Minutes of Tev Dept Meeting  07/26/02


1. Congratulations to Dean Still with birth of son Ethan!

2. M.Church presented his expectations in next 2 months (by Oct.1): lumi
in the range 3.9-5.0 e31, for that a) N_protons at low-beta goes up to
220e9/bunch or 10-20% from now, b) stack of pbars=130 mA or +10%, c) pbar
efficiency Accumulator to low-beta from current 43% should go up to
55-65%; d)  emittances to be improved by 10%. Tevatron is solely
responsible for a), and greatly responsible for c) and d). This plan is
somewhat more optimistic than Vladimir's (presented 2 weeks ago) which
predicted 2.5-3.0e31 by September 1.

3. Vladimir: a) July 31 Bruce Hanna will step down as Tev coordinator,
Xiao Long Zhang will be the next Tev coordinator until August 30. Thank
you, Bruce for a job well done!; b) same date Elvin Harms will step down
as the Run II coordinator and Dave Johnson (MI) will take over the
position with Ron Moore of Tev being his deputy (Ron to become Run II
coordinator Dec.1). Thank you, Elvin - your were a good one!; c)  Steve
Holmes appointed Valery Lebedev to coordinate beamlines and
injection tuning and Bill Foster to coordinate MI and RR damper work; d)
two RF engineers from TD will work on Tev Rf noise issues in cooperation
with John Reid and Jim Steimel.

4a. [Congratulations to everybody with all-time Tevatron luminosity record
of 26.4e30 in store 1583 Fri July 26! - it was right after the Tev
meeting]

4b. Bruce reviewed Tev operation last week: it was quite stable (5 stores
by Fri), good luminosity around or above 2e31 but poor lifetime. In #1576
we had fast pbar beam size growth early in store, in #1580 and #1583 - poor
proton lifetime (some 10 hrs) early in store. Attempts to fix proton
losses by adjusting tunes, coupling, and chromaticities did not succeed yet.

5. Dave Johnson presented results of 2-week old studies of P1 line: line
optics (assuming readbacks are more correct than settings) is confirmed by
BPM and multiwire measurements, there is noisy (fluctuation) jitter of dp/p
matching between the line and MI of about 1e-4. In general, there should not be
much of emittance growth in P1 line (<1pi). The only troublesome
indication is that if (due to some reason) actual vertical dispersion
in the Tevatron at injection is of the order of 0.25 m, then beam
mismatch will lead to some 3pi emittance dilution in the Tev.

6. Valery commented that his experience says that sometime current
settings reflect reality better than reading. He is ready to implement
corrections to the A1 line element currents and expects >20% emittance
improvement.

7. Wolfram reviewed many data relevant to proton loss on ramp and
concluded that most probable reason is tune modulation due to high
chromaticity (C=20, dp/p=1e-3--> dQ_m=0.02). Test experiment was performed
over weekend - three bunches with the same dp/p but different intensity
were accelerated. The highest intensity one lost a lot while others did
not loose much. [so it is contradictory to the dQ_m hypothesis].
Note, that transverse emittances were very different. More analysis to
follow.

8. Paul showed SDA data demonstrating p-emittance blow-up (bunches
1,13,25) by pbar injection kicker (some 2-4pi). That problem has been fixed over
weekend. Also, his data show huge p-emittance growth at 150 GeV before
opening helix - some 12pi/hr [factor of 2.5 of what we measured with
uncoalesced beam due to vacuum]. Is that due to 36 FWires flies?

9. Ludovic convinced us that he and Nikolai work actively on the
CDF background simulations and interseting results are coming soon.