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.
The design of a W-band second harmonic gyrotron based on a 1.8 T continuous operation solenoid is presented. A compact triode MIG is designed to generate gyrating electron beam. The gyrotron operates at the TE0,2 mode with a conventional cylindrical cavity. And we designed a high efficiency quasi-optical mode converter with a dimpled wall laucher, the mode conversion efficiency is 97% and the Gaussian...
Backward-wave oscillator (BWO) is a promising candidate as a millimeter-wave and submillimeter-wave (MMW/SMMW) power source and has a compact configuration, moderate output power, and frequency-tuning abilities. The physical conditions for increasing the threshold current of a typical MMW/SMMW-BWO are theoretically studied in this paper. We demonstrate the greater effect of axial phase velocity variation...
This paper described the 3D simulation method and results of electron gun and beam transport for the 0.14THz TWT with the help of CST. The hot test results show that the design of the electron beam optics system satisfied the need of the TWT. It bases the manufacture of the 0.14THz travelling wave tube.
This paper introduces the design method of the electron optical system for a 0.22THz folded waveguide traveling wave tube. As the electron beam current is 10mA and the beam channel radius of the tube is only about 0.1mm, the PPM(period permanent magnet) focusing system needs to be carefully designed to transmit this beam current from the electron gun to the collector. A tree-electrode Pierce gun is...
The design of a W-band gyrotron operating at the third harmonic cyclotron frequency is presented. In order to tackle the mode competition problem, a cylindrical cavity with an iris structure is used. The gyrotron is designed to operate at the low loss, circular symmetric TE02 mode. When the gyrotron is driven by a 45 kV, 4 A electron beam with orbital-to-axial velocity ratio equal to 1.5, an output...
The latest development of 220 GHz folded waveguide (FW) backward wave oscillator (BWO) is presented here. The pill-box window system, beam optical system (BOS), slow wave structure (SWS) have been designed, machined and tested. However, the collector current of the prototype tube can just reach 13 mA with the emission current of 22 mA due to the imperfection of the structure and magnetic field, where...
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.