Minutes of the Tevatron Dept Meeting - Sep 5 2008

http://indico.fnal.gov/conferenceDisplay.py?confId=2025

* Weekly Operations Summary (Dean Still) - The Tevatron delivered 59.9 pb^-1
to CDF and D0 over the past 7 days.  There have been 9 HEP stores with initial
luminosities between 224 and 300 ub^-1/s.  Only 1 store was lost
unintentionally - store 6393 ended in a B0 low-beta quench when the B0Q6 
power supply tripped off.  This failure mode has been happening infrequently
for a couple of years; EE Support disabled an unused status bit in the latest
attempt to solve the problem.  There was another no-beam B0Q3 quench when
ramping after recovery from the 6393 quench; experts are investigating if
the heater firing unit tests are exacerbating the problem.  The MDAT beam
intensity broadcast for the F49 collimator was not working for ~4 stores.  The
E4 BPMs had a front-end problem requiring a reboot to fix.  The 150 GeV
proton lifetime problem improved after making an orbit bump to move away
from the aperture at C49.  CDF has been receiving integrated dose alarms during
the squeeze; we are implementing several orbit bumps to try to reduce the loss
spikes.  There is still evidence of an occasional timing problem with the
pbar injection kicker.

* Measuring Longitudinal Damping Time (Fedor Emanov) - Fedor and Tan looked
at the longitudinal damping of a single coalesced proton bunch at 150 GeV.
Using Fedor's fast oscilloscope system, the synchrotron frequency peaks were
obvious.  The longitudinal damper works on the order of ~15 sec.
Surprisingly, it damps quadrupole mode in addition to the dipole mode.  Next
they will make observations when anti-damping.

* Plan for Next Week

   - Deliver quality luminosity.
   - Longitudinal damping measurements (Tan, Fedor - proton-only or shot-setup)
   - Bumper magnet as abort gap cleaner (Bruce, Jim - proton-only)
   - Multi-bunch proton injection (Tev and MI personnel - proton-only)
   - Crystal collimator check-out (Dean, proton-only or end-of-store)
   - Chromaticity Tracker (Tan, proton-only)