Minutes of Tev Dept Meeting 07/05/02 1. Bruce reported growing luminosity over recent stores (by Friday it was 15-17e30, over weekend we broke Run II record with 21.3e30). We are getting more pbars at flat top - originally thought to be due to better emittances but it does not look to be the only case for the last 2-3 stores (weekend). Seems that lifetime on pbar helix is better than on proton. New phenomena: a) emittances of pbar bunches 1+4xN are twice the usual emittances; b) emittances of proton bunches 1+12xM are somewhat larger; c) significant losses early in the squeeze. 2. Bruce/Tan reported on 0x12 store: a) pbar tunes are found somewhat higher than expected; b) Tan's tune meter reports the same V and H frequencies as Schottky detector. I expect a bit more of analysis on the studies from Tanaji when he's back. 3. Mike M. studied feedowns, smoothed orbits, found taht SQ should be changed by +0.06 A to get good coupling on both helices (that corresponds to 0.005 in tune split) its not clear why it helped, his MAD model agrees with orbits. Later with Yiuri and Bruce, it was found that angle bump at A0 doubles available vertical aperture (!? - does it mean that we messed up aperture by moving collimator out?) 4. Yuri analysed V and H turn-by-turn (TBT) data and was puzzled why after a lot of work on decoupling the data still showed significant coupling. Suggestions: next time try to apply smaller kick, look into many other BPMs. 5. Valery analyzed (the same) TBT data, found that many BPMs report identical data (by some mistake), taht some 2% of data points are missed in the records and that has to be carefully taken into account. He fit the data and found decoherence time is about 900 turns in bioth planes, he was able to find H and V tunes and their synchrotron sidebands with accuracy of dQ=0.0002 (as with Schottky!). There was some confusion nevertheless - hor BPM TBT data after hor kick do show higher amplitude at vertical tune line than in hor line (why? not clear yet). 6. Yuri observed proton lifetime on pbar helix of about 5 hours, while on proton helix it was only 2 hours. Schottky power is also -5dB (=less) on pbar helix. He suspects orbits in RF cavities (--> seems that pbar helix goes thru centers of RF cavities, and protons are far off-center). His estimates (from orbits) on dispersion at F0: D_x=0.7m on p-orbit, D_x=0.5m on pbar orbit. 7. Ron has measured amplitude of longitudinal oscillations of "dancing" uncoalesced bunches (30 bunches, 10e9/bunch, 150 GeV). No regularities seen, max amplitude exeeds 1 rad.