Novel horizontal-bore superconducting solenoid design for quasioptical high-field electron paramagnetic resonance

Abstract

A horizontal-bore magnet and cryostat design is described that is specifically adapted to high-frequency quasioptical electron paramagnetic resonance (EPR). The magnet is an 8-T superconducting solenoid with an auxiliary superconducting sweep coil driven by permanently mounted current leads. The performance of the sweep magnet in this configuration is demonstrated using a lithium phthalocyanine single crystal standard, which gives peak to peak first derivative linewidths down to 19 μT. The specific advantages of the horizontal-bore swept-field design for quasioptical EPR include improved accessibility, sensitivity, and economy of operation compared with vertical-bore magnets. © 2002 Wiley Periodicals, Inc.