 |
|
A novel X-ray source could be brightest in the world
June 23, 2008The 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.
DOE/Argonne National Laboratory
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.
DOE/Argonne National Laboratory
X-ray Current Events and X-ray News RSSResearcher: 'Optical biopsy' for breast cancer increasingly accurate
But women may not have to endure the medical costs, stress and potential complications that accompany such invasive biopsies forever. A University of Florida biomedical engineering researcher is making progress on an "optical biopsy" that has the potential to determine whether growths are cancerous without ever puncturing the skin.
Carbon atmosphere discovered on neutron star
Evidence for a thin veil of carbon has been found on the neutron star in the Cassiopeia A supernova remnant. This discovery, made with NASA's Chandra X-ray Observatory, resolves a ten-year mystery surrounding this object.
Heavy metals accumulate more in some mushrooms than in others
A research team from the University of Castilla-La Mancha (UCLM) has analysed the presence of heavy metals in 12 species of mushroom collected from non-contaminated natural areas, and has found that the levels vary depending on the type of mushroom.
This is your brain on fatty acids
Saturated fats have a deservedly bad reputation, but Johns Hopkins scientists have discovered that a sticky lipid occurring naturally at high levels in the brain may help us memorize grandma's recipe for cinnamon buns, as well as recall how, decades ago, she served them up steaming from the oven.
A special issue on the International Workshop of the 2008 Solar Total Eclipse
On August 1, 2008 a total solar eclipse was visible within a narrow corridor that traversed from North America to China.
Blast from the past gives clues about early universe
Astronomers using the National Science Foundation's Very Large Array (VLA) radio telescope have gained tantalizing insights into the nature of the most distant object ever observed in the Universe -- a gigantic stellar explosion known as a Gamma Ray Burst (GRB).
Stanford study recommends change in treating pulmonary embolisms
William Kuo, MD, was the on-call interventional radiologist one Friday night three years ago when he received a call from the intensive care unit at Stanford Hospital & Clinics.
Trembling hands and molecular handshakes
Fragile X tremor/ataxia syndrome (FXTAS) is a recently recognized condition, which is actually one of the most prevalent heritable neurodegenerative diseases.
Mantis shrimps could show us the way to a better DVD
The remarkable eyes of a marine crustacean could inspire the next generation of DVD and CD players, according to a new study from the University of Bristol published today in Nature Photonics.
Galaxy cluster smashes distance record
The most distant galaxy cluster yet has been discovered by combining data from NASA's Chandra X-ray Observatory and optical and infrared telescopes.
More X-ray Current Events and X-ray News Articles
|
Paul Frank The Ray Ban Julius Tee in Black,T-shirts for Women, Extra Small,Black by Paul Frank Paul Frank The Ray Ban Julius Tee in Black,T-shirts for Women: Model is wearing a size Small Crew neck tee with screen print on front; 100% cotton. By Paul Frank | |
 |
X-Ray: See Through the World Around You by Nick Veasey (Author) A beautiful and utterly mesmerizing view of everyday objects. Using security scanners and x-ray machines, Nick Veasey creates beautiful, unsettling, inside-out images that reveal—like never before—the intricacy of everyday objects, animals, and plants. Whether the spectacle of an x-rayed Boeing 777, the elaborate geometry of an mp3 player’s circuit boards, or the ethereal grace of a translucent daffodil, each page of this book is an absorbing work of art. In a security-obsessed age, Veasey’s work is subtly subversive, as it uses sophisticated technology to discover inner beauty rather than concealed dangers. Veasey captures the x-ray images on film in a lead-lined studio. (He works on the outside of the studio when the machines are operating.) Once the... |
 |
Izod Women's Long Sleeve Exploding V-Nk Argyle,Coral Ray,X-Large by IZOD |
 |
X-Ray Goggles Sunglasses by Elope Glasses are the perfect accessory to any costume or great for everyday wear. |
 |
X-Ray: The Unauthorized Autobiography by Ray Davies (Author) This subversively brilliant rock memoir, ingeniously styled as a biography, is the work of a nameless, faceless writer hired by an Orwellian entity called "the Corporation" to capture the essence of Ray Davies, lead singer and songwriter of The Kinks and one of the greatest rock 'n' rollers of all time. Tales of London and the swinging Sixties rock scene evolve as R.D. reveals his life and times to the writer, often passing his stories directly into the writer's consciousness. Carnaby Street, "Top of the Pops," the Cavern Club, The Beatles, The Rolling Stones, The Who, and other fixtures of the period fade in and out of this compelling narrative. Part memoir, part social history, part psychological thriller, this elusive and daring book exposes rock stardom as the... |
|
Paul Frank The Ray Ban Band Tee in Army Green,T-shirts for Women, Extra Small,Army Green by Paul Frank Paul Frank The Ray Ban Band Tee in Army Green,T-shirts for Women: Model is wearing a size Small Crew neck tee with screen print on front; 100% cotton. By Paul Frank | |
 |
Pioneer BDR-205 12X Blu-ray Burner Black/Bulk Package w/Software (World's Fastest Blu-ray Writer) by Pioneer The BDR-205 Blu-ray Disc/DVD/CD Writer is the next generation Blu-ray Disc Writer from Pioneer. This writer allows users to test & author high-definition Blu-ray Disc content while also delivering the ability for high-capacity data storage. The drive can read BD-ROM discs, read/write dual layer BD-R & BD-RE discs, read DVD-ROM, and read/write most DVD and CD recordable media formats. |
 |
Understanding X-Rays: A Plain English Approach by Mikel A. Rothenberg (Author), MD (Author) X-rays are valuable diagnostic tools that help you visualize patient progress, document outcomes of nursing interventions, target care to specific problems, and communicate more effectively with other healthcare professionals. This reference set will help you learn to distinguish improper tube and line placement; common respiratory conditions; abdominal and respiratory foreign bodies; ARDS; abnormal air and fluid collections; chest, neck, abdominal and head trauma; abnormal bowel patterns; strains, sprains, dislocations and fractures. |
 |
Kid Galaxy Mega X Morphibian devil ray by Kid Galaxy The Mega X Moprhibian is one super high-powered amphibious R/C! This car is designed to go as fast as it looks -- and it is one aggressive, mean machine. Fully functional with deep-tread tires that dig up dirt while riding across the terrain, you can "morph" it onto the lake, pond or stream and watch water spit up from the tires while twin propellers spin for extra power. Requires one 9V battery, not included. Measures 15.9"L x 13.6"W x 7"H. |
 |
Jessica's X-Ray by Pat Zonta (Author), Clive Dobson (Illustrator) Featuring six real x-rays printed on mylar, Jessica's X-Ray is a unique and fun look inside our bodies and the world of x-rays written by a professional x-ray technologist who has worked extensively with children. In the book, kids follow Jessica, who has broken her arm, as she tours the hospital seeing x-ray rooms and looking at actual x-ray, CAT-scan, MRI and ultrasound images. These real x-ray images are printed on mylar so readers can see firsthand what Jessica sees. An identification key at the end of the book also helps kids pick out bones and muscles on their own. |
| © 2009 BrightSurf.com |