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Collider Ring Optics & Related Issues

Collider Ring Optics & Related Issues. Vasiliy Morozov for the JLab EIC Study Group. MEIC Layout. Prebooster 0.2 GeV/c  3-5 GeV/c protons. Big booster 3-5 GeV/c  up to 20 GeV/c protons. 3 Figure-8 rings stacked vertically.

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Collider Ring Optics & Related Issues

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  1. Collider Ring Optics & Related Issues Vasiliy Morozov for the JLab EIC Study Group

  2. MEIC Layout Prebooster 0.2GeV/c  3-5 GeV/c protons Big booster 3-5GeV/c  up to 20 GeV/c protons 3 Figure-8 rings stacked vertically

  3. Acceleration of protons from 3-5 GeV/c to up to 20 GeV/c for injection into ion collider ring Big booster implementation options Separate warm ring in collider rings’ tunnel (current baseline) Using the electron ring Separate cold ring in the prebooster’s tunnel Big booster design considerations Avoid transition energy crossing Space charge  higher injection energy for larger ring Matching RF systems  debunch low-frequency beam and then rebunch it at higher frequency? Big Booster

  4. Geometrical matching of electron and ion rings Spin rotators in the electron ring Siberian snakes in the proton ring arcs Ion Ring Siberian snake Siberian snake Electron Ring Spin rotators Spin rotators Ion Collider Ring Layout

  5. Design separately and incorporate/match into the ring Vertical chicanes for stacking the ion ring arcs on top of the electron ring Injection section Electron cooling section Siberian snakes Interaction region with horizontal crossing Section for local chromaticity compensation Modular Design Concept

  6. Basic Ring Parameters

  7. Magnet Parameters

  8. /2 betatron phase advance in both planes Magnet parameters for 60 GeV/c protons: Dipoles: length = 3 m bending radius = 38.7 m bending angle = 4.4 bending field = 5.2 T Quads: length = 0.5 m strength = 130 T/m Arc FODO Cell

  9. Quads in 3 FODO cells varied to suppress dispersion while keeping -functions from growing Maximum quad strength at 60 GeV/c = 148 T/m Dispersion Suppressor

  10. Symmetric quad arrangement Initial  values from the dispersion suppressor Quads varied to obtain x,y = 0 in the middle at limited max Maximum quad strength at 60 GeV/c = 130 T/m Short Straight for Siberian Snake

  11. Indicated quads varied to suppress dispersion with limitations on max and Dmax Maximum quad strength at 60 GeV/c = 212 T/m Arc End with Dispersion Suppression Varied quads Regular FODO To straight section

  12. Length = 300.5 m, net bend = 240, average radius = 72 m Complete Arc

  13. /2 betatron phase advance in both planes Drift length chosen to close the ring’s geometry Quad strength at 60 GeV/c = 195 T/m Straight FODO Cell

  14. Four quads in two FODO cells adjusted to match ’s and ’s from arcs to straight’s standard FODO cell Maximum quad strength at 60 GeV/c = 222 T/m Arc to Straight Matching Section

  15. Total length = 1041 m Complete Figure-8 Ring

  16. Figure-8 Ring Layout 100 m

  17. Summary of Optics Parameters

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