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An improved approach for predicting the armature reaction field in Permanent-Magnet AC (PMAC) machines is presented, and eddy current reaction is take into account. Winding configuration of PM machines could be various, such as concentric winding or lap winding, integral or fractional slot winding, distributed or concentrated winding, single-layer or double-layer winding. Starting with the field produced...
A self-designed helicon wave plasma (HWP) source with an internal "right-hand" helical antenna driven by a 13.56MHz radio-frequency (RF) source is investigated for its possible use for processing wall material in future magnetic fusion devices. The plasma beam is ejected into a larger diffusion chamber, where the ion energy distribution and electron energy distribution are measured by commercial...
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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