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Advanced Synchrotron Arc Design |

Explore the innovative design of a hybrid synchrotron using cold and warm dipoles for high-field bending and fast energy ramping. Optimization, results, and analysis included. |

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Advanced Synchrotron Arc Design |

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  1. Hybrid Synchrotron Arc:2 Dipoles per Half Cell, Cold at F J. Scott Berg Advanced Accelerator Group Meeting 21 July 2011

  2. Basic Structure of Machine • Hybrid synchrotron using fixed cold and warm ramped dipoles to get • High average bending field • Extremely fast ramping • Accelerate 375 GeV to 750 GeV • 8 straights for RF, injection, extraction, etc. J. S. Berg: 2 Dipoles, Cold at F

  3. Basic Arc Cell Structure • FODO cell, quads split in two • Eventually have sextupole in middle • Currently zero length nothing with drifts around it • 75 cm drifts between magnets • Cold 8 T dipole near F • Warm ramped dipole near D, −1.8 to +1.8 T • Quadrupoles ramped, maximum pole tip 1.3 T J. S. Berg: 2 Dipoles, Cold at F

  4. Basic Arc Cell Structure Cold Warm D Warm Cold J. S. Berg: 2 Dipoles, Cold at F

  5. Optimization Process • Find closed orbit at 375 GeV with warm dipoles at −1.8 T, 750 GeV with warm dioples at +1.8 T • Set tunes to desired values, times of flight equal using quad fields and cold dipole length • Minimize excursion with warm dipole length • Adjust quadrupole lengths so pole tip fields low enough J. S. Berg: 2 Dipoles, Cold at F

  6. Results and Analysis • Results look awful, but intentionally non-optimal lattice structure • Should have more dipoles per cell • Probably better with cold dipole near D • Look at how excursions, circumference depend on number of arc cells • Only up to 8 cells/superperiod so far J. S. Berg: 2 Dipoles, Cold at F

  7. Ring Circumference (Arcs Only) J. S. Berg: 2 Dipoles, Cold at F

  8. Maximum Orbit Excursion J. S. Berg: 2 Dipoles, Cold at F

  9. Results and Analysis • Orbit excursion improving rapidly with more arc cells • Circumference reduces, surprisingly • Quads must get longer for large excursion • Circumference prefers medium horizontal tune, low vertical tune • Excursion likes both tunes high, horizontal more so J. S. Berg: 2 Dipoles, Cold at F

  10. Results and Analysis • Excursions shown are in D; much lower in F • Probably better with warm dipole near F • Excursions very high • Know we should have more dipoles per cell • Circumference higher than Tevatron tunnel • Only arcs at this point! • Not sure if this will improve with more dipoles • Could reduce energy range J. S. Berg: 2 Dipoles, Cold at F

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