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Polarimeter for the General Fusion SPECTOR machine.

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A new polarimeter measures Faraday rotation to understand the safety factor (q) profile in the SPECTOR fusion machine. This tool aids in analyzing plasma behavior for fusion energy research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Optical diagnostics

Background:

  • Magnetized target fusion (MTF) research aims to achieve controlled nuclear fusion.
  • Understanding plasma properties, such as the safety factor (q), is crucial for MTF stability and performance.
  • The SPECTOR machine is a recently developed platform for MTF experiments.

Purpose of the Study:

  • To design and implement a polarimeter for measuring Faraday rotation in the SPECTOR fusion machine.
  • To utilize the polarimeter data to determine the safety factor (q) profile within the plasma.
  • To investigate the impact of measurement uncertainties and chord geometry on the accuracy of the q profile determination.

Main Methods:

  • Development of a specialized polarimeter instrument.
  • Employment of two counter-rotating, circularly polarized 118.8 μm laser beams for plasma probing.
  • Utilizing Grad-Shafranov simulations to model plasma behavior and assess measurement effects.

Main Results:

  • Successful design and implementation of a polarimeter for the SPECTOR machine.
  • Demonstrated capability to measure Faraday rotation, a key parameter for inferring plasma properties.
  • Simulation results provide insights into the sensitivity of the q profile measurement to experimental conditions.

Conclusions:

  • The developed polarimeter is a valuable diagnostic tool for the SPECTOR fusion machine.
  • Faraday rotation measurements, combined with simulations, can effectively characterize the safety factor profile.
  • This work contributes to the understanding and optimization of magnetized target fusion plasmas.