Antiproton Production Plans
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Transcript of Antiproton Production Plans
Antiproton Production PlansAntiproton Production Plans
Keith Gollwitzer
Antiproton Source DepartmentAccelerator Division
September 15, 2006
OutlineOutline•Brief Review of Antiproton Production
•Status
•Improvement Plan– Outlined in February– Status and Plans
120GeV Protons to Target120GeV Protons to TargetN
ickel Alloy T
arget with C
opper (air) cooling
Focus-Transport 8GeV SecondariesFocus-Transport 8GeV Secondaries
Pulsed Lithium Lens
Collect-Cool-Transfer-Stack&CoolCollect-Cool-Transfer-Stack&Cool
Debuncher
Accumulator
Accumulator Antiproton Energy Spectrum: StackingAccumulator Antiproton Energy Spectrum: Stacking
Injection
Depositio
n
Cor
e
StacktailPa
rtic
le D
en
sity
log
S
cale
Stacking ComparisonStacking Comparison
0
5
10
15
20
25
-10
0
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10 -5 0
Days
Da
y's
Be
st
Ho
ur
of
Sta
ck
ing
(m
A/h
r)
0
500
1000
1500
2000
2500
To
tal
Pb
ars
(m
A/w
ee
k)
Mid-Nov to Shutdown -- openShutdown to Now -- filled
February’s “Future Pbar Work”February’s “Future Pbar Work”• Slip Stacking (7%)
– Currently at 7.5x1012 on average
– Design 8.0x1012 on average
• Lithium Lens (0 – 15%)– Lens Gradient from 760T/m
to 1000 T/m
• AP2 Line (5-30%)– Lens Steering– AP2 Steer to apertures– AP2 Lattice
• Debuncher Aperture (13%)– Currently 30-32 mm-mrad– Design to 35 mm-mrad
• DRF1 Voltage (5%)– Currently running on old
tubes at 4.0 MEV– Need to be at 5.3 MeV
• Accumulator and D/A Aperture (20%)– Currently at 2.4 sec– Design to 2.0 sec
• Stacktail Efficiency– Can improve core 4-8 GHz
bandwidth by a factor of 2
• Timeline Effects– SY120 eats 7% of the
timeline
Slip StackingSlip Stacking• Slip Stacking (7%)
– Currently at 7.5x1012 on average
– Design 8.0x1012 on average
• Lithium Lens (0 – 15%)– Lens Gradient from 760T/m
to 1000 T/m
• AP2 Line (5-30%)– Lens Steering– AP2 Steer to apertures– AP2 Lattice
• Debuncher Aperture (13%)– Currently 30-32 mm-mrad– Design to 35 mm-mrad
Booster took sometime to get back to providing the intense beam after the shutdown.
Main Injector is handling the beam quite well.
Only the last few weeks have been at 8x1012.
Quality is good – bunches could be a little shorter.
Lithium LensLithium Lens• Slip Stacking (7%)
– Currently at 7.5x1012 on average
– Design 8.0x1012 on average
• Lithium Lens (0 – 15%)– Lens Gradient from 760T/m
to 1000 T/m
• AP2 Line (5-30%)– Lens Steering– AP2 Steer to apertures– AP2 Lattice
• Debuncher Aperture (13%)– Currently 30-32 mm-mrad– Design to 35 mm-mrad
Problem has always been balance between lens production and lens lifetime as a function of gradient
New diffusion bonded lenses have been made. 8mm tested and used during the Fall 2005. Nominal 10mm improved design and has been tested and is being installed on target station module.
10mm lens will be the next one installed if the next lens failure does not occur in the next few weeks.
Will slowly increase gradient and have to make AP2 optics adjustment to match
Minimally expect longer lasting lens
AP2 OrbitAP2 Orbit• Slip Stacking (7%)
– Currently at 7.5x1012 on average
– Design 8.0x1012 on average• Lithium Lens (0 – 15%)
– Lens Gradient from 760T/m to 1000 T/m
• AP2 Line (5-30%)– Lens Steering– AP2 Steer to apertures– AP2 Lattice
• Debuncher Aperture (13%)– Currently 30-32 mm-mrad– Design to 35 mm-mrad
During the shutdown, two additional trims were added to line.
To make progress requires long periods of stability of the 120GeV proton beam (Osc. Overthruster). BPM problems and needing to ask for “hours” while having pbar hungry customer.
Software progress has been great and awaits testing.
Low pass filter solution is near at hand
1/3 of filters installed; rest on order.
Will need to set program of many hours of watching the software run and make adjustments
1st Vertical BPM
Oth
er P
1 B
PM
s8th
H
7th H
5th
V
2nd V
Debuncher ApertureDebuncher Aperture• Slip Stacking (7%)
– Currently at 7.5x1012 on average
– Design 8.0x1012 on average
• Lithium Lens (0 – 15%)– Lens Gradient from 760T/m
to 1000 T/m
• AP2 Line (5-30%)– Lens Steering– AP2 Steer to apertures– AP2 Lattice
• Debuncher Aperture (13%)– Currently 30-32 mm-mrad– Design to 35 mm-mrad
During the shutdown only the Extraction Kicker stand was motorized.
During startup admittances measured 33 mm-mrad.No work was done to optimize orbit/aperture with reverse protons.
Extraction kicker stand centered on stacking beam mid-June
Extraction Kicker beam tube was meant to be replaced during shutdown; vendor problem.
Hope for delivery by end of year
Installation is expected to be < 5daysLook for opportunity orSchedule orNext long shutdown
5% increase acceptance for large Δp/p antiprotons
DRF1DRF1The problem had been that the PA tubes were getting old and delivery had been delayed.
A full set of PAs arrived during the shutdown and now have 5.6MV.
• DRF1 Voltage (5%)– Currently running on old
tubes at 4.0 MEV– Need to be at 5.3 MeV
• Accumulator and D/A Aperture (20%)– Currently at 2.4 sec– Design to 2.0 sec
• Stacktail Efficiency– Can improve core 4-8 GHz
bandwidth by a factor of 2
• Timeline Effects– SY120 eats 7% of the
timeline
Accumulator & D/A ApertureAccumulator & D/A ApertureV. Lebedev is looking at redesigning the Accumulator and D/A optics. The Acc optics were cobbled together 7 years ago. The D/A matches on paper.D/A BPMs is current project.
• DRF1 Voltage (5%)– Currently running on old
tubes at 4.0 MEV– Need to be at 5.3 MeV
• Accumulator and D/A Aperture (20%)– Currently at 2.4 sec– Design to 2.0 sec
• Stacktail Efficiency– Can improve core 4-8 GHz
bandwidth by a factor of 2
• Timeline Effects– SY120 eats 7% of the
timeline
This will require lots of reverse proton study time.
First need to center beam in the quad centers with reverse protons and then optimizing the aperture.
Next implement optics change; probably several iterations.
Optimize stacking/cooling systems with new optics
Stacktail & Core SystemsStacktail & Core Systems4-8GHz core system had a coax cable replaced by fiber increasing the bandwidth as well as an attenuator removed to allow more gain.
Stacktail medium plate was replaced during the shutdown. Problem recently found and corrected.
There are many gain knobs and phases to setup the systems.
• DRF1 Voltage (5%)– Currently running on old
tubes at 4.0 MEV– Need to be at 5.3 MeV
• Accumulator and D/A Aperture (20%)– Currently at 2.4 sec– Design to 2.0 sec
• Stacktail Efficiency– Can improve core 4-8 GHz
bandwidth by a factor of 2• Timeline Effects
– SY120 eats 7% of the timeline
Much work to be done here to find the best setup.
Measurements are/will be made to see how to get to the higher rates beyond the current system: bandwidth, notch filters, dynamic range, S/N….
TimelineTimelineWas not present for awhile.
Have been running 12hr/day and want primetime; successfully set SY run 0600-1800
Pbar people have been taking advantage after 1800 to tune
Now, SY goes off for 3 months.
Come back?? Running conditions???????
• DRF1 Voltage (5%)– Currently running on old tubes
at 4.0 MEV– Need to be at 5.3 MeV
• Accumulator and D/A Aperture (20%)– Currently at 2.4 sec– Design to 2.0 sec
• Stacktail Efficiency– Can improve core 4-8 GHz
bandwidth by a factor of 2
• Timeline Effects– SY120 eats 7% of the timeline
Quick SummaryQuick Summary
• Antiproton beam is getting into the Accumulator– Stacktail will be continual tuning focus– Will be looking at Stacktail upgrade(s)
• Other aspects of antiproton production are being improved – Stable consistent production– More antiprotons delivered to Stacktail