Download - Barnett effect
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WORKING TOWARDS THE DETECTION OF THE NUCLEAR BARNETT EFFECTBRYANT E. AVILA
CARLOS MERILES’ LAB
2015
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BACKGROUND
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ANGULAR MOMENTUM AND SPIN
MASS MASSR
MASSP= *VELOCITY
L=RxP
J: Spin
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The same year Einstein and de Haas showed the counter effect.
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Homonuclear Dipole – Dipole Hamiltonian: Expresses the interaction of two likespins with fixed physical coordinates.
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HOW DOES PHYSICAL ROTATION INDUCE MAGNETIZATION?
Expressed in spherical coordinates.
Ehrenfest Theorem
It can be shown that…
WhereBut we are talking about a macroscopic system…
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THE EQUIVALENCE
IT PRODUCES THE SAME RESULT!
Rotation Effect Magnetization Effect
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CHANGING TO A ROTATING FRAME
It is clear that magnetization would be produce Due to the appearance of a so called ghost magnetic field
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QUESTION?Can the Barnett Effect be expressed and detected at the nuclear regime?
WHY?As a first it has never been proven. If proved it can open the door to pumping spin magnetization through mechanical rotation instead of using NMR magnetic fields which are very expensive to maintain. Possibly special rotation + vibrations sequences can be created to obtain desired results.
GUESS…I do believe this effect should be pronounced, but we need an experiment to test the theory as always.
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PROBLEM!!!There is no machinery out in the market that would allow us to conduct this experiment right away.
Built a machine capable of functioning in many stages in order to prove this effect.
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WHAT SHOULD THIS MACHINE BE CAPABLE OF?
SpinningBullet containing
sample.
ShuttlingBullet.
NMRSignal
MAIN STAGES
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SpinningBullet containing
sample.
COMPONENTS OF SPINNING STAGE.
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CONTROLLERS & SHUTTLING STAGE.
Spinning & Shutting Coils(Magnetic fields)
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COMPONENTS OF ANALYSIS STAGE
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SOFTWARE AND TRANSLATION.
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SOFTWARE AND TRANSLATION.
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FUTURE WORK
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ACKNOWLEDGEMENTS
Dr. Carlos Meriles
And everybody in his lab!!
Linden Langhorne (Machine Shop)
NIH grant 5T34GM007639-34
Henry Wong
Dr. Nair, Tiburzi.
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THANK YOU! ANY QUESTIONS?