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Related Experiment Video

Updated: Jun 4, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Terrace retro-reflector array for poloidal polarimeter on ITER.

R Imazawa¹, Y Kawano, T Ono

¹Japan Atomic Energy Agency, Naka, Ibaraki, Japan. imazawa.ryota@jaea.go.jp

The Review of Scientific Instruments

|March 3, 2011

Summary

A novel terrace retro-reflector array (TERRA) offers efficient laser light reflection for ITER diagnostics. This compact design ensures bright fringes travel along the incident path, improving laser-aided measurements.

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Area of Science:

Plasma physics
Optical engineering
Fusion energy research

Background:

Conventional retro-reflectors struggle with high incident angles.
Space constraints are critical in fusion devices like ITER.
Accurate laser diagnostics are essential for plasma control.

Purpose of the Study:

To introduce and evaluate the terrace retro-reflector array (TERRA) for the ITER poloidal polarimeter.
To demonstrate TERRA's ability to reflect laser light efficiently at high incident angles.
To confirm TERRA's suitability for compact optical systems in fusion research.

Main Methods:

Development of a new diffraction formula for TERRA.
Modeling TERRA as a variable blaze angle Littrow grating.
Optical system design and light propagation simulation for ITER poloidal polarimeter.

Main Results:

TERRA reflects laser light effectively, even at high incident angles.
A new diffraction formula was developed and validated through simulation.
The designed optical system achieved 88.6% transmission efficiency.

Conclusions:

TERRA is a feasible and efficient retro-reflector for the ITER poloidal polarimeter.
The compact design and high reflectivity of TERRA meet ITER's diagnostic requirements.
TERRA represents a significant advancement in optical components for fusion energy research.