title: Energy efficient iron based electronic field cycling magnet.
abstract: A new concept for an energy efficient electromagnet for fast field cycling NMR applications as well as its construction and first test results are presented. The magnet, which provides a rectangular sample space of 17 x 25 mm, has an iron yoke and pole pieces optimised with respect to the B(0) homogeneity. The maximum field is 0.66 T at a current of 320 A; its field inhomogeneity for a cylindrical sample (length 7 mm, diameter 6mm) is about 50 ppm. The power dissipation during polarisation at 0.55 T is as low as 1.4 kW. The magnet is powered by a commercially available power supply and can be rapidly switched with a slew rate of 0.55 T/ms. The system has shown a stability of 50 ppm/h.
authors.affiliation: Institut für Festkörperphysik, TU Darmstadt, Hochschulstrasse 6, 64289 Darmstadt, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Plendl
authors.forename: Marian
authors.initials: M
authors.lastname: Fujara
authors.forename: Alexei F
authors.initials: AF
authors.lastname: Privalov
authors.forename: Franz
authors.initials: F
authors.lastname: Fujara
mesh_terms: D000465:Algorithms; D000497:Alloys; D003246:Conservation of Energy Resources; D004574:Electromagnetic Fields; D007501:Iron / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*
chemical_list: D000497:Alloys; D007501:Iron