Minutes of the July 8, 2005 Tevatron Dept Meeting

1. Farewell, Petr! (Petr's Guest Scientist term is over and he goes back
to Russia.)

2. Vladimir presented quarterly Tevatron status report (see doc-1895),
major next steps are a) change beta* to 28 cm, b) improve lifetime at LB;
c) perform studies near 2/3 WP. He predicts that record luminosity at CDF
can reach 150-160 e30 before Oct shutdown.

3. Bruce, Elmie and Jean-Paul attended US Particle Accelerator School at
Cornell, they've learned a lot and were quite impressed with the
quality and usefulness of the courses (e.g. live CESR lattice
measurements).

4. Vahid on operations: 4 stores, Lumi 81-104, QC45 quad was in bad state
in #4250 resulting in larger pbar loss on ramp; all dipole correctors
in C2 were flaky during store #4262 --> 0.2 mm orbit changes (CAMAC PS fixed 
after the store); CDF hall temperature variations (~2 deg C) led to low beta 
quads motion (~10-30 microns) --> orbit moved in arcs, worsened beam lifetime
when closer to collimators.

5. Mike Martens moved beam in the VA33 BPM (over a grid, +-8mm V and H)
and calculated nonlinear and out-of-plane corrections. With proper cubic
correction, the residuals at 10 mm are about 0.1 mm. He confirmed that the
BPM appears to be rolled by several degrees - in agreement with what Sasha
sees in ALL BPMs (V and H, 2 deg) and guesses it may come from the fact
that feedthrus are connected off the BPM plate azimuthal center. Also,
theoretical formulas predict 29 mm effective Tev BPM radius, while in
reality it is 26.0 (edge or cross-coupling effect?). A number of
measurements at the test bench are proposed (J.Steimel, J.Fitzgerald).

6. Andreas reported indications of the beam-beam tune SPREAD seen by 1.7
GHz Schottky detector - of the order of 0.005 rms - which adds up to the
beatatron line width (only in pbars, as expected).

7. Dan Bollinger presented status of the HV seprator controls needed for
new separators to be installed during coming shutdown: current boards are
built ca 1989; he has resigned and build a number of digital and analog
boards, testing is underway.

8. Elmie Peoples explained how she is modifying digital notch filter
boards needed for long and transverse dampers. She also works on HV
separator spark counter boards.

9. Studies: a) Sasha showed the latest 28* cm beta* optics calculations -
version 52 is almost OK (except 6 cm D_x at D0). Hopefully a better solution
will be found soon; b) list of desired studies for the next week includes:

orbit smoothing studies (MM)
wet squeeze and LB pbar tune adjustment (RM, JA)
several EoS for TT (Tan) and Octupoles (YuA)
crystal collimator checkup at 150 (Dean)
one more store with large Np (AJ)
pbar tune control in stores (RM)
21MHz Schottky with only one pair of detectors (RM)


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