Minutes of the Tevatron Department meeting May 17, 2002

1. Vladimir summarized AAC meeting comments: the committee members
appreciate our efforts and achievements, but point out that we are still
factor of 2 below intermediate goal of L=4e31 and good factor of 4 below
Run IIa goal of 8e31. They encourage us to redirect more resources into Run
II, continue involving the Beam Physics Department into beam studies, and more
manpower in diagnostics.

2. Jim Steimel informed us on the SBD meeting which concluded in a suggestion to
either use shorter cable to reduce pulse distortion or put the scope in
the tunnel (no cable at all). As for vacuum at the SBD - an experiment
is underway (Bruce and Terry Anderson) to determine outgasing from the SBD
microwave absorbers.

3. Bruce summarized the C0 Lambertson replacement meeting. There are two
options: #1 install B2 magnets + separate PS; #2 install MI magnets and
use Tev bus current to feed them. Option #2 promises more reliability
but is more challenging mechanically (MI magnets are much heavier).

4. Jerry gave an overview of Tev luminosity: in average it was good (1.6-1.8)e31
but there were many technical problems over the last two stores (separator
sparking, lost pbar transfer, etc). We do not use octupoles anymore at
150 Gev as it's too time consuming and not very reliable and sometimes might be
a reason for instabilities and losses. Luminosity lifetime is dropped from
15 hours to 10-12 hours - might be due to technical reasons.

5. Vladimir and XL did try to get more protons from MI with 9 bunch
coalescing in MI (usual number of bunches - 7). In general they did
reach the goal of 300e9 in the main bunch because of MI+Tev injection
problems.  They did adjust TEL beam position for the most effective cleaning at
150 GeV (now it takes only 2 min). Vladimir also noted that one of the
reasons for poor p-lifetime at 150 GeV might be momentum scraping (bunch length
goes down when helix is open).  Valery questioned why we did not diagnose
injection problems faster and lost some 2 full shifts of studies.

6. Jerry has measured tune drifts at 150 GeV (the phenomena we did not
have in Run I). Characteristic time scale 10-30 min. Tune drift is of
the order of 0.01 (negative for Q_x, positive for Q_y). Chromaticity has a bump:
C_h - bump up by 2 units after 209 min at 150 GeV, C_v down by 1 unit.

7. Yuri has tried for the first time "new - new" injection helix with
additional vertical separator. Results were quite encouraging for 36x12
store but there were no obvious improvement at the real store. We leave
the new helix and will continue to optimize it.

8. Aimin analyzed measurements done by Valery and Jerry and found that
orbit drifts after 1 hour at 150 are minimal (within the BPM errors -
it will be improved with more measurements). X-Y coupling is about 10%.
Theoretical model of the Tev lattice and orbit measurement with different
bumps agree within 10% (somewhat better in Y plane).