October 18, 2007 QWG5 -- DESY -- Gollwitzer 1

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