The Superconducting Horizontal Bend Magnet for the Jefferson Lab's 11 GeV/c Super High Momentum Spectrometer

• Published in: IEEE transactions on applied superconductivity 2010-06, Vol.20 (3), p.226-229
• Main Authors: Chouhan, Shailendra, DeKamp, Jon, Zeller, Al, Brindza, Paul, Lassiter, Steve, Fowler, Mike, Sun, Eric
• Format: Article
• Language: English
• Subjects: Angles (geometry); Applied sciences; CABLES; Coiling; Collaboration; Cryostat; DESIGN; Design engineering; dipole magnet; DIPOLES; Electrical engineering. Electrical power engineering; Electromagnets; Exact sciences and technology; FIBERGLASS; Field strength; Geometry; Glass fiber reinforced plastics; Horizontal; IRON; MAGNET COILS; MAGNETS; Mechanical factors; Optical fiber cables; Optical fiber testing; PARTICLE ACCELERATORS; RESTRAINTS; SPECTROMETERS; Spectroscopy; Superconducting coils; Superconducting magnets; SUPERCONDUCTING SUPER COLLIDER; Superconductivity; superferric; Various equipment and components; warm iron; Wounds
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2009.2038715

A collaboration between NSCL and Jlab has developed the reference design and coil winding for Jlab's Super High Momentum Spectrometer (SHMS) horizontal bend magnet. A warm iron ¿C¿ type superferric dipole magnet will bend the 12 GeV/c particles horizontally by 3° to allow the SHMS to reach angles as low as 5.5°. This requires an integral field strength of up to 2.1 T.m. The major challenges are the tight geometry, high and unbalanced forces and a required low fringe field in primary beam path. A coil design based on flattened SSC Rutherford cable that provides a large current margin and commercially available fiberglass prepreg epoxy tape has been developed. A complete test coil has been wound and will be cold tested. This paper present the modified magnet design includes coil forces, coil restraint system and fringe field. In addition, coil properties, quench calculations and the full mechanical details are also presented.