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A magnetic cusp gun (MCG) is being developed to generate an axis-encircling electron beam, which is called the large orbit beam, which is going to drive a 0.396-THz fourth-harmonic gyrotron. Developing an MCG imposes crucial challenges on a simultaneously minimizing guiding center deviation and velocity spread of the electron beam, particularly because an ultrahigh magnetic compression ratio is unavoidable,...
The excitation of backward waves in the beam tunnel of a high power gyrotron is considered. Such instability is believed to degrade beam quality and consequently gyrotron efficiency. The instability occurs in a region of the beam tunnel where both the magnetic field and beam tunnel radius are strong functions of axial position. The instability can be suppressed by coating the walls of the beam tunnel...
Summary form only given. The gyrotron is an important source of high power coherent radiation in 100GHz-200GHz range, which is based on the interaction of a spiraling electron beam and a mode of a resonant cavity. As applications call for higher power, higher beam currents are required. Under some circumstances the higher current can lead to an unwanted interaction of the beam with a backward wave...
Gyrotrons are an important source of high power coherent radiation in 100 GHz - 200 GHz range. As applications call for higher power, the power in the beam will increase as the danger of spurious oscillations. Competition between operating modes and competing spurious modes in the interaction cavity is a well studied phenomena, with established methods for suppressing the unwanted modes. Spurious...
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