We have investigated the nonlinear surface impedance and two-tone intermodulation distortion of ten epitaxial YBa 2 Cu 3 O 7-δ films on MgO substrates, using stripline resonators, at frequencies

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Extraction of highly charged ions (up to 90+) from a high-energy electron-beam ion trap Rev. Sci. Instrum. 73, 30 (2002); An electron-beam ion trap (EBIT) has just been completed in the Clarendon Laboratory, Oxford. The design is similar to the devices installed at the Lawrence Livermore National Laboratory. It is intended that the Oxford EBIT will be used for x-ray and UV spectroscopy of hydrogenic and helium-like ions, laser resonance spectroscopy of hydrogenic ions and measurements of dielectronic recombination cross sections, in order to test current understanding of simple highly charged ions.

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