Minutes of the Feb 27, 2009 Tevatron Dept meeting http://indico.fnal.gov/conferenceDisplay.py?confId=2422 * News (Jerry) - A bit of news that was not mentioned at the meeting is that there will be Tornado drill next Tuesday in which the Accelerator division will be participating. * Weekly Summary (Tan).- There were 8 stores over the last week ranging in Luminosity from 277 to 336 e30. 6 of the stores were terminated intentionally, and there were two that aborted early. Much tuning was done during the week to improve efficiencies and emittance. The specific Luminosity is still down slightly from out peak performance. During the week, we lost a store due to the d0Q2 ciurcuit quenching and showing a ground fault during the trip. The fault went away in the process of tracking it down. Also, the Tevatron is still recovering from a power glitch to the Kautz Rd substation that took out half of the Tevatron compressors. During the week there were problems with sump pumps, vacuum pumps, and the two failures mentioned above. The integrated Luminosity for the week was 58.55 pb-1. Tan showed some data that Bruce collected showing the difference in correction dipole currents from December 6 until now. Most changes are consistent with normal orbit tuning and operaion. However, VC49 is different by 17 amps and this change is hard to reconsile with operations in the Tevatron. * Separator Calibration Check (Alex) - Page P163 has been modified to support a more automated way of checking out the strength of the individual separator curcuits (pos and neg treated as separate circuits). The process can now collect data in about 15 minutes. Off line analysis is still needed. The conclusion of the check this time is that all separators are healthy and giving the proper kick. * New TBT feature of the BLM system (Dean) - The new BLM system now is capable of showing losses on a TBT basis. There are three TBT bufferes in the BLM system. The abort buffer can only be viewed after an abort. The injection buffer should always be present and filled with the most recent injection data (Proton or Pbar injections). The studies buffer has not been commissioned yet, but by the end of the day it may be functional. Beam synch event $DA is used to trigger the studies TBT data collection. The TBT losses have already shown some extremely interesting data, including help with the diagnosis of the D0Q2 trip that happened this week. Dean also presented a theory about why the CDF luminosity increase when the collimators were withdrawn for studies recently. When the collimators were pulled back, the abort gap losses increased (as expected). This means that more Protons that are out of time from the Proton bunches are being lost at CDF. Some of these lost Protons could be in time with Pbar bunch debris in the Luminosity detector. This could artificially increase the Luminosity measurement with the collimators pulled back. This would not be an issue during normal operation with the collimators in. The increas in C:LOSTPB was also casued the by the collimator witdrawl, but not the reason for the Luminosity increase. * Plans for next week - Top priority is to recover from the power glitch and be ready for HEP. - Begin commissioning the bumper magnet as an abort gap cleaner. - Chromaticity tracker studies - Parasitically make IPM work both for PBJ feedback and P1 line matching. - Testing of the collimator insertion during the squeeze might also get some time if it is available.