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Polychromator for the edge Thomson scattering system in ITER.

E Yatsuka¹, T Hatae, D Fujie

¹Japan Atomic Energy Agency, Naka, Ibaraki, Japan. yatsuka.eiichi@jaea.go.jp

The Review of Scientific Instruments

|November 7, 2012

Summary

A novel polychromator design for ITER

Area of Science:

Plasma physics
Optical engineering
Fusion energy research

Background:

The edge Thomson scattering system in ITER requires advanced optical components.
Conventional polychromators face limitations in spectral transmissivity and alignment accuracy.

Purpose of the Study:

To introduce a new polychromator design for ITER's edge Thomson scattering system.
To improve spectral channel performance and calibration capabilities.

Main Methods:

Parallel dispersion of signal light using an interference filter.
Design considerations for machine accuracy and alignment within the APD area.
Incorporation of dual-laser injection method for spectral transmissivity calibration.

Main Results:

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The new polychromator design potentially enhances spectral transmissivity compared to conventional types.
Misalignment issues are expected to be within acceptable margins.
Spectral channels can be configured for optimal calibration using the geometric mean of dual-laser wavelengths.

Conclusions:

The designed polychromator offers improved performance for ITER's edge Thomson scattering.
This design facilitates accurate spectral calibration crucial for plasma diagnostics.