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Laser beam combiner for Thomson scattering core LIDAR.

I Balboa1, B Huang, G Naylor

  • 1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom. itziar.balboa@ccfe.ac.uk

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Summary

This study introduces a scanning mirror to combine multiple lasers for Thomson scattering diagnostics, enhancing tokamak repetition rates. This innovation improves laser pointing stability for fusion energy research.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Optical diagnostics

Background:

  • Thomson scattering (TS) is a crucial diagnostic for plasma measurement in tokamaks.
  • Current TS systems using single, high-energy, short-pulse lasers have limited repetition rates.
  • Increasing the repetition rate is essential for advanced fusion research and future reactors.

Purpose of the Study:

  • To develop a novel laser beam combining system to increase the repetition rate of TS diagnostics.
  • To assess the pointing stability and long-term reliability of the proposed system.
  • To evaluate the system's potential application in major fusion devices like ITER and JET.

Main Methods:

  • A scanning mirror was designed and implemented as a laser beam combiner.
  • Position accuracy and jitter measurements were performed to quantify beam pointing stability.
  • A control feedback loop was integrated to ensure long-term stability.

Main Results:

  • The scanning mirror system demonstrated excellent laser beam pointing stability within ±25 μrad over tens of seconds.
  • The implemented control feedback loop confirmed long-term operational stability.
  • The system's design is compatible with the requirements of large-scale fusion experiments.

Conclusions:

  • The developed scanning mirror system effectively increases the repetition rate of Thomson scattering diagnostics.
  • The system offers high pointing stability and long-term reliability, crucial for fusion plasma research.
  • This technology presents a viable solution for advanced diagnostics in ITER and JET.