Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Argonne's CARIBU charge breeder breaks world record for efficiency

14.04.2010
Scientists at the U.S. Department of Energy’s (DOE) Argonne National Laboratory have pushed the limits of charge breeding and broken a long-standing world record for ionization efficiency of solids.

Argonne's Californium Rare Isotope Breeder Upgrade (CARIBU) project has reached 11.9 percent efficiency with metallic particles of rubidium. The previous metal record was 6.5 percent, using potassium, achieved at Laboratory of Subatomic Physics and Cosmology (LPSC) in Grenoble.

“There have been several improvements made that increased efficiency little by little until we finally reached record numbers, and we foresee even higher efficiencies in the future,” said senior accelerator physicist Richard Pardo.

CARIBU is an Accelerator Improvement Project funded by the U.S. Department of Energy’s Office of Science. Beams of stable isotopes from elements across the entire periodic table have been used at the Argonne Tandem-Linac Accelerator System (ATLAS) for research in nuclear physics for many years.

But when additional protons or neutrons are added to originally stable isotopes, the nuclei eventually become 'particle unstable', emitting excess protons or neutrons. Neutrons, unlike protons and electrons, have no charge; therefore, many more can be added to a nucleus before it becomes unstable.

The CARIBU project will extend ATLAS's reach to include potentially hundreds of previously unstudied isotopes.

CARIBU will use californium-252 to create neutron-rich heavy fission fragments at a rate of more than one billion per second. These fragments are thermalized in helium gas and converted into a low-energy beam of singly charged ions.

The charge breeder, an electron cyclotron resonance (ECR) ion source, takes these beams, stops them in the plasma and strips them to higher-charged states for reacceleration in ATLAS.

Scientists used two radio frequencies (RF) to excite the plasma in the ECR source. This resulted in the creation of higher charge states and improved efficiency. They also injected the RF radially into the source using an open—versus a closed—hexapole structure. This allowed for higher magnetic confinement of the hot plasma, as well as more uniform field gradients.

“Fundamentally, there are limits to how high an efficiency you can get in a charge breeder, but we can expect a 20-30 percent improvement of current numbers,” said Argonne principal engineer Richard Vondrasek.

So far, CARIBU has only used stable metal ions for charge breeding, but testing has just begun using the radioactive isotopes from the californium source.

CARIBU is an Accelerator Improvement Project funded by the U.S. Department of Energy’s Office of Science.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America 's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy's Office of Science.

For more information, please contact Brock Cooper (630/252-5565 or media@anl.gov) at Argonne.

Brock Cooper | EurekAlert!
Further information:
http://www.anl.gov
http://www.anl.gov/Media_Center/News/2010/news100412.html

More articles from Physics and Astronomy:

nachricht Water without windows: Capturing water vapor inside an electron microscope
13.12.2017 | Okinawa Institute of Science and Technology (OIST) Graduate University

nachricht Columbia engineers create artificial graphene in a nanofabricated semiconductor structure
13.12.2017 | Columbia University School of Engineering and Applied Science

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

A whole-body approach to understanding chemosensory cells

13.12.2017 | Health and Medicine

Water without windows: Capturing water vapor inside an electron microscope

13.12.2017 | Physics and Astronomy

Cellular Self-Digestion Process Triggers Autoimmune Disease

13.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>