Minutes of Friday March 21, 2003 Tevatron department meeting.



Magnetic measurement meeeting with TD - Mike M
     M. Martens, V. Shiltsev, V. Lebedev met with P. Bauer, B. Kephart
P. Schlabach, M. Lamm from the Technical Division to disscuss the
possibility of an online magnetic multipole monitor. Members of TD think
it is a lot lot of effort to such a system running. It would also have
limited up time due to LHC magnet testing and limitations on the MTF
cryo facility. Tev group would still like to have such a system. They
will continue to make magnet measurements, but no conclusion was reached
with regard to the online magnet measurement system.

A0 modification considered by BPD - Tanaji/MSyphers
     At a meeting to discuss A0 lattice modifications there was general
agreement that while it would be nice (and proper) to have the A0 optics
reverted back to the old "Collins Straight Section" style, there are no
compelling reasons at the moment forcing us to do it ASAP. Also, John
Johnstone has a nice helical orbit process -- from 150 to 980 to
collisions -- that looks very promising, using all separators along the
way. Tanaji also stated that more work can be done on the theoretical
aspects of beam-beam and the helix.


Tev stores summary - MikeM
    Stores have been looking good this past week including a new record
40.75E30 initial luminosity. Mostly this was due to increased number of
protons to low beta.



Paul - on 150 GeV lifetime
   Paul showed analysis of the beam lifetimes at 150 Gev during shot
setup. We have better lifetimes at 150 Gev since before January. This
seems to be related to replacement of the C0 Lambertson, but from the
data it is not possible to distinguish this from effects of unrolling
magnets in the A1 house. Plots of pbar lifetime versus proton current
also suggest that beam-beam effects do not seem to affect the lifetime
as much today as they did in the past.


Meiqin - Tev lattice on helices
    Meiqin showed a nice analysis of the calculated effects of magnet
errors on the lattice functions on the proton and pbar helix. She
compares the case of an ideal lattice to a lattice with errors. At 150
Gev the errors are: the known skew component of the dipoles (a1 = 1
unit); the measured rolls of the magnets; the multipoles in the dipoles;
and the feeddown sextupoles. These errors do not add much to the beta
error on the central helix (delta beta/beta is only a few percent), but
they do introduce ~15-20% delta beta/beta waves on the proton and pbar
helixes. For the collisions lattice, these introduce dispersion errors
and the calculated dispersion in the low beta quads is as much a 1
meter.

John Johnstone - easy fix of the Tev beta-wave
   John Johnstone showed how we could use the Q39C ans Q39S circuits to
reduce beta waves. The method uses simple beam measurements as a
function of excitation of the Q39C and Q39S circuits. No orbit data is
needed. This technique is the same one used during fixed target to tune
up the lattice for resonant extraction.

Pasquinelli -- Success with the schottcky.
    Ralph showed good results from the new 1.5 GHz shottcky detector. He
was able to see clear proton and pbar tunes. With a little work we can
get a rudimentary beam emittance measurement. After about 1 monts more
of work we may have a nice system for using the schottky to measure
proton and pbar tunes and emittance. Also, Ralph believes that we may
have our pbar tunes crossed at collisions. If this is true (which is
quite possible) then it would help explain some discrepencies in recent
beam-beam tune shift measurements, and dramatically affects our
understanding of the beam-beam situation in the Tevatron at collisions.

Vladimir - bi-monthly Tev progress report
    Validimir presented Tevatron progress report. The good news is that
we have increased the peak luminsosity mostly from more protons (+19%)
and more pbars (+8%) and even had a record luminosity store of 40.75E30.
Over the past two months our average luminosity has increased by about
25%. (Editor note: Congrats to all for their hard work!) There was also
a lot of technical progress over the past few months including a
successful C0 magnet replacement, schottky comissioning, progress with
FW correction. Reliablity is still an issue and was not helped by two
magnet failures.