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Development of a tracer-containing compact-toroid injection system.

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|November 8, 2018
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A new tracer-containing compact-toroid (TCCT) injection system overcomes limitations of previous methods for studying impurities in fusion reactors. This advanced system enables better impurity control and plasma confinement in magnetically confined fusion devices.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics
  • Materials Science

Background:

  • Impurity accumulation in magnetically confined fusion reactors can degrade plasma performance.
  • Current impurity injection methods, like tracer-encapsulated solid pellets (TESPELs), have limitations in penetration depth and impurity quantity.

Purpose of the Study:

  • To develop an improved system for injecting tracer impurities into fusion plasmas.
  • To address the shortcomings of existing TESPEL techniques for impurity studies.

Main Methods:

  • Development of a tracer-containing compact-toroid (TCCT) injection system.
  • Utilizing a magnetized coaxial plasma gun (MCPG) for plasmoid acceleration.
  • Sputtering and ionization of electrode material by discharge current within the MCPG.

Main Results:

  • The MCPG accelerates magnetized plasmoids to speeds exceeding ion thermal velocity (tens of km/s).
  • The TCCT system successfully ejects a warm, ionized plasma containing tracer ions.
  • The TCCT approach offers potential for deeper core plasma penetration with reduced adverse effects.

Conclusions:

  • The developed TCCT injection system offers a promising advancement for fusion plasma impurity research.
  • This new method could lead to better understanding and control of impurities in future fusion reactors.
  • The TCCT system provides a more effective means to study impurity behavior and its impact on plasma confinement.