High efficiency multiple beam klystron (MBK) stability

Lingwood, Christopher James; Carter, Richard G.

doi:10.1109/ivelec.2009.5193504

Cited by 2 publications

(2 citation statements)

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“…An EIK is susceptible to unwanted oscillations from a greater section of modes than conventional klystron.the beam may couple with azimuthally and shortly distance between the gaps varying modes which a common tube can not as there is little electric field at the beam pipe. The Wakefield theory can be used to calculate the excitation of a cavity by a beam [4] .This allows modes such as the dipole mode in the extended interaction output cavity to be evaluated and other troublesome modes identified which can then be damped or perturbed.Monotron oscillation occurs when the beam gives to the RF structure more power than can be dissipated. There are two conditions that must be met for oscillation to take place,The beam loading conductance (G e ,which is proportional to df/f)must be negative,This calculation define the range of potential dangerous frequencies.…”

Section: Structure and Theory Analysismentioning

confidence: 99%

“…There are two conditions that must be met for oscillation to take place,The beam loading conductance (G e ,which is proportional to df/f)must be negative,This calculation define the range of potential dangerous frequencies. The Q 0 factor of one of these modes must be greater than a critical value which is proportional to beam parameters(V 0 ,I 0 ,G e ) and the R/Q of the mode [4] . Fig.3 and Fig.4 is electric field contour and electric field magnitude in the axial distribution, respectively.…”

Section: Structure and Theory Analysismentioning

confidence: 99%

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Stability analysis of W-band extended interaction output cavity

Zhong¹,

Wang²

2014

IEEE International Vacuum Electronics Conference

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In this paper, a novel w-band extended interaction output cavity stability analysis is presented. Adopting beam quality factor and PIC code, stability analysis of the eight ladder grids cavity is discussed for the 2π operation mode. Results show that reasonable beam quality factor can reach more stable output power without oscillation of parasitic mode. IntroductionAlong with the development of sciences and technologies, many today's and future applications, such as medicine , biology, communications, active denial, atmospheric sensing and near-object analysis, require radio frequency (RF) sources producing the microwave power of several watts to several kilowatts in the Terahertz range [1][2][3] . Extended Interaction Klystron,based on an extended interaction structure,are a way to achieve high power,wide bandwith and high gain in the millimeter/sub-millimeter wave length range,the ladder cavity structure is composed of several coupled-cavities that strongly couple to each other by the slots on the common walls between the adjoining cavities.So It is very important to keep stability of analysis (cold and hot test) for the structure, Adopting beam quality factor and PIC code, stability analysis of the eight grids cavity is discussed for the 2π operation mode. Results show that reasonable beam quality factor can reach more stable output power without oscillation.

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Section: Structure and Theory Analysismentioning

confidence: 99%

Section: Structure and Theory Analysismentioning

confidence: 99%