Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 48: Preparation and characterization
HL 48.5: Vortrag
Donnerstag, 30. März 2006, 16:15–16:30, POT 151
A Cryogen Free Magnet For Use In EPR — •Jeremy Good1, Renny Hall1, and A. I Smirnov2 — 1Cryogenic Ltd, 30 Acton Park Industrial Estate, London W3 7QE, UK — 2Department of Chemistry, North Carolina State University, Raleigh, NC, 27695-8204, USA
Cryogenic has built a new type of Cryogen Free Magnet for use in EPR experiments. A novel design of sweep coil allows precise field sweeps to be made with very low inductive coupling to the main coil. Measurements using NMR at high field have confirmed the improved precision of this arrangement.
In addition, the main coil can be swept rapidly over the full range of field to detect broad resonances and without the use of any liquid helium which makes for very economic operation. For the highest feilds fo 14 Tesla, the magnets operate in dry mode with the magnet cooled directly by a Gifford McMahon (GM)cold head. Field stability of 10-7 per hour in persistent mode is now also obtained using truly superconducting joints between both the NbTi and NbSn conductors.