Minutes of the June 11, 2010 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=3415

* News (Ron) - This year's performance review process is about to begin.  I
will distribute links to forms later.

* Weekly Operations Summary (Andreas Jansson) - The Tevatron delivered 
68.4 pb^-1 to the experiments over the past week.  There have been 10 HEP 
stores with nice, consistent initial luminosities between 330 and 370 ub^-1/s.
All stores have been terminated intentionally.  Since raising the RF voltages 
back up to near pre-shutdown values, the longitudinal pbar blow-ups have been 
reduced significantly, if they occur at all during stores.  Pbar injection 
closure has had shot-to-shot variations recently; it's not clear if there is a
vayring power supply in the line or something else.  Studies completed include
crystal collimator, B0 aperture scans, lattice measurements, rephasing of
tune and chromaticity trackers after a LLRF reboot.

* RF Phase Shaking (Alexey Burov) - Alexey has been studying longitudinal
instabilities; theory indicates that a flatter phase distribution for small
amplitudes may be beneficial.  He proposed modulating the RF phase at a
frequency close to the synchrotron frequency of the small amplitude particles
in a bunch in order to modify the distribution.  Tan successfully tested a 
set-up of the existing chromaticity tracking harware in preparation of an 
experiment: phase-modulating the beam at 87.5 Hz at an amplitude of ~4.5 deg.
The SBD can be used to obtain the longitudinal beam profiles during the actual
experiment.

* IPAC Highlights (Alex Valishev) - Alex summarized his personal favorite
presentations from IPAC including topics from LHC commissiong, wire-based
long-range beam-beam compensation at RHIC, plans for SuperB factory in Italy,
successful use of 10-pole and 12-pole correctors at RHIC, many studies
exploiting turn-by-turn analyses, and Hirata's talk on social aspects of
accelerators in Japan.

* Plan for next week

   - Continue smooth delivery of luminosity.
   - RF phase shaking (Tan, Alexey - proton-only)
   - 3x3 TEL study (Alex et al.)
   - Pbar-only store for pre-shutdown documentation (all)