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Accelerator Progress, Plans, and Strategies

Accelerator Progress, Plans, and Strategies. R. Dixon. Preview. Outlook from my Perspective The program Strategy Status and Progress during the past year The Run II Plan Resources Summary. Physics Program. Currently Running Run II (Operations and Upgrades) CDF Dzero MiniBooNE

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Accelerator Progress, Plans, and Strategies

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  1. Accelerator Progress, Plans, and Strategies R. Dixon

  2. Preview • Outlook from my Perspective • The program • Strategy • Status and Progress during the past year • The Run II Plan • Resources • Summary

  3. Physics Program • Currently Running • Run II (Operations and Upgrades) • CDF • Dzero • MiniBooNE • Working on for the Near Future • NUMI/MINOS • SY120 • E907 • Test Beams

  4. Farther in the Future • BTeV • CKM • MuCool • Linear Colliders • LHC

  5. Concerns • To Run the Program we must solve • Complexity • Collider is being pushed to the limit • We have other programs to run • Maintenance of our complex • Tevatron is 20 years old • Linac is 32 years old • Manpower for the tasks • Predicting the performance

  6. Summary of Concerns • The budget has effectively gone down while the our program has become more complicated, and the complex has grown old.

  7. Strategy • Increase our efficiency within the Division • Better integration • More predictability • Modeling • Configuration control • Effective use of task forces that span Divisions

  8. Strategy (Con’t.) • More collaboration • Inter Divisional • With Users • Bring in analysis and DAQ skills • With other Laboratories

  9. Run II Integrated Luminosity

  10. Run II Peak Luminosity

  11. Hours per Week

  12. Luminosity vs Proton and Pbars From Mike Church

  13. Proton Emittance Growth • Longitudinal • MI-- intentional + coalescing-- 2.1 to 4.0 ev-sec • Transverse • Transfer to Tevatron-- 17 to 25 π-mm-mrad

  14. Pbar Emittance Growth • Longitudinal • Unstacking-- 1.1 ev-sec to 1.5 ev-sec • MI • Coalescing-- 1.5 to 3.0 ev-sec • Transfer to Tevatron-- 3.0 to 3.5 ev-sec • Tevatron • Up the ramp-- 3.5 to 3.5 to 4 ev-sec

  15. Pbar Emittance Growth • Transverse • Mostly in the transfer from MI to Tevatron-- 8 π-mm-mrad to 20 to 25 π-mm-mrad

  16. Integrated Luminosity & Goals Goal curves were defined in Oct 02

  17. Recent Improvements • Removal of the C0 Lambertson • Allows increased separation of the helices • Reduces impedance seen by beam • Accumulator stochastic cooling bands 2&3 equalizers • Tevatron Transverse Dampers • Booster Dogleg Improvements

  18. Booster Dogleg • Each of the two Booster extraction septa has a set of vertical dogleg magnets to steer the beam around it during acceleration. • More powerful doglegs were installed in 1998 to reduce losses early in the cycle. • These magnets have an edge focusing effect which distorts the horizontal injection lattice: • 50% increase in maximum beta • 100% increase in maximum dispersion. • Harmonic contributions. • Effect goes like I2. Now tune to minimize. • Recently got an unusual opportunity to explore potential improvements from fixing the problem. • Working on schemes to reduce or remove problem. (from E. Prebys)

  19. Booster Dogleg (continued) March 6, 7 turns, 1 dog March 3, 7 turns, both dogs (from E. Prebys)

  20. Working on • MI Dampers • F0 Lambertson Shielding • Injection matching into the Tevatron • Tevatron BPMs • Tevatron Alignment • Reliability Issues • Linac Power Amplifier Tubes (7835s) • Tev magnet stands • Kicker resonant charging • . . .

  21. Tevatron Magnet Rolls

  22. Tevatron coupling (continued) Tevatron dipole cross section Mike Church (from P. Bauer)

  23. Tevatron coupling Data shows in-plane and out-of-plane difference orbits after single horizontal kick. Data is for 1st 5 turns in Tevatron. (from M. Syphers) Coupling in Tevatron is ~uniform around the ring and is consistent with ~1.5 units of a1 per dipole. This is compensated by a distributed skew quad circuit of 42 elements.

  24. Run II Plan • Goals • High integrated luminosity by beginning of LHC era • Integrated into Division plans for NUMI, Reliability, SY120, etc. • Upgrade Plan • Increase Pbar stacking • Minimize beam-beam interactions in the Tevatron • Plan to be submitted June 15 and reviewed July 22 • Critical items • Recycler commissioning • Electron Cooling

  25. Elements of the Plan • Slip Stacking in MI • Upgrade Targetting for Pbars • Sweep beam • Investigate replacing Nickel target with Iconel • Upgrade Lithium Lens to 1000 T/m • Upgrade Debuncher and Accumulator Cooling systems for higher stacking rate • Add Recycler ring for off loading Accumulator--> larger stacks

  26. Elements of Plan (con’t.) • Electron Cooling in Recycler • Rapid tranfers to Recycler • Active Beam-Beam compensation in the Tevatron • Increased separation between protons and Pbars in the Tevatron

  27. Run II Organization

  28. Recycler • Needs more access time • Vacuum • Shielding • Needs a focused effort • More manpower • Dedicated department

  29. Summary • Peak Luminosity is steadily increasing • Many short-term improvements to be made that will result in gains • Integrated Plan for Major Upgrade including reliability which will require collaboration in addition to sufficient funding • Crucial technical items include the Recycler and electron cooling.

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