Scheme of Alderman-Grant / loop-gap bimodal resonator. Cross-wire surface coil.
Previously, most of the animal work was performed with reflection-type resonators. The refinement of more complex aspects of biology requires higher SNR of EPR measurements. This is possible to achieve with bimodal resonators. Bimodal resonators consist of two independent resonators, which induce mutually orthogonal magnetic fields in the same volume. The Center developed number of designs, the diagram of one of them, Alderman Grant/ Loop Gap animal resonator is shown on the left.
For the Center technology to be applied to human subjects, the surface coils are crucial. In collaboration with Life Services, LLC, Stillwater, MN we developed a 2'' crossed wire resonator. At this early stage, isolation of nearly 40 dB have been achieved.