title: A ferromagnetic shim insert for NMR magnets - Towards an integrated gyrotron for DNP-NMR spectroscopy.
abstract: In recent years high-field Dynamic Nuclear Polarization (DNP) enhanced NMR spectroscopy has gained significant interest. In high-field DNP-NMR experiments (⩾400MHz1H NMR, ⩾9.4T) often a stand-alone gyrotron is used to generate high microwave/THz power to produce sufficiently high microwave induced B1efields at the position of the NMR sample. These devices typically require a second, stand-alone superconducting magnet to operate. Here we present the design and realization of a ferroshim insert, to create two iso-centers inside a commercially available wide-bore NMR magnet. This work is part of a larger project to integrate a gyrotron into NMR magnets, effectively eliminating the need for a second, stand-alone superconducting magnet.
authors.affiliation: Bridge12 Technologies, 37 Loring Drive, Framingham, MA 01702, USA.
authors.forename: Herbert
authors.initials: H
authors.lastname: Ryan
authors.affiliation: Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.
authors.forename: Jan
authors.initials: J
authors.lastname: van Bentum
authors.affiliation: Bridge12 Technologies, 37 Loring Drive, Framingham, MA 01702, USA. Electronic address: http://www.bridge12.com.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Maly
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D008872:Microwaves; D000072176:Superconductivity
keywords: DNP; Dynamic nuclear polarization; Ferroshims; Gyrotron; Two-iso-center magnet