A. Leveling - Fermilab Recent Operating Experience at the Antiproton Source Target Hall 3 rd High Power Targetry Workshop September 12, 2007 Fermilab Accelerator.

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Presentation transcript:

A. Leveling - Fermilab Recent Operating Experience at the Antiproton Source Target Hall 3 rd High Power Targetry Workshop September 12, 2007 Fermilab Accelerator Division Antiproton Source Department Anthony Leveling

A. Leveling - Fermilab Synopsis of this talk Tevatron collider performance –Integrated luminosity by year Anti-proton source role –Prior to May 2004 –After May 2004 –Performance Target station operating experience –Target developments since 2003 –Recent observations and developments

A. Leveling - Fermilab Tevatron Collider Program

A. Leveling - Fermilab Aerial photograph of Pbar Source & Recycler

A. Leveling - Fermilab Collection lens gradient increases Old lens and Smaller spot size on target Booster improvements MI slip stacking Begin pbars from Recycler to Tevatron

A. Leveling - Fermilab

180 cm Final focusing quads 8E12 to 9E GeV every 2.4 s 9 steel modules 30 X 180 cm Vacuum window 120 cm cap 8 GeV negative secondaries bend 3 degrees into page by pulsed magnet

A. Leveling - Fermilab Target 2 Six 0.95 X 10 cm diameter target disks Seven copper cooling disks Air exhaust 3.1E19 protons – 525 day service life 1/03 to 7/04 Air supply

A. Leveling - Fermilab Target 3 Four 0.95 X 10 cm disks with carbon-carbon cover Two 0.95 X 12.7 cm disks with Ti cover (destroyed by the beam) 3.2E19 protons – 420 day service life 7/04 to 8/05 Air cooling flow similar to target 2

A. Leveling - Fermilab Target 4 – new Six 1.6 X 11.4 cm disks With carbon-carbon cover Air cooling flow similar to target 2

A. Leveling - Fermilab Target 4 end of life Improved 120 GeV optics 120 um spot size First target to sputter target material October 2005 had to increase spot size to 200 um(?) 2E19 Protons day service life 8/05 to 5/06

A. Leveling - Fermilab Target 5 Three disks 2.15 X 11.4 cm Air flow

A. Leveling - Fermilab Center 10 days Above/below center 7 days Outer positions 4 to 5 days

A. Leveling - Fermilab 1.7E19 protons 133 day service life 5/06 to 9/06 2E19 protons 119 day service life 9/06 to 1/07 2E19 protons 105 day service life 1/07 to 5/08 Target 5 Target 6Target um spot size

High Gradient Collection Lens Introduced 10/2006 to 12/2006 –15% improvement in target yield Record stacking rate achieved 2/2007 Lens (transformer) failed in 5/2007 Had to revert to original lens design –Stacking rate dropped off 10 to 15% A. Leveling - Fermilab

US Beam Sweeping System Commissioned beginning end 04/2007 Just the upstream system 50% improvement in target lifetime 1 to 2% reduction in yield Reduced spot size to ~140 um –regained stacking rate lost by lens changeout A. Leveling - Fermilab

Target 8 1.8E19 protons 88 days service life 5/07 to present Top disk micron beam sigma with beam sweeping radius ~0.3 mm Middle disk – 140 micron beam sigma With beam sweeping radius ~0.6 mm Beam sweeping system commissioned late 4/07

A. Leveling - Fermilab

MARS 1507 result 1 sigma

A. Leveling - Fermilab Target center to lens face at low gradient ~ 17 cm 9cm

A. Leveling - Fermilab 1 sigma

A. Leveling - Fermilab 45 cm

A. Leveling - Fermilab Target center to lens face at low gradient ~ 14 cm

A. Leveling - Fermilab Target SEM 30 cm upstream of target Target sputtering events: October 2005 (cone) June through July 2007

A. Leveling - Fermilab The next generation target – December 2007 Inconel 600 cylinder Copper cooling Copper pipe shell 6 to 12 mm Cu balls H2 brazed construction Be or ALBEMET outer shell Interference fit Excludes air at surface

Pbar Target Station Summary Startup in October 2007 –Install high gradient lens (to improve yield) –Remove damaged target SEM (BL obstacle!) – evaluate pulsed magnet for replacement – restore to larger spot size (stop sputtering) Build next generation target –Return to 140 um spot size (to improve yield) Build new target SEM (spot size understanding) Continue building spare lenses Run, run, run... and integrate luminosity A. Leveling - Fermilab

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