Simulation of a rising sun magnetron employing a faceted cathode with a continuous current source
- Title
- Simulation of a rising sun magnetron employing a faceted cathode with a continuous current source
- Author
- Ming-Chieh Lin
- Keywords
- Electrodes; Field emission; Field emission cathodes; Magnetrons; Thermionic cathodes; Cathode geometry; Cathode voltages; Current injections; Device performance; Magnetron operations; Particle in cell codes; Rising-sun magnetrons; Strong currents
- Issue Date
- 2014-10
- Publisher
- American Vacuum Society
- Citation
- Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics, 2014, 32(6), P.061205-1~061205-6
- Abstract
- It has been proposed that gated field emitters could be used in place of conventional thermionic cathodes to control the current injection in a magnetron, both temporally and spatially. Since gated field emitters have to be fabricated on flat surfaces, a faceted cathode would be used to implement this approach. A 2D ten cavity, rising sun magnetron has been modeled using the particle-in-cell code VORPAL. Cylindrical, five-sided, and ten-sided faceted cathodes were modeled to study the variation of magnetron operation due to the cathode shape. This work shows the results of the device performance employing three different cathode geometries with a typical continuous current source. The cathode voltage is -22.2 kV; magnetic field is 0.09 T; and linear current density is 326 A/m. The three models oscillated at the pi-mode, at a frequency of 960 MHz for the cylindrical cathode and 957 MHz for the faceted cathodes. Simulations show a faster start up time for the ten-sided faceted cathode. This resulted in a reduced overall startup time of the device from 200 to 110 ns. A strong current instability was observed in the five-sided cathode case with a periodicity range from 250 to 350 ns. This instability was limited to the start-up period of the ten-sided cathode model; hence the ten-sided case was more stable. (C) 2014 American Vacuum Society.
- URI
- http://avs.scitation.org/doi/10.1116/1.4900636http://hdl.handle.net/20.500.11754/52076
- ISSN
- 1071-1023; 2166-2746
- DOI
- 10.1116/1.4900636
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML