Structural Analysis of the SHMS Cosine Theta Superconducting Dipole Force Collar

Journal Article · Tue Jun 23 00:00:00 UTC 2009 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/tasc.2009.2019222 · OSTI ID:980904

Lassiter, Steven ^[1]; Brindza, Paul ^[1]; Fowler, Mike ^[1]; Sun, Eric ^[1]; Markham, Greg ^[2]

---

1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Nova Tech, Lynchburg, VA (United States)

Jefferson Laboratory is developing a set of innovative superconducting magnets for the 12 GeV upgrade in JLAB Hall C. Here, we will report on the finite element analysis (FEA) of the force collar for the Super High Momentum Spectrometer Cosine Theta Dipole magnet. The force collar is designed with an interference fit and intended to provide enough pressure after cool down to operating temperature to counteract Lorentz forces acting on the dipole coil during operation. By counteracting the Lorentz forces and keeping the coil pack in overall compression, movement of the coils is expected to be minimized. The dimensional geometry of the cold mass is maintained in the commercial solid modeling code UG/I-DEAS while the magnetic field design is maintained in the commercial TOSCA code from Vector Fields. The three dimensional FEA was conducted in the commercial codes ANSYS and IDEAS. The method for converting the models and calculating the loads transferred to the structure is discussed. The results show the cold mass response to: force collar assembly preload, differential thermal contraction, and operational Lorentz loads. Evaluations are made for two candidate force collar materials and two candidate force collar designs.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC05-06OR23177
• OSTI ID: 980904
• Report Number(s): DOE/OR/23177-0938; JLAB-PHY--09-1041
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 3 Vol. 19; ISSN 1051-8223
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English