MilliKelvin Lab at NHMFL

							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?