of the CDF low-betas; the orbit angles through the IP were not good. 
There were a number of problems over the past 2 weeks.  The pbar injection 
kicker timing needed adjustment to eliminate mis-steering of the first bunch 
of each transfer.  A nearby lightning strike damaged a controller for the B48 
separator.  Occasional jumps in luminosity over a few stores were tracked down
to the polarity switch of the C49 vertical separator; internally there were 
open connections to the plates in the tunnel, so it was replaced.

* Low-Beta Lattice Measurement with Pbars (Alex Valishev) - This was the first
successful optics measurement using pbars!  Using the orbit response method
with 60 correctors, Alex measured the optics of the pbar helix low-beta lattice
used for collisions; he estimates 15% uncertainty on the beta function values 
(slightly worse than measurements with protons.) Compared to the proton helix,
there is significant beta beating in the vertical plane.  Differences in 
coupling seem to arise from the triplet quads, although there may be some in 
the arcs, too.  The beta* values are similar for both proton and pbar helices;
perhaps a little larger for the pbar vertical.  We expect such proton and pbar
lattice measurements to be helpful.

* Discussion on Plan for Next Week (All)

   - Deliver luminosity!
   - TEL-2 abort gap cleaning test (Xiaolong, end-of-store)
   - Longitudinal density studies (Tan, during shot-setup or proton-only)
   - TBT coupling measurments (Eliana, proton-only)
   - 3x3 store (Alex, Giulio)