Events

July 25, 2012

Air Force hosts noted directed energy scientist at anniversary celebration

by Robert P. White, Ph.D.
Air Force Office of Scientific Research, Arlington, Va.

July 18, the Air Force Office of Scientific Research in Arlington, Va., hosted a presentation by noted directed energy researcher Dr. Edl Schamiloglu, Professor of Electrical and Computer Engineering at the University of New Mexico in Albuquerque.

Schamiloglu’s presentation was part of a continuing series of events planned throughout the year as part of AFOSR’s 60th anniversary celebration.

Schamiloglu was the eleventh guest speaker in this series, and his presentation, Directed Energy Microwave Research: Virtual Prototyping and the Paradigm Shift, was an informative and entertaining overview of high power microwave research.

Having been studied for more than 40 years, high power microwave research is a relatively new field, originally beginning with researchers in the United States and the former Soviet Union who dominated the effort. Today, dozens of countries are actively pursuing programs in developing such sources. Early developments in the field were motivated by researchers developing sources with ever-greater output power levels and longer pulse durations (greater energy).

But interestingly, the period from the 1970s to the mid-1990s, which was dominated by the pursuit for greater and greater power levels, ran headlong into the phenomenon of pulse shortening, which was recognized as a fundamental barrier to this approach. In effect, pulse shortening is an operational barrier which severely limits HPM output pulse length and thus the amount of energy radiated. It was this limit on radiated HPM energy that forced researchers to regroup and to pursue other avenues of approach. Or as Schamiloglu described it, “moving away from the ‘flamethrower’ mentality,” and realizing that HPM power alone might not be sufficient, and that the emphasis should be on the establishment of a higher repetition (cycle) rate for these sources, and to possibly tailor HPM waveforms to optimize their effects. To do this, the community would have to focus on developing broadband HPM amplifiers to generate a desirable waveform at low power, and then amplify that signal to a much higher power. In addition, to make HPM viable from a practical application standpoint, advances in compact pulsed power were necessary so these newer models could leave the laboratory and fit on mobile platforms.

Which brings us to why the Department of Defense and the Air Force would be interested in directed energy microwaves in the first place. Several very good reasons: speed of light, all-weather electronic attack of enemy systems; area coverage of multiple targets; surgical strike; minimal collateral damage: simplified pointing and tracking; and extended operational time with low operating costs.

These significant advantages led AFOSR to fund what can be described as a paradigm shift in the HPM community at the University of New Mexico in 1994. It was at this time that virtual prototyping – the use of sophisticated particle-in-cell codes – was recognized as a critical tool for HPM source researchers. PIC codes revolutionized the field. Developed by plasma physicists, these three dimensional finite-difference-time-domain fully electromagnetic field solvers incorporate relativistic dynamics. The result: virtual prototyping, which led to a concentration on effects-driven HPM source research, the pursuit of which is greatly enhanced by the innovative use of metamaterials in confining, controlling and radiating intense microwave pulses.

In his concluding remarks, Schamiloglu noted that AFOSR investment has been key to supporting the transition to virtual prototyping that has resulted in more efficient and cost effective HPM source design and that this investment has led the way to more compact sources of pulsed power to drive HPM sources, and that continued AFOSR investment is paving the way to effects-driven HPM source research, which will lead to novel amplifiers.

AFOSR continues to expand the horizon of scientific knowledge through its leadership and management of the Air Force’s basic research program. As a vital component of the Air Force Research Laboratory, AFOSR’s mission is to discover, shape and champion basic science that profoundly impacts the future Air Force.

 




All of this week's top headlines to your email every Friday.


 
 

 
NASA photograph by Joel Kowsky

NASA’s 2015 sample return robot challenge open for registration

NASA photograph by Joel Kowsky A team robot approaches the sample during the 2014 NASA Centennial Challenges Sample Return Robot Challenge at the Worcester Polytechnic Institute (WPI) in Worcester, Mass. Teams are required to d...
 
 

Palmdale Aerospace Academy prepares bots for battle

The award-winning Gryffingear Robotics Team of The Palmdale Aerospace Academy will be battling for a winning title in competition later this month. Representing Palmdale at the Southern California Regional Robotics Forum’s annual off-season FIRSTÆ Robotics Competition, The Academy’s “Basilisk” and “Golden Snitch” will each be competing both days among 34 oth...
 
 

Wings, Wheels and Rotors

The Annual Wings, Wheels and Rotors open house at the Los Alamitos Army Airfield in California is slated to run 9 a.m.-4 p.m., Oct. 26. The open house is hosted by the California National Guard, Joint Forces Training Base and the Los Alamitos Area Chamber of Commerce. All activities will take place on† the flightline...
 

 

Inside 3D Printing returns to California

Inside 3D Printing is returning to California Oct. 21-23 for their largest event yet. The conference will feature 57 informational sessions, four keynotes, a full day of workshops and more than 60 speakers across 13 vertical tracks – including a track dedicated solely to 3D printing in the aerospace industry. Confirmed sessions for the Aerospace...
 
 

World War I flying event to feature interactive educational activities

The 2014 World War I Dawn Patrol Rendezvous will not only allow visitors to see great flying action from the early years of aviation, but also includes free interactive educational programs that provide a hands-on experience for the entire family, Sept. 27-28 at the National Museum of the U.S. Air Force in Dayton, Ohio. Presented...
 
 
Air Force photograph by Ken LaRock

Air Force Museum to begin restoring massive Titan 4B rocket

Air Force photograph by Ken LaRock Visitors are able to see the Titan 4B during the Behind the Scenes Tours of the National Museum of the U.S. Air Force restoration hangars. The impressive Titan 4B, with roots going back to the...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>