Minutes of the Dec 4, 2009 Tevatron Dept Meeting http://indico.fnal.gov/conferenceDisplay.py?confId=2933 * Weekly Operations Summary (Dean Still) - There have been 20 stores over the past 2 weeks (including Thanksgiving holiday) with initial luminosities between 90 and 290 ub^-1/s. The Tevatron delivered 81 pb^-1 over that 14 day period. Several stores had rather low luminosity due to smaller pbar stashes while Recycler electron cooling was unavailable. Two stores were lost prematurely - 7373 aborted on vacuum controls when a cryostat valve solenoid ground-faulted; store 7407 quenched at A3 due to cryo vacuum - known leak is there. Two shots were lost during the squeeze: 7376 (pbar emittances much larger due to no electron cooling),7386 (particulary bad orbits due to D0 low-beta quad rolling). Proton losses at D0 during the squeeze are improved after the A18 quad/spool alignment and subsequent orbit bumps. There has been much effort to understand and reduce pbar emittances: since the incoming pbar emittances have been larger due to the Recycler vacuum degradation, we have reduced the intentional blow-up at flattop; additional work on tunes and coupling continues to control a blow-up after initating collisions; pbar collimator insertion has been modified to allow them to reach their desired positions. Longitudinal pbar instabilites continue to annoy us. The low-beta lattice was measured; data being analyzed. Calibration of our HEP tune mults was attempted, but noisy reading from the 1.7 GHz Schottky pbar channels inhibited most of the study. * IPM Update (Andreas Jansson) - Andreas summarized recent improvements and bug fixes. The fluctuations in the beam size readings are gone, and they understand the correlations between reported beam size and signal intensity. We are now getting good data on pbar beam size during the intentional blow-up at flattop. Now they can fine-tune configurations for various states/modes and redo some previous studies. They also need to attack some hardware problems in the DAQ for the horizontal system. * T-980 Crystal Collimator Study (Dean Still) - Dean reported on this week's study. They made a second demonstration of channeling with the new O-shaped crystal in the horizontal goniometer. Beam undergoing "volume reflection" from the crystal was likely observed at a downstream for the first time. Tests of an O-shaped crystal and a multi-strip crystal in the vertical goniometer await additional development in the motion controls software. * Plans for Next Week (All) - Deliver luminosity. - TEL-2 BPM Calibration (Alex, Giulio, End-of-Store) - Tune Mult Calibration (Ron, End-of-Store) - Orbit Bumps at Feeddown Locations (End-of-Store)