Minutes of the March 19 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=3211

* Weekly Operations Summary (CY Tan) - The Tevatron delivered 59.5 pb^-1 to
the experiments over the past 7 days.  There have been 9 HEP stores with 
initial luminosities between 246 and another new record 376 ub^-1/s.  Store
7670 aborted after only 2.5 hrs due to a power glitch at the F4 service
building.  Record store 7685 aborted after 19.7 hours when another power
glitch on Feeder 46 took out half of the cryogenic compressors.  The record
initial luminosity was helped by very little transverse pbar growth and no
longitudinal blow-up until after HEP was already declared.  The pbar bunch
length jumps are still occurring on nearly every store.  Enlarging the
separation helix early in the squeeze has helped reduce proton losses.  The
horz separation helix for collisions was increased 5% and that seems to have 
helped pbars.  TRF1 tripped off during 2 consecutives stores; no trips since
replacing the modulator.  We are investigating coupling early on the ramp.
Pbar tune measurements during HEP were made by exciting the pbars with the PBJ
noise source.

* Crystal Collimator Studies (Dean Still) - After some confusion about the 
crystal bend orientation, there was clear observation of channeled and
volume-reflected beam using the (vertical) multi-strip crystal during
end-of-store studies.  Analysis is ongoing, but the width of the
volume-reflected beam seems is about 2 times larger than expected.

* Optimizing Tevatron Luminosity (Alex Valishev) - As part of an exercise for
future Tevatron running, Alex revisited how we can increase luminosity.  The
most straightforward way is to increase proton intensity, assuming the 
emittances don't increase much - requires coalescing effort from Main Injector.
Smaller beta* limited by physical aperture in triplets, losing battle with
hour-glass factor.  Of course, more pbars faster would help, too, but many
folks already work on that all the time.  Alex proposed working on increasing
separation at nearest parasitic crossings (via optics adjustments) and trying
higher-intensity proton bunches as a study with a smaller stash store.

* Next Week's Plan (All)

   - Integrate luminosity.
   - Test BPM code for pbar TBT (controls, instrumentation during shot-setup)
   - Measure lattice at flattop, LBSEQ 14 (Alex, proton-only)
   - Aperture scans at B0, D0 (Bruce, proton-only)
   - 150 GeV Chromaticity (Tan, proton-only)
   - Pbar-only store (many folks)