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Rings with 400 and 800 MHz RF

Rings with 400 and 800 MHz RF. Ring Cooler Meeting Oxford, Ms. March 11-12, 2004. Gas Filled Dipole Wedge Rings. Key parameters at r = 60 cm b x = 53 to 72 cm ; b y = 60 to 64 cm Dispersion = 60 to 64 cm Circumference = 3.91 m.

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Rings with 400 and 800 MHz RF

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  1. Rings with 400 and 800 MHz RF Ring Cooler Meeting Oxford, Ms. March 11-12, 2004

  2. Gas Filled Dipole Wedge Rings • Key parameters at r = 60 cm • bx = 53 to 72 cm ; by = 60 to 64 cm • Dispersion = 60 to 64 cm • Circumference = 3.91 m

  3. Recalculation with ICOOL V2.66 ICOOL V.266 ICOOL V2.59

  4. Introduce Skew Quadrupoles • Bracket dipoles with thin (3cm) skew quadroles • Skew quadrupoles real estate at 9% circumference • Test various gradients. • X/Y Coupling achieved

  5. Skew Quadrupoles Performance Horizontal Focusing

  6. An FFAG-like Lattice • Lattice consists of alternating • Horz. Defocusing and Horz. • Focusing with LHD = ½ LHF . • No drift cells between dipole • elements. Parameters 12 cells Bend angles 30o and –15o Circumference = 6m Bo = 2.6T and Po = 250 MeV/c Dispersion = 25 cm

  7. Strong Focusing Ring Performance n = -0.6 rf at 8 MV/m

  8. 50 Atmospheres Performance

  9. A Demonstration Scenario • Merit factor of ~ 10 is sufficient • Muon decay ignored • Rf frequency at 800 MHz • Beam aperature at ±7 cm • Gas density at 10 atmos at 77o K • DC dipole field at 1.5T • Pulsed dipole field ~ 3T

  10. Weak Focusing Lattice • Lattice Parameters • Skew Quads at 1.5 T/m • RF at 400 MHz • 40 Atmospheres GH2 • Aperture ± 10 cm • Merit without decay • B0 = 2.62 T

  11. Strong Focusing Lattice • Lattice Parameters • RF at 400 MHz • 40 Atmospheres GH2 • Aperture ± 10 cm • Merit without decay • B0 = 2.62 T

  12. Strong Focusing Lattice (cont) • Lattice Parameters • RF at 800 MHz • 40 Atmospheres GH2 • Aperture ± 7.5 cm • Merit without decay • B0 = 2.62 T

  13. Analysis Summary

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