Minutes from the May 18, 2007 Tevatron Dept Meeting

https://indico.fnal.gov/conferenceDisplay.py?confId=835

* News (Ron) - Ron will be away until June 6; Jerry Annala will be acting 
Tevatron Dept Head.

* Weekly Operations Summary (Dean Still) - Only 27 pb^-1 was delivered this
week; lumi was down due to a 30 hr CDF access to investigate a cooling problem
for part of their silicon detector readout electronics and our limiting
intensities as we work on reducing losses after turning off the sextupole
elements to be used for the 2nd order chromaticity correction at low-beta.
There were 6 HEP stores with initial luminosities between 134 and 202 ub^-1/s,
all terminated intentionally.  Good progress has been made on reducing losses
with our new sextupole configuration; a new helix was implemented at 150 GeV
up through 200 GeV on the ramp, orbit changes around D0 have reduced 
losses on the ramp and early in the squeeze.  The D0 horz angle bumps need to 
be extended through the squeeze.  The HEP tune mults were calibrated at the end
of store 5421.  During the long CDF access, the polarity of the remaining
new sextupole elements were flipped, an as-found survey of the C4 separators
and low-beta quads showed no change since March 2006, and sandbags (10%
poly beads + 90% sand) were installed in the hole in the removable D0 shield
wall (C4 side) to help attenuate (proton) losses heading toward D0.

* First OTR Pictures of 150 GeV Pbars in A150 Line (Vic Scarpine) - Vic showed
profiles of pbars on their way to the Tevatron from the 2 OTR units in the A1
line (@ 902 and 903).  The OTR is generated by a 5 um aluminized mylar film.
The profiles are integrated over all 4 bunches in a single transfer. He's still
working on calibrations etc., but things look good.  The unit @ 903 may need 
greater magnification to get the profiles to cover more pixels.  There are
ACNET devices for reporting the profile amplitude, mean position, and sigma.
It's not clear how well we understand the optics for converting the beam size
to emittances.  Having a third unit in the line would allow independent
optics measurements to be made.

* Report from CERN Trip and IPM Status (Andreas Jansson) - Andreas recently
went to CERN to help install the LHC 4.7 GHz Schottky pickups and electronics 
designed by Ralph Pasquinelli and his team.  Installation was successful. The
LAFS group will port the software we use for extracting tune measurements from
our 1.7 GHz Schottky system.  The LHC folks build an AC dipole system like the
one we have.  The horz IPM is now instrumented with 10 new DAQ boards, so that
should be enough to begin the turn-by-turn measurements for matching the Tev
and transfer line lattice.

* Plan for Next Week 

   - Deliver quality luminosity to CDF and D0.
   - Continue improvements after implementing the new sextupole configuration.
   - Low-beta optics measurements with the new sextupole circuits ON
   - TEL-1 beam-beam studies during HEP
   - AC dipole measurements (Ryoichi, proton-only)
   - Chromaticity Tracker studies (Tan, proton-only)
   - Crystal collimator (Dean, end-of-HEP)
   - ...