antiproton acceptance
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2/5/2003 Steve Werkema 1
ff Antiproton AcceptanceAntiproton Acceptance
Two Projects:Two Projects:
1. High Gradient Lithium Lens
2. AP2 Beamline and Debuncher Acceptance Improvements
2/5/2003 Steve Werkema 2
ff Antiproton AcceptanceAntiproton AcceptanceBasic Layout
Scope of Antiproton Acceptance projects:
Target station - downstream of target
AP2 beamline
Debuncher ring
2/5/2003 Steve Werkema 3
ff Antiproton AcceptanceAntiproton AcceptanceMotivation
Increase the number of antiprotons collected from the target by: increasing the gradient of the collection lens increasing the admittance of the AP2 beamline and the Debuncher
MARS model ofp phase space distribution at the center of the targetp/p < 2.25%, contains onlyp’s within acceptance of Li Lens
2/5/2003 Steve Werkema 4
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens - Parameters
3
Tar
get
Li L
ens
Pul
sed
Mag
net
29 cm 81cm
PresentPresent UpgradeUpgrade
Gradient 745 T/m 1000 T/m
Radius 1.0 cm 1.0 cm
Lifetime 9106 pulses 10106 pulses
2/5/2003 Steve Werkema 5
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens - Motivation
10% increase inp yield by raising the gradient from 745 T/m to 1000 T/mFactor of 2.3 increase inp yield by raising the gradient to 1000 T/m and doubling the AP2/Debuncher Admittance
Note: Thep yield improvement per gradient increase is greater at larger admittances
2/5/2003 Steve Werkema 6
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – Present Performance
With the present design, the gradient would have to be lowered to 700 T/m to achieve a lifetime of 10,000,000 pulses.
Gradient (T/m)
Average Number of Pulses to Failure
1000 <500,000
900 1,000,000
800 3,000,000
745 9,000,000
700 >10,000,000
2/5/2003 Steve Werkema 7
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – Goals & Action Plan
• GoalGoal: Operate a Lithium lens -- at a gradient of at least 1000 T/m for at least 10 million pulses
• ActionAction PlanPlan (in process for past 5 years): Liquid Li Lens development at BINP Improvement to present design
FEA model of present design Autopsies of failed lenses
New solid Li Lens design
2/5/2003 Steve Werkema 8
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – Present Li Lens
2/5/2003 Steve Werkema 9
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – Status
• Liquid Lithium Lens developmentProject terminated in FY 2002 without producing a viable lens prototype.
• Existing Lens improvements FEA: Peak stresses during lens operation are well
below the fatigue strength of the titanium septum failure initiated by another mechanism
Autopsies of five failed lenses:o 4 septum fractures, 1 water leak (control)o Preliminary analysis suggests that cracking had been initiated
prior to pulsing the lens ResultResult: Improved quality control during fabrication of
new lenses
2/5/2003 Steve Werkema 10
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – New design
FeaturesFeatures: Diffusion bonded titanium body Thicker septum Li buffer volumes eliminated
Prototype #1 is under construction
2/5/2003 Steve Werkema 11
ff Antiproton AcceptanceAntiproton AcceptanceHigh Gradient Lithium Lens – Near Future
• Complete and test new lens design prototype #1
• Lens #22 autopsyLongest lived lens, did not fail during pulsing
• Refine and expand FEA model• Operate a lens constructed with improved quality
control procedures Operate for 1 month at 745 T/m then increase to 820 T/m
• Construct 2 new lenses with a thicker septum (20% – 50% thicker)
2/5/2003 Steve Werkema 12
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – Motivation
Goal: Goal: 40 mm-mrad transverse admittance
p phase space distribution exiting the lens for a gradient of 750 T/m.
p/p < 2.25%
Beamline optics have been adjusted to match Li lens aperture. Blue dots are horizontal, Red dots are vertical
(i.e. 2 points perp).
2/5/2003 Steve Werkema 13
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – Parameters
Recent Measurements
Physical Aperture
Goal
Horizontal (mm-mrad)
20 ± 1.5 40 40
Vertical ( mm-mrad) 12 ± 1.5 40 40
Momentum ±2.25% ±2.25% ±2.25%
2/5/2003 Steve Werkema 14
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – Issues
• Identification of limiting apertures• Correction of known limiting apertures
Beamline element alignment Orbit control
More AP2 trim dipoles Debuncher moveable quad stands
Element redesign
• Instrumentation issues– BPMs
2/5/2003 Steve Werkema 15
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – Status
The following projects are presently underway: AP2 and Debuncher documentation survey (TD)
Determine physical aperture everywhere in beamline from drawings and other documentation
AP2 line trim dipoles3 NDB dipole trims have been installed in the AP2 line during the past year
Install moveable stands on selected Debuncher quadsCables were pulled during the January 2003 shutdown. No new stands have been installed.
Beam studies88 Hours of beam studies in past year (next slide)
Debuncher BPM upgrade Have completed beam testing of a single BPM electronics prototype One sector of the Debuncher was instrumented during the January 2003 shutdown with upgraded BPM electronics
2/5/2003 Steve Werkema 16
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – Completed Studies
Beam studies completed within the past year Reverse proton studies
Re-commission and develop various beam manipulation procedures (Debuncher, AP2, DRF3, DRF1) (36 hr)
• Problem: have not yet been able to see beam on AP2 BPMs Debuncher BPMs (Re-commission old electronics and prototype testing of new
electronics) (8 hr) Aperture measurements (4 hr)
Stacking studies AP2 line orbit correction (12 hr) Measure AP2 + Debuncher admittance
(develop measurement techniques) (20 hr) Measure AP2 + Debuncher momentum aperture (8 hr)
2/5/2003 Steve Werkema 17
ff Antiproton AcceptanceAntiproton AcceptanceAP2 & Debuncher Acceptance – The Future
• Complete documentation survey• Complete Debuncher BPM upgrade• Install Debuncher moveable quad stands• Build prototype portable quad alignment device• Element redesign• Beam Studies
Commission new hardware Develop procedures (upgrade and test software & controls) Correct AP2 and Debuncher orbits
Note: much of the studies plan requires the new Debuncher BPMs and/or completed installation of the moveable quad stands.
2/5/2003 Steve Werkema 18
ff Antiproton AcceptanceAntiproton AcceptanceConclusion
Presentp yield:
1710-6 p/POT
Expectedp yield:
4010-6 p/POT
36 36 10101010pp/hr/hrdelivered to the Accumulator for stacking
For:51012 POT/pulse2.0 sec cycle time
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