Open Midplane Dipole

Open midplane dipole design is an attractive option when the radiation from the beam inside the magnet (decay particles or synchrotron radiation) are primarily sprayed on the horizontal axis. This situation is faced, for example, in the muon collider dipoles and in the dipole first optics of the high energy hadron colliders. In the conventional design a large shielding system (typically tungsten shield which must be cooled) is placed inside the coil which significantly increases the magnet aperture, several times to order of magnitude. This has a major impact on the magnet cost and complexities. In “a true open midplane dipole” design, as proposed here, most of the radiations are carried outside, well beyond the outer radius of the coil, with absolutely no material on the midplane. Energy deposition on the superconducting coils from the decay particles is made small (including that from the secondary decay particles from the absorber).

This “true open midplane” design differs from the earlier “open midplane” dipole design, where the superconductor at the midplane was merely replaced by the other material. Lorentz forces on the coils closer to the midplane are managed in such a way that those coils are lifted away from the midplane and thus requiring essentially no structure to deal with the vertical Lorentz forces towards the midplane. Earlier designs of the so called “open midplane dipole” didn’t work as well because the replaced material at the midplane would create secondary radiation, a significant part of which would still be deposited in the superconducting coil, reducing the benefit of the open midplane design. This is mostly avoided in a “true open midplane” design.

Following presentations, papers, and SBIR project outlines the study (work in progress) of the open midplane dipole design for the proposed muon collider and for the dipole-first optics which was once proposed for the luminosity upgrade of the Large Hadron Collider (LHC):

  1. R. Weggel et al., “Open Midplane Dipoles for Muon Collider”, 2011 Particle Accelerator Conference, New York (POSTER).
  2. SBIR Phase II Proposal with Particle Beam Laser (PBL), “Development of Open-Midplane Dipole Magnets For Muon Accelerators”, 2011.
  3. High Field HTS Open Midplane Dipole, Muon Collider Physics Workshop, Fermilab, November 12, 2009.
  4. HTS Open Midplane Dipole, 2008 Low Temperature Superconductor Workshop, Tallahassee, Florida, November 11-13, 2008
  5. Open Midplane HTS Dipole SBIR for Muon Collider, PBL Collaboration Meeting at BNL, October 2-3, 2008.
  6. OPEN Midplane Magnets, Muon Collider Design Workshop @BNL, December 3-7, 2007
  7. A Review of Open Midplane Dipole Design Study, LHC IR Upgrade Workshop, St. Charles, IL, USA October 3-4, 2005
  8. R. Gupta, et. al, “Optimization of Open Midplane Dipole Design for LHC IR Upgrade,” Presented at the 2005 Particle Accelerator Conference, Knoxville, TN, USA (2005).      *** Click Here for Poster ***
  9. Open Midplane Dipole, LARP Collaboration Meeting, April 6-8,2005
  10. Conceptual Design of a Smaller Aperture Open Midplane Dipole, LARP Review of Open Midplane Dipole Program at BNL, Dec 14-15, 2004
  11. Dipole for LHC IR Upgrade, LARP Collaboration Meeting, Oct 19-21, 2004
  12. Dipole Design Status, LAPAC Meeting, Companion Talk – Mike Harrison:  Dipole R&D Status and Plans (June 16-17, 2004)
  13. Open Midplane Dipole Design – Status and R&D Issues, LARP Collaboration Meeting at Fermilab, Companion Talk – Mike Anerella:  FY04, 05 Priorities and Plans : BNL  Dipole R&D-Update (2/26/04)
  14. FY04 and FY05 Plans for LARP Magnet R&D at BNL (12/15/03)
  15. BNL LARP Dipole R&D, LARP Collaboration Meeting, Port Jefferson, Companion Talk Mike Anerella on BNL  Dipole R&D, LARP Collaboration Meeting, Port Jefferson (9/17/03)
  16. R. Gupta, et al., “Open Midplane Dipole Design for LHC IR Upgrade,” International Conference on Magnet Technology (MT­18) at Morioka City, Japan (2003) (Click here for Poster)
  17. BNL Magnet Program for LHC Upgrade, Archamps Workshop (3/17/03)
  18. Superconducting Magnets for Neutrino Factory Storage Ring Study 2 (7/9/2001)