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Store Summary: Another So-So week Woes in Pbar-land Schedule for Week. Week in Review: 03/24/03 –03/30/03. Ron Moore – FNAL. Store Summary. FY03 Performance vs Plan. 5 pb -1 behind base plan now. Courtesy Steve Holmes. Pbar Woes. - PowerPoint PPT Presentation
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All Experimenters' Mtg - 31 Mar 03
f Week in Review: 03/24/03 –03/30/03
Ron Moore – FNAL
• Store Summary: Another So-So week• Woes in Pbar-land• Schedule for Week
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 2
f Store Summary
StoreInitialLumi (E30)
CDF Deliv’dLumi
TerminationDuration
(hr) Comments
2343 31.5 804 Intentional 10.1Poor lifetime; High CDF losses;
D47 turbo pump failed
2357 28.5 1181 Intentional 20.9High CDF proton losses;
collimators aligned during store
2361 17.7 592 Abort 13.1Shot from only 80 mA; no Tev transverse
dampers; good proton losses; D0Q3 lead failure
2370 29.2 1212 Intentional 19.636x32 store (missed 1 pbar transfer);
Proton bunch length blow-up in squeeze; high CDF proton losses
2372 0.5 1.2 Intentional 0.75Smooth shot-setup;
B17 separator sparks wiped out pbars
2375 20.4 576 Intentional 11.5Shot from 108 mA; No transverse dampers; poor lifetime on helix; CDF proton losses good again
800 1000 1200 1400 1600 1800 2000 2200 24001000
2000
3000
4000
5000
6000
7000
8000
Proton Intensity @ HEP
Pro
ton
Inte
nsity
(E
9)
800 1000 1200 1400 1600 1800 2000 2200 2400
0
200
400
600
800
1000
Pbar Intensity @ HEP
Pba
r In
tens
ity (
E9)
800 1000 1200 1400 1600 1800 2000 2200 2400
0
5
10
15
20
25
30
35
40
45
Store NumberInitial Luminosity
Avg
Lum
i (E
30)
Store Number
0.0
50.0
100.0
150.0
200.0
250.0
300.0
9/30 12/30 3/31 6/30 9/29
Date
Inte
gra
ted
Lu
min
os
ity
(p
b-1
)
Stretch Goal
Base Goal
Actual
FY03 Performance vs Plan
5 pb-1 behind base plan now
Courtesy Steve Holmes
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 7
f Pbar Woes
• On 3/24, PMAG began tripping on ground fault indication– Pulsed magnet downstream of Li lens, bends pbars 3 into AP2 line
– Required 12 hours to replace
– This PMAG has 4.6 E6 pulses (not counting testing pulses)
– Bad electrical connection on endplate (just like previous failed PMAG)
• Also on 3/24, AP2 vacuum degraded– Stacking was not really affected by the vacuum – keep running
• On 3/25 (after PMAG replacement), stacking deteriorated badly– AP2 vacuum failed – almost at atmosphere
– Ti window at upstream end (within target station) likely ruptured
– Added 2 new 3 mil thick Ti windows plus a roughing pump port at upstream of AP2 line (within Transport enclosure)
– Replace the failed window during summer shutdown
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 8
f Failed PMAG
Pbars go this way to AP2 & Debuncher
PMAG
new vacu
um windows
new ro
ughing pump portAP3
Target
enclosure
AP2
Pbars go th
is way
to D
ebunch
er
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 11
f Other machines
• Linac – LRF4 hanging on day-to-day
• Booster– Raised MP01 by 2 mm to reduce nearby dogleg strength
– Even better now: MiniBoone > 4 E16 protons/hr while stacking, close to 5 E16 protons/hr if not stacking
• Recycler– Vacuum techs found a vacuum leak on ion pump flange @ 202
– Is this the source of lifetime problems?
– Need ~6 hour access to repair leak
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 12
f Tevatron
• Attempt at orbit smoothing maintenance failed last week– Vertical corrector near IPs would run too hard > 50 amps
– Vertical orbits have changed by 1 mm since Thursday
– Will smooth orbits and tune-up a bit this week
• Transverse dampers– Proton instabilities when dampers on
– Electronics checked out OK
– Poor coupling on proton helix exacerbated anti-damping?
• Collimators– Raised current limit on motors back to 6 A
– Removed motor/LVDT offsets; aligned proton collimators
– Added filtering capacitors on cables to eliminate fake limit switch errors
– CDF proton halo losses look OK now
Weekly Schedule
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 14
f Changing of the Guard
• Keith Gollwitzer becomes Run Coordinator tonight
• Thank you for your support over the past 4 months!
• Good Luck, Keith!
• Best wishes for a stable accelerator complex and improving luminosity delivered and written to tape!
All Experimenters' Mtg - 31 Mar 03
R. Moore - FNAL 15
f Summary
• Another mediocre week: only 3.8 pb-1 delivered
• Pbar pulsed magnet and AP2 vacuum failures resulted in > 24 hours with no stacking
• Problems with dampers and/or orbits prevented us from using Tev transverse dampers
• Booster MP01 raised 2 mm allowing more beam to MiniBoone
• Have 3 shifts of Tev maintenance for smoothing and tune-up
• Stack & Store for remainder of week