1 / 9

Quad Channel Cooling Update

Quad Channel Cooling Update. David Neuffer Fermilab. Quad Channel. Previously developed by Makino, Johnstone, Errede, Berz In this study, evaluated for Study 2A compatible case using ICOOL. FODO Study2A. Use 1.5m long cell – FODO lattice 60º to 90º/cell at P  = 215MeV/c

larya
Download Presentation

Quad Channel Cooling Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Quad Channel CoolingUpdate 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 • Elliptical beam profiles

  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 ECALC9 initially used, but ECALC9 valid only for symmetric (x=y) solenoidal lattices. With x-y version of Ecalc9, similar to Study2A To Do Better Matching Extend to Buncher/Rotator ??

  7. Evaluate with x-y emittances • Ecalc9xy written • Separately evaluates εx, εy, x, y, etc. • Acceptance is: • Ax + Ay < ref1, ref2 • with H2 absorber • Same as study 2A baseline • Study 2A acceptance same under ecalc9 and ecalc9xy • LiH absorber • Quad channel, match not well optimized Ecalc9xy quad channel Ecalc9 Study2A 5000 initial particles

  8. Extend to buncher/rotator ? • Try placing solenoid to quad match before buncher • Does not work well • Low-energy beam is immediately lost (E<~80 MeV) (P<150MeV/c) • ~1/2 beam lost in first few meters of buncher • Only ~50% of Study 2A • Quad focusing does not work for very broad energy spread of buncher/rotator • Does work for cooler • Matches energy acceptance quads solenoids

  9. Conference call Meeting

More Related