Amanda Underwood

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MilliKelvin Lab at NHMFL Tallahassee, Florida

• Amanda Underwood
• Robertson Elementary
• Robertson, Kentucky
• Soon Young Kim
• Moanalua High School
• Honolulu, Hawaii

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Mentors

• Dr. Eric Palm

• Mr. Tim Murphy

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MilliKelvin Lab

• Low temperature physics
• House three super-conducting Magnets
• User facility

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Purpose of MilliKelvin Lab

• To reduce thermal motion of molecules in the
  sample so the motion doesnt hide the effects
  being studied
• Behavior of new combinations of materials can be
  observed
• To study the phase transition

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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

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Cryogenic Material

• Cooling Liquid Temperature at atmospheric
  pressure
• Oxygen 80K
• Nitrogen 77K
• Hydrogen 20K
• Helium-4 4.2K
• Helium-3 3.2K

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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

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He-3 and He-4 Mixture

• Cooling with the mixture in the dilution
  refrigerator the lab can achieve 0.008K (8mK)

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Hybrid Magnet

• 34 T Resistant magnet
• 11 T Super-conducting magnet
• 45 Tesla

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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.

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Setting Up Portable dilution refrigerator in
Hybrid
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Setting Up Portable dilution refrigerator in
Hybrid

• Probe and vacuum pipe

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Setting Up Portable dilution refrigerator in
Hybrid
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Setting Up Portable dilution refrigerator in
Hybrid
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Problems

• Vibration
• Humidity
• Availability of specific probes
• Time
• Faulty instrumentation
• Magnet time
• Set up time
• User time
• Contamination

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Vibration

• Isolated Sand filled tripod
• Thomson rails

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Condensation

• Swab the magnet bore
• Flush with Nitrogen gas

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Probes

• Build and design probes in Millikelvin lab

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Time

• Faulty instrumentation
• Magnet time
• Set up time
• User time

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Contamination

• charcoal filter used to purify and recycle Helium

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Research Area

• CeCoIn5
• CeIrIn5
• Depleted Uranium (non-radioactive)
• Instrumentation
• Cantilever Magnetometry
• Tunnel Diode Oscillator
• used for sensitivity and size

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Research Area

• Tunnel Diode Oscillator

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Application

• Pure Science
• Curiosity
• spin-off
• Later use
• New materials/ Technology will follow
• Examples
• dilution refrigerator
• superconductor

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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

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Thank You! ?

• National High Magnetic Field Lab
• National Science Foundation

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Any Questions?