Abstract
Conditions of backward wave oscillations have been modeled in a in a Helix TWT based upon the two wave theory. The case of both a tapered and un-tapered helix structure have been studied to find the dependence of the start oscillation current on different design parameters. A 140 Watt, Ku-Band, Space TWT has been analyzed for different design parameters and the beam voltages to calculate the start oscillation current in the different sections taking actual pitch profile. The start oscillation current is the most critical parameter regarding the backward wave oscillations and hence in ensuring the stability of a high gain TWT
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