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Quad Channel Cooling

This study, conducted by David Neuffer at Fermilab, evaluates the Quad Channel Cooling system using ICOOL for the Study 2A compatible case. The work builds upon earlier developments by researchers such as Makino and Johnstone. Employing a 1.5m long FODO lattice cell with specific parameters (60º–90º/cell at Pμ=215 MeV/c), it examines the advantages and disadvantages of Quad Channel Cooling, including cost benefits and reduced breakdown issues but limited low β* regions. This evaluation aims to optimize cooling strategies for future applications.

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Quad Channel Cooling

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  1. Quad Channel Cooling David Neuffer Fermilab

  2. Quad Channel • Previously developed by Makino, Johnstone, Errede, Berz • In this study, evaluated for Study 2A compatible case using ICOOL

  3. FODO Study2A • Use 1.5m long cell – FODO lattice • 60º to 90º/cell at P = 215MeV/c • max = 2.6m;min=0.9 to 0.6m • B’ = 4 to 6 T/m

  4. Simulation Results • Cooling in FODO cells • 2 1cm LiH slabs • Gas H2

  5. Advantages of Quad Channel • No large magnetic fields along the axis • Reduced breakdown problems • Magnets much cheaper • No Amplitude–Momentum correlation in Cooling • No beam angular momentum effects • No preferred absorber location (gas cavity OK) Disadvantages of FODO Quad channel • No low * region • Relatively weak focusing

  6. Use in Study2A? • Replace Cooler with FODO cooler • Solenoid to lattice “match” with 4 quads, ~2m (not well-optimized) With H2 absorbers, similar to Study 2A LiH performance (~10% worse) ECALC9 used, but ECALC9 valid for symmetric (x=y) solenoidal lattices. Would like to use quad lattice in Buncher and Rotator for comparisons To Do Better Matching Extend to Buncher/Rotator

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