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.
In order to find the upper limit for mode eigenvalues for stable 1 MW-class gyrotron operation, the behavior of a 236 GHz cylindrical (hollow) cavity gyrotron design is theoretically analyzed for operation with even higher order modes (eigenvalues between 100 and 145). In this frame, two independent methods are used to determine the effect of neighboring modes on mode stability and to estimate the...
Along with high power and high efficiency operation around 240 GHz, the requirements of DEMO gyrotrons include the possibility of multi-frequency operation and fast frequency tunability in 2–3 GHz steps. In this paper, multi-frequency operation of a proposed design for a conventional cavity DEMO gyrotron is presented, including operating parameters at different frequencies. The performance of the...
In this paper, an overall conceptual design of a 170 GHz, 1.5 MW, continuous wave (CW) conventional cavity gyrotron is presented for plasma heating applications in thermonuclear fusion reactors. The operating mode is carefully selected with due consideration of design constraints/goals and mode competition. The ${\rm TE}_{36,10}$ mode is selected as operating mode for the present study. A weakly...
In this paper, the implementation of a phase retrieval algorithm for determining the phase profile of gyrotron output beams from measured intensity patterns at different planes is described along with a novel mode estimation technique based on a surface matching algorithm. A simulated Gaussian beam at different planes is considered as input of the phase retrieval algorithm. The proposed mode estimation...
This prototype antenna design was targeted for WiMAX applications at 5.2 GHz and 5.8 GHz. Patch antenna size reduction is achieved in this work. To realize a dual band operation for WiMAX application at 5.2 GHz and 5.8 GHZ, ground plane loaded with CSSRR has been proposed. The proposed antenna provides good flexibility on selection of dual frequency operation by modifying dimension of CSSRR and patch...
This paper presents the design studies of a 0.5 MW, CW, 42 GHz conventional cavity gyrotron, for plasma heating application in an experimental Tokamak in India. The mode selection process followed by resonator design and RF behavior studies will be presented in this paper.
In this paper, the first hand design of the output system of a 170 GHz, 0.5 MW will be presented. This gyrotron will be used for ECRH/ECCD applications in an experimental Indian Tokamak. The output system of the gyrotron includes a non-linear up-taper, an advanced dimpled-wall quasi-optical launcher and an RF window. All these components are designed and optimized such that a linearly polarized, Gaussian...
A planner, square monopole ultra-wideband (UWB) antenna which is operated successfully on whole UWB range (3.1–10.6 GHz) is proposed with CPW feeding. The antenna has compact size of 28.5 mm × 18 mm × 1.6 mm with substrate relative permeability 3.2. Using Coplanar Waveguide (CPW) resonator, band-notched characteristics is achieved between 5.4–6.3 GHz to reduce the interference with WLAN systems working...
A planner, square monopole ultra-wideband (UWB) antenna which is operated successfully on whole UWB range (3.1–10.6 GHz) is proposed with CPW feeding. The antenna has compact size of 28.5 mm × 18 mm × 1.6 mm with substrate relative permeability 3.2. Using Coplanar Waveguide (CPW) resonator, band-notched characteristics is achieved between 5.4–6.3 GHz to reduce the interference with WLAN systems working...
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.