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X-Point Effect on Plasma Blob Dynamics.

F Avino1, A Fasoli1, I Furno1

  • 1Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.

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|March 26, 2016
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Summary
This summary is machine-generated.

Plasma blobs accelerate towards magnetic field nulls (X points) and break apart. A new model explains this behavior using charge conservation and magnetic field effects, matching experimental data.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Magnetohydrodynamics

Background:

  • Plasma blobs are structures that can impact plasma confinement in fusion devices.
  • Understanding blob dynamics near magnetic field nulls is crucial for controlling plasma behavior.

Purpose of the Study:

  • To investigate plasma blob dynamics near a magnetic field null (X point) in the TORPEX device.
  • To develop and validate an analytical model for blob motion and fragmentation.

Main Methods:

  • Experimental measurements of E×B drifts and blob potential in TORPEX.
  • Development of an analytical model incorporating charge conservation, ion polarization, diamagnetic, and parallel currents.
  • Comparison of model predictions with experimental data.

Main Results:

  • Observed significant acceleration of plasma blobs towards the X point.
  • Documented blob fragmentation near the X point.
  • Model showed good quantitative agreement with experimental data for the initial acceleration phase.

Conclusions:

  • The decrease in poloidal magnetic field intensity near the X point plays a critical role in blob motion.
  • The analytical model successfully explains the observed blob dynamics, particularly the acceleration and fragmentation.
  • Findings contribute to a better understanding of plasma transport in fusion devices.