Minutes of the Jan 11, 2008 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=1493

* News (Ron) - We await for details on how the lab layoffs and furloughs will
be implemented.  Rob Roser will be giving next week's Fermilab Colloquium
titled "The Tevatron and the CDF Experiment - A Year in Review"; I encourage
all to attend.

* Weekly Operations Summary (Dean Still) - It was a good week for the Tevatron;
over 40 pb^-1 were delivered to CDF and D0.  There were 7 stores with initial
luminosities between 183 and 259 ub^-1/s.  Two stores were terminated
unintentionally - store 5827 aborted after 18 hrs when the DQ0 tripped off
due to a faulty regulator; store 5832 was terminated by ops after 12 hrs when
the A1 wet engine tripped off and it was clear that a quench was inevitable.
Store 5835 had a record number of pbars to HEP, and the product of proton and
pbar intensities to HEP was also a record.  Items worked on this week: blowing
up pbar emittances, tweaking orbits in the squeeze to reduce losses at the
experiments, work on mechanism to insert a collimator during the squeeze,
separator scans to try to boost D0 luminosity (1% increase).  D0 requested
to move their IP positions to get it back into their desired region.

* E17 Pinger Timing (Dan Bollinger) - Dan brought the proton signal from the 
HE19 BPM to the E17 service building to help time in the E17 pinger more 
robustly. It is known that the trigger delay required for max kick voltage 
varies a lot with the kick amplitude.  Two hours of proton-only study are 
needed to map out the delay vs kick voltage at 150 and 980 GeV.

* Blowing up Pbar Emittances (C-Y Tan) - Tan and Jim Steimel tried blowing up
the pbars again in another end-of-store study.  After mistakenly kicking the
protons (without too much impact), they were able to increase the pbar
emittance at a rate of ~1.5 pi mm mrad/min as measured by the sync-light - 
about twice as fast as last time.  They are developing a remote control for the
system.  They still need to verify they are kicking at maximum with this
single amplifier.  When we try to blow-up the pbars before collisions, it would
be nice to have the IPM running to provide continuous emittance measurments
(before the sync-light mirrors are inserted).

* IPM Status (Andreas Jansson) - A problem with the trigger sync between two
buffer boards has been fixed.  The source of the data link sync loss problem
likely has been found; the fix is under study.  Some of our "wish-list" 
features are being implemented: automated data taking on event (working),
automated setup based on Tev state (like flying wires) is pending, but we can
use the Tev sequencer for now, and the data ready state device is waiting for
the state device to be defined.

* TEL-2 Status (Seva Kamerdzhiev) - For the first time since the shutdown, 
TEL-2 was used for a single-bunch (proton) beam-beam compensation study.  The 
electron beam position and angle settings for verified to be OK.  Good 
progress is being made on the new HV pulser.  They are ready to proceed with
in-store studies.

* CDF/D0 Luminosity Ratio (Alex Valishev) - After analyzing recent stores in 
more detail, it seems likely that the lower D0 luminosity is caused by 
dispersion in the D0 straight section.  The evolution of the ration during 
stores in not consistent with only differing beta* between the 2 IPs, but it
is consistent with identical beta* and a non-negligible dispersion.  Alex
did not try modeling a D' difference at the IPs.  The next step is to make
additional lattice measurements at low-beta.  (Already on our list.)

* Plans for Next Week

   - Deliver plenty of luminosity.
   - E17 pinger timing (Dan/Bruce, 2 hr proton-only)
   - Low Beta Lattice Measurements (Alex/Yuri/Eliana/Ryoichi, 4 hr proton-only)
   - Blow-Up Pbar Emittances (Tan/Jim, during HEP stores)
   - TEL BBC (Seva/Xiaolong, during HEP stores)
   - Adjust D0 IP (during an upcoming store)