Title :
Experimental Study of Phase Pushing in a Fundamental-Mode Multiple-Beam Klystron
Author :
Abe, David K. ; Pershing, Dean E. ; Nguyen, Khanh T. ; Myers, Robert E. ; Wood, Franklin N. ; Levush, Baruch
Author_Institution :
U.S. Naval Res. Lab., Washington, DC
fDate :
5/1/2007 12:00:00 AM
Abstract :
The authors present the results of experimental measurements of the radio frequency phase as a function of cathode voltage for an eight-beam four-cavity multiple-beam klystron (MBK) operated at a driven frequency of 3.25 GHz. The phase-pushing factor was measured in both the small- and large-signal regimes of amplifier operation and was found to be 0.0134deg/V and 0.0148deg/V, respectively. The experiment was also modeled with a simple analytic function and with telegraphist´s equations solution for linear beam amplifiers, a multiple-beam 2.5-D nonlinear klystron code, with both methods yielding good agreement with the measured data. The low values for the phase-pushing factor are a benefit of the MBK´s high-perveance operation that results in a shorter circuit length relative to single-beam devices of comparable power. These advantages contribute to the growing interest in the use of multiple-beam devices for high-power phase-sensitive applications such as advanced radar and high-data-rate digital communications
Keywords :
klystrons; microwave tubes; 3.25 GHz; digital communications; linear beam amplifiers; multiple-beam klystron; phase-pushing factor; Cathodes; Circuits; Frequency measurement; Klystrons; Nonlinear equations; Operational amplifiers; Phase measurement; Radio frequency; Radiofrequency amplifiers; Voltage; Multibeam; multiple-beam amplifier (MBA); multiple-beam klystron (MBK); phase pushing; pushing factor;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2007.894240