Minutes of the April 6, 2007 Tevatron Dept Meeting

https://indico.fnal.gov/conferenceDisplay.py?confId=766

* News (Ron) - Last week's DOE Operations Review went very well for Run II.
Anyone wishing to attend the USPAS session in June needs to let me know soon.

* Operations Summary (Jerry Annala) - Only 24.4 pb^-1 was delivered this week
due to two lost stores and a > 12 hour CDF access.  There were 4 HEP stores
with inital luminosities between 196 and 243 ub^-1 s^-1.  Store 5315 aborted
after 11.5 hrs when the electrical safety system developed a ground fault;
the fault disappeared on its own during the investigation.  Store 5315 was
lost during scraping when the F3 bulk supply (powers trim dipoles) was turned
back on after it had tripped before scraping began - the resulting orbit
change caused beam to drift toward the collimators resulting in losses high
enough to quench.  Store 5321 was lost due to a quench from high proton losses 
at LBSEQ=17 during the squeeze.  We had been addressing losses there by making
small changes between stores and had planned a full-blown tune-up - this
quench forced us to work on it immediately.  Losses were reduced on the
subsequent (successful) shot.  When turning back on after store 5315, there was
a flashover in the B3 power supply busswork - the Tevatron was configured to
run on 5 supplies until the damage is repaired.  Ops prevented a quench when
they noticed the "next bunch" counter didn't increment while loading protons,
so they interrupted the injections; this problem occurs very infrequently, so
it's hard to diagnose.

* Brief Reports on Access Work - Here's a partial list of work done during
the long access for CDF...implemented remote power-cycling of the IPM
crates + installed 5 production DAQ boards...aligned the crystal collimator...
exercised the new power-supply switch for the E17 pinger to switch between
AC dipole and normal pinging...reterminated TEL-1 modulator screen HV cable...
as a follow-up to last week's failed electrical panel in the tunnel, FESS
inspected other panels for problems - one panel in A3 has water dripping on it
and another in A4 shows some corrosion inside.

* Independent Component Analysis of TBT Data (Alexey Petrenko) - Alexey 
showed results from analyzing ring-wide TBT BPM data using his ICA software.  
When using 6 modes, he can quickly and clearly extract the sine-like and 
cosine-like parts of the two betatron modes, the synchrotron motion, and even
a lower frequency motion that may be caused be magnet motion of some sort.  The
measured beta functions and phases agree very well with the measurements made
from the orbit response matrix method with similar resolutions.  The
application itself looks great, too - can easily display data from any BPM, 
enable/disable bad BPM from analysis, show FFTs of the various modes, display
the beta functions, etc.

* Plan for Next Week

   - Deliver plenty of luminosity to the experiments.
   - Continue commissioning of new sextupoles (Jerry, Alex - proton-only,
maybe try an HEP store?)
   - TEL-1 BBC (Seva, Xiaolong - during HEP)
   - P1 line matching with IPM (Andreas - proton-only, shot-setup)
   - Chromaticity tracker (Tan - proton-only)
   - AC Dipole (Ryoichi - proton-only)
   - E48 Bumper as Abort Gap Cleaner (Jim, Elmie - proton-only)