Minutes of the May 7, 2004 Tevatron Dept Meeting

1. Weekly operations report from Aimin: 5 stores, lumi btw 52 and 59.5,
all ended intentionally, 5 beam studies (see below), proton and luminosity
lifetimes were better in the first 3 stores, but are back to worse in the
last two stores 3469 and 3471 (e.g. 48 hrs for protons in 3471).

2. Jim Steimel described on-going BPM work in service buildings: pbar
cables have to be released and pulled to new BPM racks, cable TV sets to
be moved; some 4 hours access needed to connect cables to pbar ends of
the A3 house BPMs. By Aug.23 one house will be equipped with prototype BPM
modules, installation for the rest of the ring will take place during '04
shutdown, commissioning - after it.

3. Tan's TuneTracker (TTT or T3) now uses old Schottky tickler (instead of
regular BPM) to excite beam with 2.5 mW of power. T3 reports tune 3 times
per second with accuracy 5e-5, pulsed PLL test was successful. Will test
T3 at the EoS and later on a dedicated ramp. T3 can work with coalesced
and uncoal beams. So far only in 1 plane (H). Tan sees unequally spaced SB
lines in spectrum of coalesced beam at 150. T3 shows that QINJ mult (used
for tuning at 150 GeV) is mis-scaled by some 20%.

4. Mike Martens, Valery and Jerry corrected LB optics (reduced beta^*)
at the end of #3469 and observed 6-9% luminosity increase at D0 and 4-7%
at B0. Required tune corrections are of the order of 0.020-0.030,
chromaticity corrected by some 28 units (esp. Vert). Separator voltages
had to be adjusted, too (e.g.40 kV in D48H - according to Yuri's
calculations)  and led to another 0.5% luminosity increase. Alpha bumps at
IPs did not affect lumi or losses much. Losses and lifetimes were OK.
They will introduce the corrections in C49 (spread over three steps and
squeeze - seq.23,24,25) - have study time next week.

5. Stephen Pordes, Eugene and Sasha Valishev observed accumulation of
10e9 protons in DC beam with SL monitor after TEL was turned off at the
EoS #3469. Seems that such an Abort Gap Monitor can see 2e9 or so. They
need about 2 weeks to make it properly working and reporting to ACNET.


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