Plasma and Fusion Research

Volume 14, 1405042 (2019)

Regular Articles

Ray Trace Study for Visible Spectroscopy Reference System (VSRS) Diagnostics in ITER
Shin KAJITA, Maarten DE BOCK1), Michel DESJARDINS2) and Robin BARNSLEY1)
Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan
ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France
Topequa, Avenue Campagne Barielle, 13013 Marseille, France
(Received 17 December 2018 / Accepted 24 January 2019 / Published 25 February 2019)


The visible spectroscopy reference system (VSRS) diagnostic will be used to measure the continuum visible light emitted from the plasma in ITER. Because the field of view of the VSRS system is aligned to a hole on a blanket module with a retroreflector on the bottom, which will be shared with an interferometer measurement, it has a potential to be free from the stray light, which may disturb signals for optical diagnostics in ITER. In this study, performance of the stray light reduction in the VSRS is investigated using a ray tracing simulation. We investigated the influences of the reflection property of the retroreflector and first mirror for the signal and stray light intensity.


ITER, visible spectroscopy reference system (VSRS), spectroscopy, stray light, ray tracing

DOI: 10.1585/pfr.14.1405042


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