A transition between a coaxial line and a bi-periodic structure has been designed. Also considerable work has been done on an electron gun to achieve spiral motion of electrons in a hollow beam. Several possi¬bilities have been investigated. In the most promising device, the "spiral lens", potential energy is converted into rotational kinetic energy whereas the axial kinetic energy is not influenced by the lens. An experimental tube for the investigation of crossed-field flow and which employs a spiral lens, has been built and is about ready to be tested.
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