Development of a 3-D tomography technique for Large Helical Device bolometry using EMC3-EIRENE grids.

Authors

Koyo Munechika, Hiroaki Tsutsui, Byron J Peterson, Kiyofumi Mukai, Gakushi Kawamura, Daihong Zhang, Felix Reimold, Gabriele Partesotti

Published in

The Review of scientific instruments. Volume 96. Issue 4. Apr 01, 2025.

Abstract

A three-dimensional (3-D) tomography technique is developed for the bolometry system in the Large Helical Device using the EMC3-EIRENE-defined mesh coordinates and the relative gradient smoothing extended to 3-D space. We utilize two types of bolometers, resistive bolometers and infra-red imaging video bolometers, to cover areas that are not visible with only one type of bolometer, the total channels of which are 1088. Although the resolution of the reconstructed solution rises to 59 400 voxels, we prove that the physically meaningful solution having little negative power is obtained by calculating geometry matrices with the tetrahedralization method and assessing the phantom emission and the synthetic data. Moreover, comparing solutions generated by conventional minimum Fisher regularization and 3-D extended relative gradient smoothing enables us to find that the latter provides a better solution.

PMID:
40202422
Bibliographic data and abstract were imported from PubMed on 09 Apr 2025.

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