by Staff Writers
Washington DC (SPX) Feb 12, 2015
High-power microwaves are frequently used in civil applications, such as radar and communication systems, heating and current drive of plasmas in fusion devices, and acceleration in high-energy linear colliders.
They can also be used for military purpose in directed-energy weapons or missile guidance systems. In a new study published in EPJ D, scientists from Bangladesh demonstrate that their proposed novel method, which is capable of producing such microwaves, offers a viable alternative to traditional approaches. The solution was developed by Md. Ghulam Saber and colleagues from the Islamic University of Technology in Gazipur, Bangladesh.
To generate such high-power microwaves, researchers rely on devices referred to as backward wave oscillators, which are designed to transform the energy of an intense electron beam into electromagnetic radiation at microwave frequencies.
The electron beam propagates axially through what is referred to as a slow electro-dynamic structure - SWS for short. The latter is designed to slow down the electromagnetic wave to phase velocities less than the speed of light.
Only then can the wave interact with the electron beam in a resonant manner. This interaction, in turn, leads to an instability, which is the prerequisite for energy transfer from the electron beam to the electromagnetic wave, and for turning it into high-power microwaves.
Metallic cylinders with a sinusoidally shaped, periodically corrugated inner wall are being extensively used as SWS. The trouble is that they are difficult to manufacture, and require sophisticated numerical machines to design.
To overcome this issue, the authors propose an alternative shape of the SWS, in the form of a novel semi-circular structure. They employ numerical techniques to model the dynamics of this structure, and prove that it is a viable alternative for generating high-power microwaves.
Islamic University of Technology
Powering The World in the 21st Century at Energy-Daily.com
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.|