Subscribe to our free daily newsletters
  Space Travel News  




Subscribe to our free daily newsletters



A Novel X-Ray Source Could Be Brightest In The World

A user of an X-FELO will see an x-ray brightness which is higher on the average about six to eight orders of magnitude brighter than any previously created and three to four orders of magnitude brighter than proposed SASE technology.
by Staff Writers
Argonne IL (SPX) Jun 30, 2008
The future of high-intensity x-ray science has never been brighter now that scientists at U.S. Department of Energy's Argonne National Laboratory have devised a new type of next generation light sources.

"The free electron laser oscillator (X-FELO) we are proposing can create x-rays up to one hundred million times brighter than currently operating machines," Argonne Distinguished fellow Kwang-Je Kim said.

Current technology uses undulators to create bright x-ray beams of spontaneous emission at the Advanced Photon Source (APS) at Argonne. Much of the research for x-ray free electron lasers has been concentrated on self-amplified spontaneous emission (SASE), which would amplify the spontaneous emission by a factor of a million or more in a single pass.

A user of SASE will see x-ray brightness which is higher on the average about ten thousand times brighter than the APS is delivering.

In an X-FELO, the electron pulse enters an undulator and generates an x-ray that is reflected back into the undulator entrance by crystals and connects with the next electron bunch and again travels back along the undulator. This pattern is repeated indefinitely with the x-ray intensity growing each time until equilibrium is reached.

X-FELO will open up breakthrough scientific opportunities in various research fields. For example, the inelastic x-ray scattering and nuclear resonant scattering experiments at the APS are severely limited by small x-ray flux in meV bandwidth.

An X-FELO will enhance the flux by six to eight orders of magnitudes, shortening the data collection times by the same factor. Time-resolved measurement of the Fermi surface is a powerful way to study complex materials such as high-temperature super conductors. The characteristics of X-FELO are ideally suited for bulk-sensitive, hard x-ray photo-emission spectroscopy for this purpose.

The brightness, or more precisely the spectral brightness, is proportional to the intensity of coherent photons per unit spectral bandwidth. It is a standard figure of merits for the strength and purity of an x-ray source.

The intensity of individual x-ray pulse from an X-FELO is lower by about three orders of magnitudes. However the X-FELO pulse has extremely narrow bandwidth, three to four orders of magnitude narrower than the SASE. Furthermore, the pulses come with a repetition rates higher by two to four orders of magnitudes higher than in SASE.

Therefore a user of an X-FELO will see an x-ray brightness which is higher on the average about six to eight orders of magnitude brighter than any previously created and three to four orders of magnitude brighter than proposed SASE technology.

"Collaborators from around the world are working to develop the high-quality electron beam necessary for the oscillator," Kim said.

Related Links
DOE/Argonne National Laboratory
Powering The World in the 21st Century at Energy-Daily.com



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


UBC Physicists Develop Impossible Technique To Study And Develop Superconductors
Vancouver, Canada (SPX) Jun 27, 2008
A team of University of British Columbia researchers has developed a technique that controls the number of electrons on the surface of high-temperature superconductors, a procedure considered impossible for the past two decades.







  • SpaceX Conducts Static Test Firing Of Next Falcon 1 Rocket
  • Pratt And Whitney Rocketdyne Contract Option For Solar Thermal Propulsion Rocket Engine
  • NASA, ATK Conduct First Launch Abort System Igniter Test For Orion
  • Orion's New Launch Abort Motor Test Stand Ready For Action

  • Successful Ariane 5 Solid Rocket Booster Test Firing
  • ProtoStar I And BADR-6 Are Ready For Next Ariane 5 Launch
  • CU-Boulder Students Set To Launch Student Rocket Payloads June 27
  • Kourou Spaceport Receives Fifth Ariane 5 For 2008

  • Disaster plan in place for Hubble mission
  • US space shuttle lands safely after installing Japanese lab
  • Space shuttle cleared to land, loose object poses no risk
  • Space shuttle blastoff damaged launch pad: NASA

  • Shuttle astronauts bid farewell to space station crew
  • Discovery undocks from ISS
  • Shuttle Astronauts Bid Farewell To Space Station Crew
  • Russia Eyeing New Launch Services Deal With US

  • NASA Awards Information Management And Communications Support Contract
  • Aldrin warns US risks falling behind in space race
  • Launch pad repairs priced at $2.7 million
  • Fly Your Thesis - An Astronaut Experience

  • A Better Focus On Shenzhou
  • Gallup Poll Shows Americans Unconcerned About China Space Program
  • Chinese company develops 'UFO': report
  • Two Suits For Shenzhou

  • Three Engineers, Hundreds of Robots, One Warehouse
  • Tartalo The Robot Is Knocking On Your Door
  • Sega, Hasbro unveil new dancing robot
  • Japanese Companies Unite To Bring Robots To The Home

  • Martian Soil Good Enough For Asparagus
  • Phoenix Returns Treasure Trove For Science
  • NASA's Phoenix Mars Lander Puts Soil In Chemistry Lab
  • Laser Fluorescence Could Find Life On Mars

  • The content herein, unless otherwise known to be public domain, are Copyright Space.TV Corporation. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal 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.TV Corp on any Web page published or hosted by Space.TV Corp. Privacy Statement