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A modified Mims-style transmission resonator for low frequency pulsed electron spin resonance

The Mims cavity is an effective sample resonator for pulsed ESR at low temperature because of its low quality factor and high filling factor. Its size, however, is inherently linked to the waveguide dimensions of the frequency band of operation, and the operation of such a conventional unit below X-band is therefore impractical because the entire structure must reside within a helium cryostat (Dewar flask). A modified version of the Mims cavity is described that is based on ridged waveguide transmission line feeds while retaining the lambda /2 resonant strip. The modified transitions reduce the cavity dimensions to 4 cm*4 cm, thereby greatly facilitating compatibility with a liquid helium immersion Dewar flask while extending the operating frequency range downwards to 4.75 GHz.