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MilliKelvin Lab at NHMFL Tallahassee, Florida Amanda Underwood Robertson Elementary Robertson, Kentucky Soon Young Kim Moanalua High School Honolulu, Hawaii Mentors • Dr. Eric Palm • Mr. Tim Murphy MilliKelvin Lab • Low temperature physics • House three super-conducting Magnets • User facility Purpose of MilliKelvin Lab • To reduce thermal motion of molecules in the sample so the motion doesn’t hide the effects being studied • Behavior of new combinations of materials can be observed • To study the phase transition MilliKelvin Instrumentation • Two 20 Tesla magnets – Largest commercially available magnets – Top loader – Bottom loader • One 17 T Magnet • Dilution refrigerator – Enables temperature of 25K above absolute zero Cryogenic Material • Cooling Liquid Temperature at atmospheric pressure – Oxygen 80K – Nitrogen 77K – Hydrogen 20K – Helium-4 4.2K – Helium-3 3.2K 3He and 4He • He-3 is a bi-product of nuclear decay • He-3 and He-4 mixture are used to produce lower temperatures • decreasing pressure will decrease temperatures • At 1 millibar of pressure – He-4 is 1.2K – He-3 is 0.3K He-3 and He-4 Mixture • Cooling with the mixture in the dilution refrigerator the lab can achieve 0.008K (8mK) Hybrid Magnet • 34 T Resistant magnet • 11 T Super- conducting magnet • 45 Tesla Hybrid Magnet • Users – Other researching scientist apply to use the Hybrid magnet. The Magnet Lab divides the time among the different scientists. • Set up – There are two ways this can be done. Collaboration with in-house researchers or the lab provides the magnet and instruments for the researchers to use. Setting Up Portable dilution refrigerator in Hybrid Setting Up Portable dilution refrigerator in Hybrid • Probe and vacuum pipe Setting Up Portable dilution refrigerator in Hybrid Setting Up Portable dilution refrigerator in Hybrid Problems • Vibration • Humidity • Availability of specific probes • Time – Faulty instrumentation – Magnet time – Set up time – User time • Contamination Vibration • Isolated Sand filled tripod • Thomson rails Condensation • Swab the magnet bore • Flush with Nitrogen gas Probes • Build and design probes in Millikelvin lab Time • Faulty instrumentation • Magnet time • Set up time • User time Contamination • charcoal filter used to purify and recycle Helium Research Area • CeCoIn5 • CeIrIn5 • Depleted Uranium (non-radioactive) • Instrumentation – Cantilever Magnetometry – Tunnel Diode Oscillator • used for sensitivity and size Research Area • Tunnel Diode Oscillator Application • Pure Science – Curiosity – spin-off – Later use – New materials/ Technology will follow – Examples • dilution refrigerator • superconductor Thank You! • MilliKelvin Lab – Dr. Eric Palm – Mr. Tim Murphy – Mr. Henri Radovan – Ms. Sahara Hernandez (REU) • CIRL Staff – Dr. Pat Dixon – Ms. Gina LaFrazza – Mr. Carlos Villa – Mr. Dave Sheaffer – Ms. Stacy Vanderlaan Thank You! • National High Magnetic Field Lab • National Science Foundation Any Questions?
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