Subject: Minutes of the Tev Dept Mtg, May 16, 2003 From: Vladimir Shiltsev Date: Fri, 16 May 2003 15:55:13 -0500 (CDT) 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, gollwitzer@fnal.gov, gromanov@fnal.gov, holmes@fnal.gov, khabibul@fnal.gov, marriner@fnal.gov, mhuening@fnal.gov, mokhov@fnal.gov, mont@fnal.gov, pasquin@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 (Vladimir): a) it's performance appraisal and goal setting time again; b) new Recycler Dept is created (to be led by Sergei Nagaitsev), Ioanis Kuorbanis is appointed the MI Dept Head 2. Jerry and Bruce summarized the week of the Tevatron: Lumi consistently over 40e30, well clustered (small spread), 3 out 5 best Run II stores this week, record proton intesities in several recent stores (latest - 250e9/bunch in #2551). Issues: "scallops" are back, coherent instability for short periods at 980 and after seq25, higher that usual pbar loss on ramp (due to beam-beam with more protons, e.g. 19% in #2551) led to somewhat smaller pbar efficiency (sligtly less than 60% overall - from 65% weeks ago, and 72% in the Tev vs 82% before); HE17 corrector tripped and killed one store (fixed); same with QA42 trim quad. 3. Ray Stefanski - who leads the Tev alignment task force - briefly overviewed what he wants to be done over the next 1/2 year: a) establish aligment network in the Tev tunnel thru HVAC penetrations (M.Church asked why 30 "site risers" are needed? why not 5 or 12? Ray will provide a quantitative answer); b) improve "fixture" (instrument for fast magnet roll maesurements); c) install 26 water level sensors in sector B during shutdown; d) improve datalogging/databases and data analysis. As for global realignment (including fixing "smart bolts") - very soon Ray will organize a review committee with charge to make recommendations on that subject. 4. Vladimir described what he called indication of "successfull Beam-Beam Compensation with TEL". The TEL was timed on one bunch (A33) in store 2540 and that slowered growth of the bunch vertical emittance (scallops). Conditions to claim "demonstration of the BBCompensation" a) have "bad" beam-beam effects (e.g. so far "scallops" occur not in every store); b) TEL to make things "better"; c) regularly (e.g. in two stores after #2540, the TEL produced either neutral or slightly negative effect). Major work is required on calibration of the TEL BPMs and bunch--by-bunch pbar tune measurement system (1.7GHz Schottky). 5. At the end of #2538, Bruce intentionally changed the tunes by +- 0.004 and - per Vladimir - the new 1.7 GHz Schottky has clearly indicated that. Tune (average for all pbar bunches) measurement error is about 7e-4 peak-to-peak (that's very good). Andreas will try to develop a simple way to determine tunes using the VSA and report the on-line results in ACNET.