Minutes of the Aug 15, 2003 Tevatron Dept Meeting

1. news - Tev Alignment review is over, nice report delivered, thanks to
Ray and Peter Garbincius for organizational efforts.

2. Bruce on Tev stores: record luminosity 49e30 in store #2887 last
Sunday, record N_pbar = 1010e9 in the same store, since store #2979 we have
raised RF voltage and it helps to reduce losses on ramp but makes losses
in squeeze higher, early last week we had problems with losses at B11 in
seq12-18 of the squeeze - they seem to be related to higher vert orbit
position at B11, correctors around that area are already saturated plus we
see some 20 urad continuous pitching of Q3 quad, reliability problems
with RF have not gone after longitudinal damper was disconnected, proton
lifetime at the beginning of stores is worse than 4-6 week ago - as
the result CDF is often afraid to turn on the SVX at the beginning of
store when LOSTP>25kHz (ops found that coupling and vert chromaticity are
of some help).

3. Jerry reports that proton BLT is ready to try (though yet slow and can
be used for every other proton transfer), beam phase detector also works
but is not calibrated yet.

3. Tan compared recent measurements of the chromaticities in squeeze and
at LB with old ones - differences are within 1-5 units. Vladimir mentioned
that while measured chromaticities at LB are about 20 in both planes, new
Schottky reports 20H and 13V for both beams. He used page W101 for fast
Schottky measmnt's and observes that all spectra are OK and fit quality
is good except for Hor P spectrum. W101 reports that pbar Q_x > Q_y that is
opposite to what we had in May.

4. Yuri looked into octupole rewiring scheme proposed by Peter and found
it's OK, except vert diff chromaticity circuit will be weak. Jerry
mentioned that there is a number of octupoles which are not connected to
PSs and, thus, "invisible" - Peter will explore whether those can be wired
and used for the purposes of diff chromaticity correction or introduction
of tune spread. Yuri also requested installation of a 50 T/m normal
sextupole at A0 (next to dump) for a better control of differential
coupling (+ to reduce S6 current).

5. Valery and Peter did lattice measurements with closed orbit bumps, they
see that reduction of S6 current led to reduction of corresponding lattice
imperfections. Valery is also finishing plan how to make Tev
lattice ideal at injection and potentially reduce emittance blowup at
injection.

6. Vladimir looked into remarkable events on the Tev ramp : synchrotron
frequency crosses 60Hz at 340 Hz, separators saturated at 500 GeV, dE/dt
maximizes at 16 GeV/s between 500 and 600 GeV.  A " knee " in pbar
intensity occurs at 500 GeV.


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