Minutes of the Feb 8, 2008 Tevatron Dept Meeting

http://indico.fnal.gov/conferenceDisplay.py?confId=1566

* Weekly Operations Summary (Bruce Hanna) - The Tevatron delivered 39.8 pb^-1
to the experiments this week.  There were 7 stores with initial luminosities
between 150 and 261 ub^-1/s.  One HEP shot was lost just before initiating
collisions as high proton losses exacerbated by very bright pbars and low
horz tune caused a quench @ B1.  The power leads for D0Q6 on the C47 spool were
replated to reduce the resistance.  The BPMs have still been changing modes
spontaneously - still no explanation.  Turbo stations at F13, E27, D47 have
failed.  The (new) BLM electronics at A1 were spuriously pulling the abort at
150 GeV - its abort input was jumpered.  We are developing a plan to start
implementing the new BLM electronics around the whole ring.  The low-beta
optics correction to reduce dispersion at D0 was tested at the end-of-store 
5887 and implemented for store 5891 - see more below.  Remote control of the
PBJ is now functional - we are trying to implement the pbar emittance growth
at flattop in a robust, operational manner.

* Implementing the New Low-Beta Optics (Alex Valishev and Jerry Annala) - 
Alex developed new optics to reduce the D* at D0 from 6.3 cm down to
(predicted) 2 cm while keeping the beta* and both experiments fixed.  While
testing the change at the end-of-store 5887, the tunes changed about as
expected (+0.022 horz, -0.037 vert).  Significant separator bumps had to be
implemented, too.  Overall, the CDF/D0 luminosity ratio improved from ~1.1 to 
~1.03.  The changes were implemented successfully for store 5891; the tunes
needed some adjustment and they will be propagated for the next store.  
Additional improvements may be had with alpha bumps and separator tweaks, but
we will wait for D0 to report their IP measurements (beta*, waist positions,
etc.)

* Longitudinal Oscillation Observation (Fedor Emanov) - Fedor is setting up a
fast scope with lots of memory to look longitudinal oscillations in the
proton and pbar bunches.  The scope can digitize an entire Tevatron turn (21
us) in a single acquisition and do it multiple times with a programmable delay.
When sampling a 4 GS/s, the scope can get the waveforms for all bunches 6500
times - plenty of resolution for looking at (coupled) oscillations in the 
53 MHz buckets.  He showed dipole and quadrupole oscillations for a single 
bunch. Fedor is trying to reduce trigger jitter ~200 ps and develop
the data-processing software.

* Plan for Next Week

   - Deliver quality luminosity.
   - AC Dipole Measurements (Ryoichi, proton-only and/or shot-setup)
   - HEP Tune Mult Calibration (Ron, end-of-store)
   - Additional E17 Pinger Timing Measurments (Dan, Bruce, proton-only)