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Existing Fermilab Pbar SourceExisting Fermilab Pbar Source
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E760/E835 OperationE760/E835 Operation
• Stack up to 60-100e10 antiprotons– Up to 4e10 pbars/hr {Today 20e10/hr goal 25e10/hr}– Stacking time: 1+ days {Today 3-4hr of stacking}
• 1-2 hr to decelerate and prepare beam• Run experiment 2-4 days
– Luminosity 2-4e31 cm-2s-1
• Accelerator-Jet Target capable of > 1e32 cm-2s-1
• Detector designed for e31 cm-2s-1
{20+ years of detector & DAQ improvements > 1e32 cm-2s-1}
• 1 hr to re-establish stacking
• Range: 3.4-8.9 GeV/c (Ecm= 2.9-4.3 GeV)
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Attempt at ComparisonAttempt at Comparison
Fermilab Achieved FAIR Designed
20 Accumulation rate [1010/hr] 3.5
2 x 107 Laboratory running time for one year [sec]
2 x 107
Pbar vs ion running 50%
Pbar to HESR 50%
10%Stacking fraction due to
experiment in the Accumulator
400# pbars to experiment for one
year [1015]175
3.4 to 8.9 Range [GeV/c] 3 to 15
10 Δp/p [10-5] 1 or 10
1-8 Luminosity [1031 cm-2 sec-1] 1 or 20
2011 Start data taking 2014
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PhysicsPhysics
• All Charmonium states except (4415) c, J/, c’s, hc, /
c, /
– X(3872), Z(3930), Y(3940), X(4160), Y(4260), Y(4350)?
• Other non-Charmonium measurements are possible as outlined by FAIR-PANDA
• Need to form a collaboration and propose an experiment to start data taking in 2011
c2 (2P)
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Empty Experiment Area Empty Experiment Area
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Quick HistoryQuick History• The Fermilab Antiproton Source was built for the
Tevatron proton-antiproton collider program in the 1980’s– Key to Tevatron total integrated luminosity
• While Fermilab ran fixed target programs, the Antiproton Source would have sat idle except for the Charmonium program (E760/E835) which ran in 1990-1, 1996-7 & 2000– Circulating antiprotons with internal Hydrogen gas jet
target• Study of pbar-p annihilations into cbar-c states
A Charmonium A Charmonium Experiment in the Experiment in the
Fermilab Fermilab Antiproton Source Antiproton Source
After Run IIAfter Run IIKeith Gollwitzer
Antiproton Source Department
Accelerator Division
Fermilab
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Improvements since E760/E835Improvements since E760/E835
• Accelerator advances– Can average stacking at 20e10 pbars/hr
• Plans for > 25e10 pbars/hr
• Detector advances– Calorimetery– Tracking– Digitization at detector– Computation power: trigger/DAQ
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