Subject: Minutes of the Tev Dept Mtg, Mar 14, 2003 From: Vladimir Shiltsev Date: Mon, 17 Mar 2003 18:16:21 -0600 (CST) To: tevatron , annala@fnal.gov, bhanna@fnal.gov, bollinger@fnal.gov, cytan@fnal.gov, erdelyi@fnal.gov, garbincius@fnal.gov, jansson@fnal.gov, jwalton@fnal.gov, kipster@fnal.gov, koch@fnal.gov, martens@fnal.gov, mccormac@fnal.gov, meiqin@fnal.gov, pmivanov@fnal.gov, ranjbar@fnal.gov, rivetta@fnal.gov, ronmoore@fnal.gov, vs , stefanski@fnal.gov, steimel@fnal.gov, still@fnal.gov, tjohnson@fnal.gov, tsen@fnal.gov, val@fnal.gov, volk@fnal.gov, xiaoam@fnal.gov, zhangxl@fnal.gov CC: tevcc , balbekov@fnal.gov, burov@fnal.gov, cheung@fnal.gov, church@fnal.gov, drozhdin@fnal.gov, emclark@fnal.gov, finley@fnal.gov, frankz@fnal.gov, fritzd@fnal.gov, frs@fnal.gov, gena@fnal.gov, gromanov@fnal.gov, holmes@fnal.gov, khabibul@fnal.gov, marriner@fnal.gov, mhuening@fnal.gov, mokhov@fnal.gov, mont@fnal.gov, roger@Fnal.gov, scarpine@fnal.gov, slaughte@fnal.gov, spalding@fnal.gov, stephen@fnal.gov, syoon@fnal.gov, syphers@fnal.gov, vaia@fnal.gov, webber@fnal.gov 1. News: a) Vahid and XL will make poster presentations at the DoE review tuesday, Mar 18 WH15 6pm(?); b) new ALvin Tollerstrup award established - for the best postdoc work (hint for Aimin and Vahid); c) new Tev BPM specs finilized at the meeting last week; d) RayStefanski, Jim Volk and Co will install 20+ water level sensors on B-sector quads during next big shutddown to monitor vertical motion; e) the need of on-line Tev magnetic field measurements was discussed last week and corresponding request sent to the TD. 2. Stores summary (Jerry) : there were 3 stores before last Friday, two with Lumi above 30, one failed(18e30) because of pbar coalescing problems in MI, high proton losses at the beginning of the stores need to be fixed - ops tried to fix tunes and found better WP above diagonal, but it did not work in the next store. [over weekend, after the meeting, we set Tev luminosity record with 40.6e30 in store #2318] 3. Paul tried to use his tunefitter (software to determine tunes from Schottky spectra) to determine Tev coupling and got very encouraging results. Next steps: a) understand tune behavior better; b) make the procedure faster (<3 min, now 15min). MikeM values better precision of the min-tunesplit determination with the tunefitter. Vladimir suggested to start with chromaticity measurement instead because it can be done faster then what it takes ops do now. 4. Aimin and Vladimir independently looked into the numbers reported by the tunefitter - Aimin observed standard tune repulsion due to coupling and will analyze data further to understand errors in T55 page calibration (if any); Vladimit observed slow tune drifts in both X,Y of the order of 0.0001/hr over 16 hr store. 5. Valery finshed analysis of the differential orbit measurements data taken Feb28 (before A15 magnet replacement) - he found few more "bad" BPMs, reduced his previous estimate on beta-function variation from the model - from +-30% to +-15%, generated comparison table of betas and dispersions "measured" vs "model" (e.g. dispersion at E17 FWs found to be 4.8 m vs 6.3 in the MAD model). He also confirmed that there is uniformly distributed a1 of about 1.2e-4 in the Tev dipoles. Some fudging factors he introduced were questioned as well as the sign of a1 he introduced. Next step - do the same measurements+analyis now on p/pbar helices. 6. Mike Syphers was able to derive analytically 1.1e-4 skew quad component in the Tev dipole due to 6 mils smart bolt movement [in agreement with magn measurements and observations] 7. Peter and Vic Scarpine remeasured instability growth rates and found them factor of 3 smaller than before (with C0 Lambertsons). [After the meeting, the validity of their analysis has been questioned... so, they are seeking more studies.] 8. Vladimir analysed Tev bus current fluctuation spectra provided by Dan Wolff and concluded that at 35Hz fluctuations are dI/I=1e-7 that is equivalent to 2 microrad rms of the beam-to-RF phase noise - very minimal (compare with 10 microrad noise due to RF cavity microphonics). 9. Vladimir presented a list of possible EoS studies which can be done in the 2 weeks of "no time for dedicated studies". Yuri presented plan of work on Tev helices which contains 10 items and requires at least 6 dedicated study shifts by May 1.