Abstract
The radial transit time oscillator (RTTO) is promising to realize high power output of millimeter-waves. Although the radial structure can enhance the power capacity, less cavities and small radial dimension make it difficult to improve the power capacity in RTTOs, especially in the extraction cavity. A one-gap extraction cavity in the Ka-band RTTO is proposed in this paper to improve the power capacity. Without electrons, taking the TM011 cavity as an example, the radial reversal resonant electric field can intersect with radial electrons. By choosing the sizes of the cavity, the synchronization of the electrons and the electric field can be realized to achieve effective energy exchange. In particle-in-cell simulation, the RTTO with the TM011 extraction cavity can output 1.0 GW high power microwaves (HPMs) at 31.2 GHz, and the beam-wave conversion efficiency is 31.6%. The maximum electric field in the TM011 cavity is only 800 kV/cm, which is less than one third that in the TM010 extraction cavities. In addition, the TM012 extraction cavity is employed to improve the efficiency to 35.4%. At the same time, because of the increase in the output power, the maximum radial electric field in the TM012 cavity increases to 850 kV/cm. Therefore, the one-gap extraction cavity can realize multiple energy exchanges to get high beam-wave conversion efficiency and enhance the power capacity in the extraction cavity significantly.
Highlights
As the high power microwave (HPM) technology is widely used in many fields, considering the advantages of millimeter-waves, realizing high power millimeter-wave coherent electromagnetic radiation is getting more attention.1–3 the low power capacity and the mode competition restrict the use of axial devices in high power millimeter-wave generation.4–8The radial generator based on the transit-time effect was proposed by Arman.9 In radial lines, as electrons move along the radial direction, the number density will decrease and the space-charge effect will be weakened
The sketch diagram of the radial transit time oscillator (RTTO) with the TM011 extraction cavity is illustrated in Fig. 6, and the most obvious adjustment is that the one-gap cavity is employed to realize the beam-wave intersection
A one-gap extraction cavity is proposed in this paper to enhance the power capacity
Summary
As the high power microwave (HPM) technology is widely used in many fields, considering the advantages of millimeter-waves, realizing high power millimeter-wave coherent electromagnetic radiation is getting more attention. the low power capacity and the mode competition restrict the use of axial devices in high power millimeter-wave generation.. The low power capacity and the mode competition restrict the use of axial devices in high power millimeter-wave generation.. The radial transit time oscillator (RTTO) can realize Ka-band HPMs output and enhance power capacity significantly. The thickness or the axial position offset of the electron beam will not influence the steady operation of Ka-band RTTOs. In addition, change of the radial guiding magnetic field has little effect on the performance, too. Change of the radial guiding magnetic field has little effect on the performance, too With these characteristics, the RTTO is promising to output high power millimeter-waves.. A one-gap extraction cavity is proposed in the giga-watt Ka-band RTTO to enhance the power capacity.
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