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Hybrid Fast Ramping Synchrotron Lattice Design

This document discusses the innovative hybrid lattice design combining warm and superconducting magnets for efficient synchrotron operation. The text covers key concepts, cell design, structural decisions, dipoles arrangement, and current study status.

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Hybrid Fast Ramping Synchrotron Lattice Design

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  1. Hybrid Fast Ramping Synchrotron Lattice Design J. Scott Berg Advanced Accelerator Group Meeting 14 July 2011

  2. Don Summer’s Basic Concept • Need a high average bending field • But want to ramp like a synchrotron • Requires warm magnets with low field • Solution: interleave fixed superconducting magnets and ramped warm magnets • More interleaved magnets gives: • Less excursion (like single magnet with average field) • More space wasted in drifts J. S. Berg: Hybrid Synchrotron Lattice

  3. Don’s Basic Cell Design • FODO cells with 5 dipoles in each drift W C Warm C W D W C Warm C W • In addition to this, we need sections for • Injection and extraction • RF • Will need to match into these • Need to keep time of flight constant J. S. Berg: Hybrid Synchrotron Lattice

  4. Decisions on Structure • 8 RF sections • Get sufficient synchrotron phase advance • More sections increases circumference • Three cells, two with RF • Third (center) cell for injection/extraction • Arc-to-straight matching sections: 2 cells • Eliminate closed orbit variation with energy • Zero dispersion J. S. Berg: Hybrid Synchrotron Lattice

  5. My current studies • Arc cell has constant tunes and time of flight • Look at optimum structure for arc cell • Number and arrangement of dipoles in cell • Number of cells per arc • Increasing either count at first reduces excursions • With large counts, improvement stops • Inter-magnet drifts dominate length • Increased quadrupole strengths for short cells J. S. Berg: Hybrid Synchrotron Lattice

  6. Arrangement of Dipoles Cold Warm D Warm Cold vs. Warm Cold D Cold Warm J. S. Berg: Hybrid Synchrotron Lattice

  7. Arrangement of Dipoles C Warm D Warm C C C vs. W Cold D Cold W W W J. S. Berg: Hybrid Synchrotron Lattice

  8. My Current Status • Optimizing design of my first cell • 4 cells per arc (32 cells for full ring!) • 1 warm and 1 cold dipole per half cell • Starting with cold near F • Not completed, but • Excursions are huge (expected) • Excursions severely imbalanced in F and D: warm near F likely better J. S. Berg: Hybrid Synchrotron Lattice

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