From - Tue Apr 15 11:58:34 2003 X-UIDL: 768-1035467889 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 Return-path: Received: from popserver1.fnal.gov (popserver1.fnal.gov [131.225.68.32]) by popserver1.fnal.gov (iPlanet Messaging Server 5.2 (built Feb 21 2002)) with SMTP id <0HDE000T69TKD7@popserver1.fnal.gov> for shiltsev@ims-ms-daemon (ORCPT shiltsev@popserver1.fnal.gov); Tue, 15 Apr 2003 11:58:32 -0500 (CDT) Received: from heffalump.fnal.gov ([131.225.9.20]) by popserver1.fnal.gov (NAVGW 2.5.2.9) with SMTP id M2003041511583226509 for ; Tue, 15 Apr 2003 11:58:32 -0500 Received: from bpmail.fnal.gov (waldo.fnal.gov [131.225.18.213]) by heffalump.fnal.gov (iPlanet Messaging Server 5.2 HotFix 1.10 (built Jan 23 2003)) with SMTP id <0HDE004NU9TKRI@heffalump.fnal.gov> for shiltsev@popserver1.fnal.gov; Tue, 15 Apr 2003 11:58:32 -0500 (CDT) Received: (qmail 6146 invoked from network); Tue, 15 Apr 2003 11:58:28 -0500 Received: from wally.fnal.gov (131.225.18.158) by waldo.fnal.gov with SMTP; Tue, 15 Apr 2003 11:58:28 -0500 Date: Tue, 15 Apr 2003 11:58:27 -0500 (CDT) From: Vladimir Shiltsev Subject: Minute sof Tev Dept Mtg, Apr 11, 2003 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 Message-id: MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII 1. Vladimir briefly overviewed budget of 14 most critical Tevatron projects. 2. Mike M summarized last 10 stores: 5 had lumi above 30e30, proton intensity was lower than before (some 6000e9 vs >7200e9) because of dampers problems (and larger losses at 150), in the last three stores (2400-2411) hor p and pbar emittances were somewhat (3pi) larger than before - reason is not understood yet. Trend (and efforts) to higher p/pbar intensities will be continued. 3. Andreas&Stephen measured dispersion at FWires and SLite, the only significant discrepancy found in SL (1.6m vs expected 1.2m). Pbar removal by F49 Vert collimator gave the same result as at the end of 2002: significant difference in reported emittances AV=37pi from SL, 29 from FWs and about 16 from scraping. Scraping results have uncertainties like 1D vs 2D scraping, extinction point determination and (mentioned by Valery) finite (short) beam lifitime due to diffusion when collimator is in the beam. With protons only in the Tev helix was closed and orbit displacement repoerted by FWs was found larger than expacted from Tev lattice model (some +5% in e11v, +10% in E17h). 4. Meiqin and Bela reported results of beam-beam studies: (there were 3 36x4 stores with two ramps) pbar lifetime is inversely proportional to some power(?) of number of protons (e.g. 2hrs at N_p=260e9/bunch and 6 hrs at 120e9), pbar loss on ramp - too (4.2% at N_p=155e9, 2.7% at 120e9). More analysis to follow. 5. Yuri and MikeM investigated beam aperture at F0 and - contrary to assumption - found it's quite tight both V and H. That calls for redesign of the "5-star" inj helix. Possibly, the aperture is limited by magnet nonlinearities. Yuri pointed again that beam stability seems to be dependent on position in RF cavities. Though that is not consistent with estimates of the RF cavity impedance, we asked Jim Crisp to perform Z measurement swith wires in the spare RF station. Also there was some discussion on why pbar orbit is not where we thought it is in F0 lambertson (farther from notch) and whether we should move lambertsons. Mike Church warned that the issue is more complicated as we have other types of beams (e,g,8 GeV) coming thru F0. 6. Vahid and Bruce attempted to ping beam verically and measure vert chromaticity - no success as the pinger pulse missed the proton bunch. Measurements with hor pinger were done, C_h extracted and found different by +3 units from the C_h measured by standard (dF_rf) technique. Investigating.