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 for practical applications in Vacuum Electron Devices (VEDs), the robustness of Scandia Doped Dispenser (SDD) cathodes has been widely concerned. Machinability, emission performance from machined surface, recovery of emission after poisoning; air exposure and ion bombardment have, thereby, been studied. The investigation demonstrated that the cathodes can be successfully machined by normal...
The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. The impregnated cathode prepared with the obtained powders has an excellent emission capability of 121 A/cm2 at 950° b in pulsed condition. The DC life test result indicates that the emission current density of 40 A/cm2 has lasted up to 4000 hours.
High-current-density sheet beams directly generated from scandia-doped dispenser cathodes have been studied for application to vacuum electron devices like terahertz sources. Rectangular beams with current densities of over 50 A/cm2 have been developed and demonstrated to maintain for several hundred hours with the cathode operating stably at 950degCb. Beam forming structures have been investigated...
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.