The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
MILO has been analyzed for its beam wave interaction and the RF released energy has been calculated. The analytical results are obtained, typically, for a S-band MILO, and released RF energy is found as 2.5 Joule at 300 kV applied voltage. The analytical results has also been validated through PIC simulation code MAGIC and found to be in close agreement.
This paper will describe the new capability in BOA, the heat transfer integration with particle simulations. It will discuss implemented techniques to smooth the wall power density field generated by electron energy. It will explain the finite element method with adaptivity used to solve the heat equation, and provide numerical results to demonstrate the implementation.
An analysis of an iron pole piece PPM code based on the Finite Element Method (FEM) for traveling-wave-tube (TWT) design is presented. The XMAGUN was developed to determine the axial and radial magnetic fields inside such devices. During simulations, the outer pole piece radius was varied and, as a result, it was obtained a growth of the axial peak magnetic field value when the outer pole piece radius...
The large-signal code TESLA (Telegraphist's Equations Solution for Linear-beam Amplifiers) was originally developed for the analysis and design of klystrons. It has now been applied to the simulations of an extended interaction klystron (EIK) for the first time. Results for the power transfer curve and bandwidth curves computed for a G-band EIK compare well to their measured values. TESLA obtains...
This paper presents a study on the mechanism of electronic emission by constructing electronic spread launching model and solving Poisson equation analytically between two planar plane. The results show that electron beam introduces periodic and non-periodic perturbation to primary vacuum potential. The overall effect of periodic perturbation can be ignored because of symmetry but non-periodic perturbation...
Traveling-wave tubes (TWTs), used in civil and defence applications, require high power and multi-octave bandwidth rather than high efficiency and hence just a single stage depressed collector is sufficient. However, TWT used in space applications necessarily has to have very high efficiency rather than wide bandwidth. A user friendly multi-stage depressed (MDC) collector design code in MATLAB for...
This paper describes a simple, fast and accurate method for the design of coupler for helix TWTs, using a simulation approach. It shows that a coupler can be analysed and optimized without modelling of a matching attenuator or user generated perfect matched boundary at the sever end. The proposed method not only considerably reduces the computational time but also provides exact results for the coupler...
Parasitic mode suppression was studied by the electromagnetic theory. The method of increasing the frequency interval (FI) between operating mode and parasitic mode was proposed to suppress the unwanted mode. In order to increase FI, a pair of metal rings (MR) is installed in the coaxial resonator operating at high-order-mode for multi-beam klystron (MBK). A TM310 mode coaxial resonator has been manufactured...
This paper describes a 402.5 MHz 140 kW Inductive Output Tube (IOT) that is being developed for use in proton accelerators. New, more efficient, computer codes will be used to simulate the time dependent behavior of the IOT. The principal components of the device, including the RF structure, electron gun, and magnetics are described.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.