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Potential Due to a Magnetized Object01:24

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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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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High-magnetic-confinement mode in partially magnetized E×B plasmas.

June Young Kim1, Jaeyoung Choi1, Y S Hwang1

  • 1Department of Nuclear Engineering, Seoul National University, Seoul, Korea.

Physical Review. E
|June 16, 2022
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Summary
This summary is machine-generated.

Researchers suppressed gradient-drift instability in E×B plasma using a biasable electrode. This led to high magnetic confinement, increasing core plasma density and preventing confinement saturation.

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Area of Science:

  • Plasma Physics
  • Fusion Energy Research
  • Applied Electromagnetics

Background:

  • Gradient-drift driven instability is a key factor limiting plasma confinement in E×B devices.
  • Achieving high-magnetic-confinement modes is crucial for efficient plasma control and fusion energy applications.
  • Nonambipolar plasma flow often leads to instabilities that degrade confinement.

Purpose of the Study:

  • To experimentally investigate the suppression of gradient-drift instability in a cylindrical partially magnetized E×B plasma.
  • To explore the transition to a high-magnetic-confinement mode using an edge biasable electrode.
  • To demonstrate a method for preventing magnetic confinement saturation.

Main Methods:

  • Utilizing a cylindrical partially magnetized E×B plasma device.
  • Implementing an additional biasable electrode at the radial edge.
  • Applying a positive voltage to the electrode to create an asymmetric electron-loss channel.
  • Measuring plasma density profiles and edge-to-center density ratios.

Main Results:

  • Successful suppression of the gradient-drift driven instability was achieved.
  • A transition to a high-magnetic-confinement mode was experimentally observed.
  • Applying voltage to the electrode created an asymmetric nonambipolar flow, breaking spatial symmetry.
  • Plasma density in the core increased up to four times compared to the unstable state.
  • A reduced edge-to-center density ratio of 0.16 indicated improved core confinement.

Conclusions:

  • Asymmetric nonambipolar flow, induced by an edge electrode, effectively suppresses gradient-drift instability.
  • This method enables the transition to a high-magnetic-confinement mode in E×B plasmas.
  • The findings demonstrate a viable strategy to prevent magnetic confinement saturation.