Minutes of the Aug 26, 2005 Tevatron Dept Meeting

1. Dept news: a) welcome Ryoichi Miyamoto of UT Austin! - he'll build TeV
AC dipole with Andreas as part of his PhD program; b) Vladimir reported
shutdown plans (decision to be made shortly after Sep 1) and his recent
trip to Russia.

2. Vahid on operations: there were 6 stores, Lumi btw 56-127e30, one ended
due to lightning glitch; typical lumi lifetime 8 hrs (OK), proton lifetime
130-140 hrs (not bad); pbar squeeze losses not as good as before (still -
only some 2-3%; experiments complained about background variations due to
slow orbit motion: it's of the order of 0.5-1 mm (p-p) in recent stores,
mostly horizontal - thought to be due to D0 quads (back in July motion was
mostly vertical due to CDF Hall temp changes).

3. Terry Anderson & Co noted that measured CDF column expansion (vertical,
due to temperature changes) is too small - about 1 micron - to explain 
significant LB quad motion measured by HLSs (5-10 microne per Jim Volk), and 
also contradicts the tilts measured by Todd's tiltmeters. So, they suggest not
blame the columns, equip cradles with more LVDTs and study the mechanics
of the LB quad drifts.

4. Bruce shared his experience with upgraded T121 closure application: Vic
Scarpine added STRUCK application to it that allows to close on coalesced
protons in presence of other bunches in the machine (McGinnis pbar closure
is in operation for long time) - the noise is about 40 microns, the system
tested in a recent store reduced inj oscillations from about 0.5 mm to
some 0.25 mm; some 10 MeV MI-Tev energy mismatch was observed. New T121
will be used routinely.

5. Ron tested new p-tune mults at EoS4346 - all right, leakage into pbar
tunes is small (10% or so); dQ'/dQ=5/0.005. Alvin reported incredible
-0.015 tune drift in a proton-only store last weekend (over some 1/2 hr).
The reason is not known yet (smth wrong in new Schottky).

6. Earlier today Sasha and Jerry changed the Tev optics to 28 cm beta* at
the end of the store, observed +5% in D0 and +3% in CDF luminosity,
scanned separators and alpha bumps, adjusted tunes (-0.005 H and -0.0025
V). After A17V separator control will be fixed, they'll try the change in
the middle of an HEP store (sometime next week).

7. Elliott informed that recently measured beta-functions at SL and FWs
have been incorporated into the P(A)V(H)EMIT database and can be made
effective by request.

8. Studies next week (prioritized): 28 cm beta*; new application to
stabilize orbit drifts; half-integer studies; crystal collimator at 980;
bunch of EoS's and minor studies.


Minutes recorded by V. Shiltsev; edited by R. Moore