Rings with 400 and 800 MHz RF

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Rings with 400 and 800 MHz RF

• Ring Cooler Meeting
• Oxford, Ms.
• March 11-12, 2004

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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

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Recalculation with ICOOL V2.66
ICOOL V.266
ICOOL V2.59
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Introduce Skew Quadrupoles

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

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Skew Quadrupoles Performance
Horizontal Focusing
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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
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Strong Focusing Ring Performance
n -0.6 rf at 8 MV/m
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50 Atmospheres Performance
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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

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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

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Strong Focusing Lattice

• Lattice Parameters
• RF at 400 MHz
• 40 Atmospheres GH2
• Aperture 10 cm
• Merit without decay
• B0 2.62 T

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Strong Focusing Lattice (cont)

• Lattice Parameters
• RF at 800 MHz
• 40 Atmospheres GH2
• Aperture 7.5 cm
• Merit without decay
• B0 2.62 T

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Analysis Summary