Optimizing ITER bolometer cameras in view of internal reflections and crosstalk between channels

Meister, H. (author), Kudashev, I. (author), Brank, Matic (author), Ingesson, L. C. (author)

Bolometer cameras in ITER (lat.: the way) are designed as pinhole and collimator cameras, optimizing the requirements from available physical space, constraints in design options and desired line-of-sight (LOS) distribution. While for both camera types of internal reflections can be significant and lead to an increase in the effective viewing cone, collimator cameras may also suffer from crosstalk of light between channels in case internal apertures are not optimized. The concepts and simulations employed to optimize bolometer collimator cameras are presented. They are based on geometrical considerations for choosing the number and distribution of internal apertures, using the desired viewing cones as input. In the second step, ray-tracing simulations based on the Raysect packages are applied to assess internal reflections as a function of wavelength in the range IR to X-rays for the chosen geometry as well as to assess the impact of choices for material and material finishings (e.g., roughness). Examples presented focus on port-mounted bolometer cameras. The results allow us to improve the geometrical description of bolometer cameras in the ITER database of synthetic diagnostics and thus support performance assessments and studies in the preparation of tomographic reconstructions of plasma radiation. For example, the calculated measurements for LOS assuming standard radiation distributions for ITER are presented.

• Language: English
• Keywords: bolometer, diagnostics, plasma physics
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 7 str.
• Numbering: Vol. 52, no. 9
• PID: 20.500.12556/RUL-166784
• UDC: 533
• ISSN on article: 0093-3813
• DOI: 10.1109/TPS.2024.3386255
• COBISS.SI-ID: 193397507
• Publication date in RUL: 24.01.2025

Record is a part of a journal

• Title: IEEE transactions on plasma science
• Shortened title: IEEE trans. plasma sci.
• Publisher: Institute of Electrical and Electronics Engineers
• ISSN: 0093-3813
• COBISS.SI-ID: 8828933

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: bolometer, diagnostika, fizika plazme

Projects

• Funder: Fusion for Energy
• Project number: F4E-FPA-384-SG05