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Its diagnostics and consequence are discussed together with a new scheme leading towards the goal, an efficient injection of helicity (or helical electron-beam) into the potential-well conserved orbitron interation region. Further problem of conventional orbitrons is in its construction in which the potential-well is prematurely destroyed due to the shortening discharge current. Experimental results are described on employment of a tapered metal-end, tangential injection of a thin electron beam, axial injection of rotating annular electron beams, and application of external magnetic fields. This paper discusses various ways to enhance the efficiency and absolute power of an orbitron millimeterwave source. The axisymmetric injection is also a problem 50% of electrons would be lost directly to the anode by the head-on collisions. Only the electrons who did not suffer collisions till the radius 2/3 of the outer conductor (cathode) radius are possible to acquire the azimuthal velocity, via collisions, as large as the critical velocity with which the electrons can undergo circular equilibrium orbits.
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In such a scheme, however, more than half of the electrons would not participate in the orbital motion around the anode due to the lack of acceleration. Once the car is restored to its former glory, Orbitron will join other Ed Roth cars in the Galpin Collection, including the Rotar (Roth Air Car) that was built.
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Conventional orbitrons utilize the radially injected electrons for production of electromagnetic waves.
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