formal magnetometer presentation
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Vito IaiaPrinciple Investigator: Professor Robert DynesMentors: Dr. Shane Cybart, Travis Wong, and Ethan Cho
Novel Magnetometer Utilizing Superconducting Electronics
Why a Magnetometer device?
Can sense weak magnetic fields Threshold magnetic
field sensor ≈10-12 T▪ Earth’s Magnetic field
≈50μT Compact Portable AdvancedCommunication applications!
MEG
Source: http://csis.org/blog/history-space-radar-brief-survey-radar-capabilities
Boeing Hawk Eye2
High Transition Superconductivity
Flow of current without resistance!
No Voltage! Yttrium
Barium Copper Oxide (YBCO) Tc = 90K
Source: http://www.devillier.com/ab_zero/get_involved/resources/topic_measuring_col
d.htm
YBCO (90K)
MgB2 (39K)
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Liquid Helium (4K)
Nb3Sn (18.3K)
Liquid Nitrogen
(77K)
Kelvin Scale
Josephson Junctions (JJ) Barrier between two superconducting
materials - (SIS) or (SNS)
Source: S.A Cybart. Planar Josephson Junctions and Arrays. Dissertation, University of California, San Diego, 2005.
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Superconducting QUantum Interference Device (SQUID)
Two parallel Josephson Junctions Resistively Shunted Josephson (RSJ)
Magnetic flux through a SQUID is quantized Flux Quantum: φ0=h/2e Applied Magnetic field: φa
Source: J. Clarke, A.I. Braginski, The SQUID Handbook, Vol. 1, 2004.
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φa=(n+1/2) φ0
φa=nφ0φa
SQUID Pattern
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Measurement
Applied magnetic field causes SQUID pattern DC bias steepest slope for voltage
change
Applied Magnetic field
Time
7
Volta
ge
Magnetic Field
What is in the Magnetometer?
What will be in this Instrument? Cryocooler Several mountable circuit boards Magnet Power Source – 24V
Rack-mountable Box
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Cryocooler
Efficient and compact 40K cooler Reliable Efficient 100W
cooler Compact Powered by Car
Battery40K
Cooler
4K Cooler
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Circuitry
Pre-Amplifier
Low-Pass Filters
1 Hz OscillatorVoltage Regulators
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On-Board Magnet Magnet producing
a couple of mT Positioned in front
of YBCO chip Important for
device characterization
Magnet for YBCO
Chip
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Conclusion
Compact Efficient Portable
Source: http://www.supraconductivite.fr
Source: http://wall.alphacoders.com/big.php?i=309497Source:
NASA12
Magnetoencephalography (MEG)
Space Systems
http://www.mnn.com/earth-matters/space/stories/military-nasa-look-to-partner-with-commercial-satellite-industry
Special Thanks! Dr. Robert Dynes Dr. Shane Cybart Graduate students: Travis Wong and Ethan Cho Undergraduate students: Bjorn Wehlin and Meng Ma UC LEADS program STARS program
THANK YOU!
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References S.A. Cybart, S.M. Anton, S.M. Wu, et. al, Nano Lett., 9 (2009). J. Clarke, A.I. Braginski, The SQUID Handbook, Vol. 1, 2004. S. Cybart, E.Y. Cho, T.J. Wong, et. al, Appl.Phys. Lett., 104 (2012). S.A Cybart. Planar Josephson Junctions and Arrays. Dissertation, University of California, San Diego,
2005. Shane A. Cybart, E. Y. Cho, T. J. Wong, et. al, App. Phys. Lett., 104, 062601 (2014). http://www.supraconductivite.fr http://www.laboratorytalk.com http://physics.aalto.fi/groups/nanospin/facilities/pulsed-laser-deposition/ybco/ http://hep.physics.indiana.edu http://www.finestdaily.com http://www.magnet.fsu.edu http://csis.org/blog/history-space-radar-brief-survey-radar-capabilities http://www.redorbit.com/news/science/1112515558/magnetic-fields-can-send-particles-to-infinity/
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