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RAMBO a small but powerful magnet
Date:1/6/2014

t 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 1
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Contact: Jeff Falk
jfalk@rice.edu
713-348-6775
Rice University
Source:Eurekalert  

Page: 1 2 3

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