Requirements and Conceptual Superconducting Magnet Design for a 21 T Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
The National High Magnetic Field Laboratory (NHMFL) has identified as one of its next high-field persistent-magnet targets a 21 T superconducting magnet system to be used in a Fourier Transform Ion Cyclotron Resonance (FT-ICR) Mass Spectrometer. The required fundamental parameters of a 21 T central field and 110 mm warm bore diameter are similar to those already successfully demonstrated in the NHMFL's Ultra-Wide Bore 900 MHz Nuclear Magnetic Resonance magnet system. However, there are several ancillary requirements of the FT-ICR spectrometer that require technical attention such as fringe field restrictions requiring shielding, length of uniformity zone, magnitude of inhomogeneity, horizontal orientation of the magnet axis and a limitation on the length of the cryostat. This paper describes the overall system requirements, features and status of the superconducting magnet conceptual design proposed for meeting these requirements
Epoxy lead cones for free supported leads
The support of lead wires at the lead exits of epoxy impregnated coils can be an important aspect of the coil design. This is especially true for coils fabricated of the brittle high field superconductors including both the metallic and the oxide superconductors. There is potential damage to a lead wire due to the local Lorentz force and also due to the relative motion of the coil and surrounding support structure, if that relative motion results in mechanical stress on the lead. An extension of the free floating coil concept for epoxy impregnated coils is the free supported lead concept. A free lead is connected to the coil itself and moves with the coil. A free lead is free of rigid connection to the coil supporting structure when that connection can result in stress on the lead. A critical part of the free supported lead is the lead exit from the windings. Support of the lead wire at the lead exit may be accomplished by extending the epoxy-fiber structure of the winding region into a bonded structure that encapsulates and supports the lead exit. The resulting bonded structure tends to be in the shape of a cone. The lead cone concept is introduced through design and processing. The results of a stress analysis are described. Available mechanical test data on model structures are presented.
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