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Abstract <p>Accurate measurement of the spatial electron density distribution requires control of the relative alignment between the laser beam and collection optics in the Thomson scattering diagnostic. The most reliable way to monitor alignment is by detecting signals from two observation regions positioned above and below the laser beam axis. This is achieved with specially designed split-fiber bundles divided into two viewing areas. Detecting Thomson scattering light from both halves of the bundle with a filter polychromator enables online alignment monitoring and adjusting the system during the plasma experiment, simultaneously with plasma parameter measurements. Such an alignment system has been implemented in the Thomson scattering diagnostic on the Globus-M2 tokamak.</p>

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Alignment of the Thomson Scattering Diagnostic on Globus-M2 Tokamak

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • E. E. Tkachenko,
  • G. S. Kurskiev,
  • N. S. Zhiltsov,
  • P. V. Chernakov,
  • S. Yu. Tolstyakov,
  • N. V. Sakharov,
  • Yu. V. Petrov,
  • V. B. Minaev,
  • E. O. Kiselev,
  • E. E. Mukhin,
  • A. N. Novokhatsky,
  • A. V. Nikolaev,
  • V. A. Solovey,
  • A. Yu. Telnova,
  • P. B. Shchegolev

摘要

Abstract

Accurate measurement of the spatial electron density distribution requires control of the relative alignment between the laser beam and collection optics in the Thomson scattering diagnostic. The most reliable way to monitor alignment is by detecting signals from two observation regions positioned above and below the laser beam axis. This is achieved with specially designed split-fiber bundles divided into two viewing areas. Detecting Thomson scattering light from both halves of the bundle with a filter polychromator enables online alignment monitoring and adjusting the system during the plasma experiment, simultaneously with plasma parameter measurements. Such an alignment system has been implemented in the Thomson scattering diagnostic on the Globus-M2 tokamak.