Minutes of the April 30, 2010 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=3317

* Weekly Operations Summary (Jerry Annala) - The Tevatron delivered 72 pb-1 
during the week with 10 successful stores.  The peak Luminosities ranged from 
294 e30 to 391 e30.  There were very few operational problems during the week.
DQ0 developed a ground fault that ended one store.  Melting an ice ball on 
the power leads was the corrective action taken, and all other stores ended 
intentionally.  The LLRF system needed experts to trouble shoot problems 
related to reboot procedures, but there was little other downtime incurred.  
The 150 GeV lifetime was low for about 3 stores between orbit smooths, but was
back to normal by the end of the week.

* Independent Component Analysis of Tevatron Lattice (Kseniya Astrelina) -
ICA is used to separate spacial and temporal components in turn-by-turn BPM
data. That promises much better accuracy for beam motion amplitudes and
phases relative to what can be achieved with Fourier transform, and,
consequently, better accuracy of lattice measurements.  Relative to LOCO,
which is the base of our present optics measurements, the turn-by--turn
optics measurements are much faster. That creates many advantages including
the possibility of accurate optics measurements on the ramp. Difficulties
include selecting the proper algorithms to separate signals as different
algorithms converge to slightly different results.  The work was aimed to
building a numerical algorithm to select a proper ICA method. This work is
almost completed. Next step will be aimed to building a machine optics from
the measurements. The optics obtained this way needs to be crosschecked with
LOCO. That will require simultaneous data acquisition for LOCO and
turn-by-turn in the near future

* Plan for Next Week (All)

   - Integrate luminosity. 
   - Aperture scans at B0 and D0. (Bruce, Alex, proton-only)
   - Chromaticity measurements at 150 GeV (Tan, proton-only)