Minutes of the 18 January 2008 Tevatron Dept Meeting http://indico.fnal.gov/conferenceDisplay.py?confId=1507 * Weekly Operations Summary (Dean Still) - The Tevatron delivered over 38 pb^-1 to the experiments this week. There were 6 HEP stores with initial luminosities between 193 and 275 ub^-1/s. One HEP shot was lost during the squeeze as a result of high proton losses exacerbated by the unintentionally "brightest" pbars we have ever seen. A tune-up of the squeeze was done while waiting for enough pbars for the subsequent HEP shot. There were only several minor hardware failures this week (VC43 regulator, 2 RF station trips, D17V separator spark). The whimsically-named PBJ was used to intentionallly blow-up the pbar emittances shortly after store 5852 began. (Initial luminosity 275 ub^-1/s - a top 10 store). Pbar emittances were increased ~1 pi - the instantaneous luminosity dropped by 3%, but the proton and luminosity lifetimes were increased. It looks like this store may end up with the best integrated luminosity for the (eventual) store duration. Work on using the PBJ will continue. * Luminous Lifetime Fraction Devices (Ron) - Ron described new ACNET devices (C:PLIRAT, C:ALIRAT, C:LLIRAT) which provide the ratios of the various measured lifetimes (for protons, pbars and luminosity, respectively) to those expected from beam burn-up in luminosity alone. They can be useful to the see the effects of tune changes or other events during stores. A new plot showing those devices over an entire store is now placed into the Shot Scrapbook. * CDF/D0 Luminosity Ratio (Alex Valishev) - Alex extended his analysis by included the effects of dispersion' (prime) and a crossing angle, but there is still no obvious explanation. The luminosity ratio evolution over a store is inconsistent with a simple beta* difference alone. The luminosity ratio changes seen after RF station trips (bunch length growth) is inconsistent with a significant dispersion value alone. One can see better agreement in the ratio by adding an 80 urad crossing angle (very large) at CDF, but that is inconsistent with the successful modeling of the CDF lumnosity itself. Next, Alex will attempt to include dynamic beta* changes caused by the large beam-beam effects at the starts of stores. * Plan for next week - Deliver luminosity. - E17 pinger timing (Dan & Bruce, 2 hr proton-only) - Low-Beta Optics Measurements (Alex, 4 hr proton-only) - TEL-2 BBC (Seva, during HEP stores) - PBJ studies (Tan, Steimel, some no-beam time) - AC Dipole (Ryoichi/Andreas, proton-only)