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Related Concept Videos

Magnetic Fields01:27

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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Magnetic field stabilization system for atomic physics experiments.

B Merkel1, K Thirumalai1, J E Tarlton1

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.

The Review of Scientific Instruments
|May 3, 2019
PubMed
Summary
This summary is machine-generated.

We stabilized a 14.6 millitesla (mT) magnetic field to 4.3 nanotesla (nT) noise using a feedback system. This high stability is crucial for atomic physics experiments requiring precise magnetic field control.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Information Science
  • Metrology

Background:

  • Atomic physics experiments utilize millitesla-scale magnetic fields for quantization.
  • Precise magnetic field stability is essential as atomic transition frequencies are field-dependent.
  • Commercial power supplies often lack the required stability for electromagnets used in these experiments.

Purpose of the Study:

  • To demonstrate a method for stabilizing a millitesla-scale magnetic field.
  • To achieve high-precision magnetic field stabilization for atomic physics applications.
  • To improve the performance of experiments reliant on stable magnetic fields.

Main Methods:

  • Implemented a feedback and feedforward control system to regulate current through magnetic field coils.
  • Utilized a single 43Ca+ ion in a Paul trap as a magnetometer.
  • Measured magnetic field noise using a field-dependent hyperfine transition of the 43Ca+ ion.

Main Results:

  • Stabilized a 14.6 millitesla (mT) magnetic field to 4.3 nanotesla (nT) root-mean-square (rms) noise (0.29 parts per million).
  • Reduced magnetic field noise from over 100 nT to 4.3 nT rms without stabilization.
  • Projected coherence time of many hours for a 43Ca+ atomic clock qubit transition at 14.6 mT.

Conclusions:

  • The developed system significantly enhances magnetic field stability for atomic physics.
  • The technique is adaptable to various field amplitudes and suitable for applications like neutral atom traps.
  • High magnetic field stability opens possibilities for longer coherence times and more precise measurements.