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6D Cooling with a Rectilinear FOFO Channel

6D Cooling with a Rectilinear FOFO Channel

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6D Cooling with a Rectilinear FOFO Channel

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  1. 6D Cooling with a Rectilinear FOFO Channel Diktys Stratakis Brookhaven National Laboratory AAC Group Meeting July 18, 2013

  2. Outline & History • At the MAP meeting it was decided to abandon the Guggenheim helical channel • It was recommended to focus on the Rectilinear_FOFO or snake channel • It was suggested to use the new 325 MHz/ 650 MHz/ 975 MHz sequence • Deliver a front-to-end simulation by beginning of FY2014 • Today, I will present preliminary results on 6D cooling with a Rectilinear_FOFO scheme 2

  3. 6D cooling baseline for a MC This Study • I start at the post-merger: • I like to see if the R_FOFO scheme works • Test the behavior of 325 MHz/ 650 MHz/ 975 MHz • Define parameters needed 3

  4. Lattice Visualization TOP VIEW • A rectilinear channel with tilted alternating solenoids and wedge absorbers SIDE VIEW SIDE VIEW 4

  5. Simulation Details • Lattice simulated with ICOOL • 16 stages with progressive decrease of beta function • Early: β=40 cm, Late: β=4.0 cm • Coils tilted by 1.1 to 1.3 deg. to generate dispersion • Liquid Hydrogen wedge for cooling. Absorber and rf windows included. • Two frequencies: 325 MHz & 650 MHz • Start with 100,000 particles • All stages are in a single deck that can be easily adjusted if the input distribution changes SIDE VIEW 5

  6. Lattice Visualization (Last Stage) • Last 7 stages have the same configuration • Coils are tilted by 1.1 deg. (not shown) 6

  7. Lattice Details

  8. Particle Tracking • Comparable (but not so good) as a Guggenheim 1.6 0.32 8

  9. Quality Factor Qmax=9.5 (R_FOFO) Qmax=11.0 (Guggen)

  10. B-Field Requirement • The maximum peak B-field is 14.5 T with 196 A/mm2 • Nb3Sn seems a good candidate. 94.69.83.62

  11. Work Plan • Diktys, almost finished the post-merge • Diktys, will work on the pre-merge • Bob, will work on the bunch merger • Charge separator? Bob and Diktys?

  12. Pre-Merge (Preliminary) • Beam distribution after the phase-rotator of the 325 MHz front-end:

  13. Lattice Performance