[Fusion] Basic concept behind the Stellarator

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SUMMARY

The discussion centers on the principle of Stellarators in plasma physics, specifically addressing how Magnetohydrodynamic (MHD) equilibrium is achieved without plasma current. Participants clarify that MHD equilibrium is maintained through the unique geometry of the Stellarator's magnetic field, which is designed as a twisted and warped ring. This contrasts with tokamaks, which require additional toroidal, poloidal, and vertical balancing fields to prevent plasma expansion and wall contact.

PREREQUISITES
  • Understanding of Magnetohydrodynamics (MHD)
  • Familiarity with plasma physics concepts
  • Knowledge of Stellarator and Tokamak designs
  • Basic principles of magnetic confinement in fusion reactors
NEXT STEPS
  • Research the geometry and magnetic field configurations of Stellarators
  • Study the principles of MHD equilibrium in plasma confinement
  • Explore the differences between Stellarators and Tokamaks in fusion technology
  • Learn about plasma stability and the role of magnetic fields in fusion reactors
USEFUL FOR

Students and researchers in plasma physics, fusion energy enthusiasts, and professionals involved in the design and operation of fusion reactors will benefit from this discussion.

Meaning
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Hey

I am starting a course on plasma physics, I don't understand the principle of Stellarators.

If there is no plasma current, how is the mhd equilibrium achieved (J \times B = grad P)?

I apologize if the answer is obvious, but I starting with this
 
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@Meaning Well the answer is by no means obvious.

Well as far as I know they achieve the MHD equilibrium with the geometry of the field. That is why the stellarator looks like a weird twisted and warped ring. This is the reason why you need toroidal and poloidal(plasma induced current) and vertical balancing fields in a symmetrical torus like a tokamak, otherwise the plasma tends to expands outward , form islands of charge and eventually hit the walls.
 

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