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Enhancing PEP-II Luminosity: Strategies and Innovations for Future Upgrades

This presentation outlines critical advancements and strategies for upgrading the PEP-II accelerator to achieve a two-fold increase in luminosity, aiming for a target of 2.0 x 10^34 cm^2/s. Key enhancements include a 40% increase in beam current, adjustments to beam size to improve performance, and enhancements to beam-beam parameters. The discussion also highlights the importance of maintaining detector background levels and improving accelerator reliability, alongside innovative techniques like the crabbed waist method for optimizing collision dynamics.

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Enhancing PEP-II Luminosity: Strategies and Innovations for Future Upgrades

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  1. PEP-II MAC Highlights Frank Zimmermann, RLC 07.11.2006

  2. John Seeman 1.2 x 1034 Vacuum issues Frank Zimmermann, RLC 07.11.2006

  3. John Seeman Future PEP-II Overall Parameters and Goals 4 times design 7 times design

  4. John Seeman PEP-II Upgrades • Goal: A factor of two in PEP-II luminosity • (1.2  2 x1034/cm2/s) will come from: • Increasing each beam current by 40%. • Lowering by* from 11 to 8.5 mm giving 20%. • Increasing the beam-beam parameters by10%. • Keeping detector backgrounds at the predicted levels. • Maintaining (and improving) accelerator reliability. Frank Zimmermann, RLC 07.11.2006

  5. x DAFNE Upgrade with Large Piwinski Angle & Crab Waist bY Pantaleo Raimondi e- e+ 2Sx/q Vertical waist has to be a function of x: Z=0 for particles at –sx(- sx/2q at low current) Z= sx/q for particles at + sx(sx/2q at low current) Crabbed waist realized with a sextupole in phase with the IP in X and at p/2 in Y q 2Sz*q z 2Sz 2Sx Crabbed waist removes bb betratron coupling Introduced by the crossing angle Frank Zimmermann, RLC 07.11.2006

  6. Makoto Tobiyama Normal movement of KEKB chambers due to rapid change of beam current Beam Abort Cooling Beam Injection Frank Zimmermann, RLC 07.11.2006

  7. Makoto Tobiyama Measurements by dial gauge 2006.06.02 - 06.07 e-beam +:outside、-:inside +0.43 -0.72 +0.13 -0 +0.55 -1.02 +0.27 -0 +1.9 -0.21 +0 -0 +0.02 -0 +0.08 -0.01 +0.47 -0.23 +0.49 -1.81 +0.48 -1.22 +0.28 -0.16 x1 B2E.95 QF6E.21 QD5E.42 QEAE.42 QF4E.35 QD3E.35 QD1E.21 B2E.96 QF2E.41 +0.26 -0.02 +0 -0 +0.15 -0.14 +0.25 -0.83 +0.48 -1.75 +0.45 -0.13 +0.58 -1.83 +1.32 -0.53 +1.55 -0.76 +0.16 -0 +0.48 -1.86 x2+1 QD1E.20 QF2E.40 B2E.93 QD3E.34 QF4E.34 QEAE.41 B2E.94 QF6E.21 QD5E.41 Large movement：Both sides of B-chamber、Long-Q-chamber+BPM Frank Zimmermann, RLC 07.11.2006

  8. Move to Test Stand for Cool-down & High Power Test Makoto Tobiyama K. Hosoyama, et al

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