| http://www.w3.org/ns/prov#value | - Still referring to the embodiment of FIGS. 1, 2 and 2A cavity 10, including shielding 32 and endwall 16, is formed of metal but preferably comprises a diamagnetic material such as copper or silver, rather than a ferromagnetic material, so that a modulating magnetic field can be used in connection with cavity 10.
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