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Plasma Heating due to Cyclic Diffusion across a Separatrix.

F Anderegg1, M Affolter1, D H E Dubin1

  • 1Physics Department 0319, University of California San Diego, La Jolla, California 92093, USA.

Physical Review Letters
|October 2, 2019
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Summary
This summary is machine-generated.

Plasma heating occurs when magnesium ions in a Penning-Malmberg trap cross a potential barrier. Collisional diffusion drives this irreversible heating, which is significant in low-collisionality plasmas.

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Area of Science:

  • Plasma Physics
  • Atomic Physics
  • Astrophysics

Background:

  • Penning-Malmberg traps are crucial for studying fundamental plasma behavior.
  • Understanding particle dynamics near potential barriers is key to plasma confinement and heating mechanisms.

Purpose of the Study:

  • To investigate plasma heating mechanisms in a Penning-Malmberg trap.
  • To analyze the role of collisional diffusion across a separatrix in irreversible heating.
  • To characterize the particle velocity distribution function under forced oscillations.

Main Methods:

  • Utilized a Penning-Malmberg trap to confine a magnesium ion column.
  • Applied an axisymmetric "squeeze" potential to create a velocity separatrix.
  • Measured particle velocity distribution using coherent laser-induced fluorescence.

Main Results:

  • Observed significant plasma heating due to collisional diffusion across the separatrix.
  • Heating rate scales with the square root of oscillation rate and collision frequency.
  • Demonstrated that this heating mechanism can dominate in low-collisionality plasmas.
  • Measured an out-of-phase response between trapped and passing particles.

Conclusions:

  • Collisional diffusion across a potential barrier's separatrix is an effective plasma heating mechanism.
  • The observed heating is irreversible and scales with plasma parameters.
  • This finding has implications for understanding heating processes in various plasma environments.