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Antiproton Production Plans

Antiproton Production Plans. Keith Gollwitzer Antiproton Source Department Accelerator Division September 15, 2006. Outline. Brief Review of Antiproton Production Status Improvement Plan Outlined in February Status and Plans. Nickel Alloy Target with Copper (air) cooling.

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Antiproton Production Plans

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  1. Antiproton Production Plans Keith Gollwitzer Antiproton Source Department Accelerator Division September 15, 2006

  2. Outline • Brief Review of Antiproton Production • Status • Improvement Plan • Outlined in February • Status and Plans

  3. Nickel Alloy Target with Copper (air) cooling 120GeV Protons to Target

  4. Pulsed Lithium Lens Focus-Transport 8GeV Secondaries

  5. Debuncher Accumulator Collect-Cool-Transfer-Stack&Cool

  6. Particle Density log Scale Core Deposition Injection Stacktail Accumulator Antiproton Energy Spectrum: Stacking

  7. Stacking Comparison Mid-Nov to Shutdown -- open Shutdown to Now -- filled

  8. 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 February’s “Future Pbar Work”

  9. 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. Slip Stacking

  10. 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. Lithium Lens 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

  11. 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. Other P1 BPMs 8th H 7th H 5th V2nd V 1st Vertical BPM AP2 Orbit 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

  12. 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 Debuncher Aperture 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 < 5days Look for opportunity or Schedule or Next long shutdown 5% increase acceptance for large Δp/p antiprotons

  13. The 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 DRF1

  14. V. 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 Accumulator & D/A Aperture 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

  15. 4-8GHz 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 Stacktail & Core Systems 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….

  16. Was 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 Timeline

  17. Quick 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

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