1 / 24

Quadrupole Magnetic Design for an Electron Ion Collider

Quadrupole Magnetic Design for an Electron Ion Collider. Paul Brindza May 19, 2008. Achieving Small Crossing Angles. Achieving small crossing angles requires a creative sharing of space inside SC quads with the nearby Ion or Electron beams

minya
Download Presentation

Quadrupole Magnetic Design for an Electron Ion Collider

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. Quadrupole Magnetic Design for an Electron Ion Collider Paul Brindza May 19, 2008

  2. Achieving Small Crossing Angles • Achieving small crossing angles requires a creative sharing of space inside SC quads with the nearby Ion or Electron beams • It seems advantageous to place the smaller lower field final focus electron quads closest to the interaction point • Realistic design considerations of SC quads drives solutions where the ions or electrons must pass through the quad force collar or cold yoke structures

  3. Electron Quad Design Choices • Reaching small crossing angles requires a “hole” in the SC magnet structure to pass the Ion beam • A “traditional” Cosine 2 Θ Quad with a non- magnetic force collar near the coil has residual field along the Ion trajectory • Due to lower fields in the Electron Quad the iron yoke/force collar can be adjacent to the coil

  4. Ion Quad • Cosine 2Θ type SC quad operating at 2 Kelvin due to high field and high current density • Non magnetic force collar adjacent to coil • Hole to pass Electron beam in cold yoke or in force collar with a magnetic shield • Magnetic Design was performed with TOSCA

  5. Properties of Electron and Ion Quads

  6. Head on View of Electron QuadTosca Model

  7. Model tipped by 19 mR

  8. Gradient in Electron Quad64 T/m and 72 (T/M)M

  9. Harmonics for E quad

  10. Field in Ion pass thru hole

  11. Field in Ion pass thru hole

  12. The Ion Quad for the Electron Light Ion Collider

  13. Ion Quad Considerations • High Gradient of 220 T/m , high current density 37KA/cm^2 and 8Tesla fields require operation at or near 2 Kelvin • This permits use of NbTi SC cable • Conventional Cosine 2Θ magnet geometry • LHC experience with high gradient quads will be a valuable guide for design • Force collar pressure due to magnetic forces is 6370 psi

  14. Cross section of quad with electron pass thru

  15. Field magnitude in coil and force collar

  16. Gradient of Ion quad220 T/M and Integral G.dL = 250 (T/M)M

  17. Plot of By on 2.5 cm radius in main aperture

  18. Field harmonics in Ion quad

  19. Field Magnitude in cold yoke

  20. Integral By.dL along length of electron pass thru (8,000 gauss cm)

  21. Field in electron pass thru By component

  22. Harmonics of By on 1.3 radius in electron pass thru

  23. Ion Quad Peak Field Load Lineand NbTi SC Cable Short Sample CurveSSC outer cable used for comparison

  24. Conclusions • Lambertson type quads are feasible for the final focus magnets for ELIC • Locating the Electron quads closest to the crossing point allows a smaller crossing angle. • ELIC quads require beam pass thru holes in the quad structural elements • NbTi SC cables can be used in the ELIC quads however the Ion quads must operate at 2 kelvin

More Related