Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

RAMBO a small but powerful magnet

07.01.2014
Rice University system allows high-magnetic-field experiments on a tabletop

Rice University scientists have pioneered a tabletop magnetic pulse generator that does the work of a room-sized machine – and more.

The device dubbed “RAMBO” – short for Rice Advanced Magnet with Broadband Optics – will allow researchers who visit the university to run spectroscopy-based experiments on materials in pulsed magnetic fields of up to 30 tesla. (A high-resolution magnetic resonance imaging system is about 10 tesla in strength.)

The Rice lab of physicist Junichiro Kono created RAMBO in collaboration with Hiroyuki Nojiri at the Institute for Materials Research at Tohoku University in Sendai, Japan. Details appeared online recently in the American Institute of Physics journal Review of Scientific Instruments.

The advantages of such a small machine are many, said Timothy Noe, a postdoctoral research associate in Kono’s group and lead author of the paper. Aside from its size and powerful performance, RAMBO has windows that allow researchers to directly send a laser beam to the sample and collect data at close range.

“We can literally see the sample inside the magnet,” Kono said. “We have direct optical access, whereas if you go to a national high magnetic field facility, you have a monster magnet, and you can only access the sample through a very long optical fiber. You cannot do any nonlinear or ultrafast optical spectroscopy.

“RAMBO finally gives us the ability to combine ultrastrong magnetic fields and very short and intense optical pulses. It’s a combination of two extreme conditions.”

The device’s unique configuration allows for the best access ever in a powerful magnetic field generator meant for scientific experimentation. Researchers can collect real-time, high-resolution data in a system that couples high magnetic fields and low temperatures with direct optical access to the magnet’s core, Kono said.

In addition, the unit can run a new experiment in a 30-tesla field every 10 minutes (or less for smaller peak fields), as opposed to waiting the hours often required for field generators to cool down after each experiment at large laboratories.

The device has already paid dividends for Kono’s group, which studies superfluorescence by hitting materials with femtosecond laser pulses to trigger quantum effects. RAMBO allows the laser pulse, the magnetic field pulse and the spectrometer to work in sync.

RAMBO is possible, he said, because of Nojiri’s development of a small and light mini-coil magnet. A little bigger than a spool of thread, the magnet allows Rice researchers to perform on campus many of the experiments they once carried out at the National High Magnetic Field Laboratory at Florida State University or at Los Alamos National Laboratory.

The Florida State facility has produced continuous magnetic fields of 45 tesla; Los Alamos has produced pulses over 100 tesla.

“I would say we’ve been able to do 80 percent of the experiments here that we used to have to do elsewhere,” Kono said. “And that’s not all. There are things that only we can do here. This is a unique system that doesn’t exist anywhere else in the world.

“High magnetic fields have been around for many years. Ultrafast spectroscopy has been around for many years. But this is the first combination of the two,” he said.

Kono’s group built the system to analyze very small, if not microscopic, samples. A sample plate sits on a long sapphire cylinder that passes through the coil’s container and juts through one end of the magnet to place it directly in the center of the magnetic field.

The cylinder provides one direct window to the experiment; a port on the other side of the container looks directly down upon the sample. The coil is bathed in liquid nitrogen to keep it cool at around 80 kelvins (-315 degrees Fahrenheit). The sample temperature can be independently controlled from about 10 K to room temperature by adjusting the flow of liquid helium to the sapphire cylinder.

Kono said he expects RAMBO to make Rice one center of an international network of researchers working on modern materials. “This opens up all kinds of possibilities,” he said. “Scientists working in different areas will come up with new ideas just by knowing such a thing is possible.”

He said the team has already collaborated with Jean Léotin, a co-author of the paper and a professor at the Laboratoire National des Champs Magnétiques Intenses in Toulouse, France, to perform one of the first time-domain terahertz spectroscopy experiments in high magnetic fields.

Co-authors include Joseph Lee, a student at Clements High School, Sugar Land, Texas, who works in Kono’s lab, and Gary Woods, a professor in the practice of computer technology and electrical and computer engineering.

The National Science Foundation, the Department of Energy and the Robert A. Welch Foundation supported the research.

Jeff Falk | EurekAlert!
Further information:
http://www.rice.edu
http://news.rice.edu/2014/01/06/rambo-a-small-but-powerful-magnet-2/

More articles from Physics and Astronomy:

nachricht New record in materials research: 1 terapascals in a laboratory
22.07.2016 | Universität Bayreuth

nachricht Mapping electromagnetic waveforms
22.07.2016 | Max-Planck-Institut für Quantenoptik

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: Mapping electromagnetic waveforms

Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.

Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...

Im Focus: Continental tug-of-war - until the rope snaps

Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases

Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...

Im Focus: A Peek into the “Birthing Room” of Ribosomes

Scaffolding and specialised workers help with the delivery – Heidelberg biochemists gain new insights into biogenesis

A type of scaffolding on which specialised workers ply their trade helps in the manufacturing process of the two subunits from which the ribosome – the protein...

Im Focus: New protocol enables analysis of metabolic products from fixed tissues

Scientists at the Helmholtz Zentrum München have developed a new mass spectrometry imaging method which, for the first time, makes it possible to analyze hundreds of metabolites in fixed tissue samples. Their findings, published in the journal Nature Protocols, explain the new access to metabolic information, which will offer previously unexploited potential for tissue-based research and molecular diagnostics.

In biomedical research, working with tissue samples is indispensable because it permits insights into the biological reality of patients, for example, in...

Im Focus: Computer Simulation Renders Transient Chemical Structures Visible

Chemists at the University of Basel have succeeded in using computer simulations to elucidate transient structures in proteins. In the journal Angewandte Chemie, the researchers set out how computer simulations of details at the atomic level can be used to understand proteins’ modes of action.

Using computational chemistry, it is possible to characterize the motion of individual atoms of a molecule. Today, the latest simulation techniques allow...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

GROWING IN CITIES - Interdisciplinary Perspectives on Urban Gardening

15.07.2016 | Event News

SIGGRAPH2016 Computer Graphics Interactive Techniques, 24-28 July, Anaheim, California

15.07.2016 | Event News

Partner countries of FAIR accelerator meet in Darmstadt and approve developments

11.07.2016 | Event News

 
Latest News

Hey robot, shimmy like a centipede

22.07.2016 | Information Technology

New record in materials research: 1 terapascals in a laboratory

22.07.2016 | Physics and Astronomy

University of Graz researchers challenge 140-year-old paradigm of lichen symbiosis

22.07.2016 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>