Minutes of the Oct 9, 2009 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=2830

* Weekly Operations Summary (Xiaolong Zhang) - The Tevatron delivered
> 45 pb^-1 to CDF and D0 from Friday-Friday.  There were 8 stores with initial
luminosities between 208 and 249 ub^-1/s.  All stores were terminated
intentionally.  In store 7243, one of the B48 separator power supplies failed;
we were able to compensate partially using the other supply, but luminosity
was a bit lower for the rest of that store until the failed supply was
replaced.  One shot was lost at flattop before the squeeze due to bad cryo
vacuum causing a quench; a turbo pump was added to improve the vacuum at F12.
The protons have been blowing-up longitudinally during a number of
recent stores at different points in the cycle; the orbits through the cavities
appears nominal and the longitudinal dampers are functioning properly, so the
investigation continues.  Some progress has been on the proton lifetime at 150
GeV and beam losses early in the ramp.  Orbit and tuning work continues on 
reducing proton losses during the squeeze especially at LBSEQ=15 where the 
beam-beam effects are bad due to the reduced separation for the helix flip.

* Resolving the BPM Problems (Luciano Piccoli) - Luciano gave a brief overview
of the issues.  1) Crashes in turn-by-turn mode: not reproducible in teststand,
small differences in compiler flags between front code and linked libraries,
could reoccur although seemingly running OK for now. 2) Crashing after reboot:
reproducible on teststand, occurs with heavy backplane loading.  3) A new one
to be debugged: not taking data for the new simultaneous forward & reverse 
injection closure scheme.

* Attempted P1 Line Matching (Alex Valishev) - Changes put in for store 7247.
The proton emittances was larger throughout the whole cycle, so it was no 
help, likely even worse.  Need full set of measurements in MI, P1 and Tevatron.
Having Tevatron IPM turn-by-turn data would helpful to look for oscillations.
Repeating the "round-trip" measurments (MI-P1-Tev-A1-MI) would also be good.

* Plan for Next Week

   - Deliver luminosity.
   - Work on losses throughout the cycle.
   - Tune mult calibration (Ron, end-of-store, up to 2 hours)
   - TEL-2 e-beam alignment (Xiaolong et al., proton-only 1-4 hours)
   - P1 line studies (Alex, Ming-Jen, proton-only)