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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 Vasiliy Morozov for the JLab EIC Study Group
MEIC Layout Prebooster 0.2GeV/c 3-5 GeV/c protons Big booster 3-5GeV/c up to 20 GeV/c protons 3 Figure-8 rings stacked vertically
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
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
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
/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
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
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
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
Length = 300.5 m, net bend = 240, average radius = 72 m Complete Arc
/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
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
Total length = 1041 m Complete Figure-8 Ring
Figure-8 Ring Layout 100 m