From - Mon Jan 27 11:31:49 2003 X-UIDL: 395-1035467889 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 <0H9D00LVGV6QZY@popserver1.fnal.gov> for shiltsev@ims-ms-daemon (ORCPT shiltsev@popserver1.fnal.gov); Mon, 27 Jan 2003 11:28:02 -0600 (CST) 1. Vladimir informed about 1/2 day meeting devoted to possibilities of electron cooling in the Tevatron. It was found that in the most optimistic scenario we can not gain more than 10% in the Tev with E-cooling - thus, it has been decided not to pursue that idea anymore. 2. Jim Volk summarized shutdown progress: 80% of C0, 90% of CDf shielding and 75% of E17 Schottky projects are accomplished. E1 pinger moved by 1" where it should be. Magnet rolls in A,C,E sectors surveyed with Jostleins' instrument. >8 mrad rolls were found at A21-2,3,4, A16-3 so it was decided to replace rusted stands there. Tev cooldown should start next Wed. 3. Ray mentioned that CDF, C0 and E-17 alignment is going well, level runs going well (50% of the ring is done), Todd continues to make pictures of all magnet stands. Ray compared Jostlein roll results with recent survey in A-sector - survey rolls are factor of 2 less for those dangerously rolled magnets. Mike Church was surprized to see >3 mrad roll of A25-1 quad - it's unusually large roll. 4. a) Bruce said that 10 remaining new ion pumps were installed at F0. Now we are baking in may sectors; b) Andrei Chupira has shown results of water level monitoring of CDF low-beta quad sinking while stacking shielding bloks - it was very minimal, under 100 microns. Vladimir questioned why original prediction for the vertical quad which was 6 mm; c) Andreas and Dean confirmed that collimator motion is very well calibrated (1%); d) Jim S expects to be able to get useful information from new Schottky detectors ina week after getting the beam; f) Gennady Romanov and John Reid cfonfirmed that Rf phase noise is caused by mecahnical vibrations and water heater was found to be the major source of them. That was found with the test cavity, next week they will proceed with RF stations in the Tev tunnel. 5. Jean Slaughter reported that beam positions and angles at the IPs are available on-line, while there is hope that vertex distribution size vs Z will be available soon (spread of estimates from 1 wk to 3 mos). She mentioned "2 track" method which figures out experimental resolution. She showed once again that X and Y-waists are not at the same Z-locations (20-30 cm apart). Mike Martens thinks that bringing them back can give some 2% increase in Lumi. 6. Alvin made a nice analysis on longitudinal bucket dynamics on ramp: he found that due to movement toward unstable point only 4eVsec ellipse (out of 4.4eVSec of initial bucket area at 150) can go thru the Tev ramp. Nevertheless, that does not explain losses on the ramp as <1-2% of particles reside in those "to-be-shaved" 0.4eVsec. 7. Todd described observations on M7.8 earthquake in Mexico (Thu Jan 22, 20:20pm) - his tiltmeters were oscillating with 100 microrad amplitude p-p. It was as big as during recent Alaska earthquake - so, we'd quench if there is beam in the Tev. Water levels in MI-8 detected 4 micron ground motion. 8. Meiqin reported results of her numerical tracking of Dynamic Aperture vs dP/P: for protons on helix (machine non-linearities only) - DA=5.5 sigma for coalesced bunch and 7 sigma for uncoalesced, surprizingly independent on chromaticity; for pbars on pbar helix (with nonlinearities+beam-beam) DA=4 for coalesced, 5.5 for uncoal, there is slight dependence on chromaticity. Relationship between DA and beamlifetime is still unclear (Meiqin thinks it's like tau \propto 1/DA^4 - that's 3.6 time shorter lifetime for coal vs uncoal pbars). It was suggested to perform beam studies to correlate lifetime with DA and dP/P.