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Hybrid Fast Ramping Synchrotron Lattice Design

Hybrid Fast Ramping Synchrotron Lattice Design. J. Scott Berg Advanced Accelerator Group Meeting 14 July 2011. Don Summer’s Basic Concept. Need a high average bending field But want to ramp like a synchrotron Requires warm magnets with low field

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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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