First Application of an InfraRed Imaging Video Bolometer to Heliotron J Plasma

Miyashita, A.; Mukai, K.; Ohshima, S.; Matoike, R.; Peterson, B.J.; Kobayashi, S.; Okada, H.; Kado, S.; Minami, Takashi; Mizuuchi, T.; Konoshima, S.; Nagasaki, K.

doi:10.1585/pfr.16.1202079

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Cited by 3 publications

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Preliminary design of an AXUV photodiode-based bolometer camera for MT-I spherical tokamak

Hussain,

Zahid,

Javed

et al. 2024

Fusion Engineering and Design

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Preliminary design of an AXUV photodiode-based bolometer camera for MT-I spherical tokamak

Hussain,

Zahid,

Javed

et al. 2024

Fusion Engineering and Design

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Design and implementation of a prototype infrared video bolometer (IRVB) in MAST Upgrade

Reinke

Lipschultz

Thornton

et al. 2023

Review of Scientific Instruments

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A prototype infrared video bolometer (IRVB) was successfully deployed in the Mega Ampere Spherical Tokamak Upgrade (MAST Upgrade or MAST-U), the first deployment of such a diagnostic in a spherical tokamak. The IRVB was designed to study the radiation around the lower x-point, another first in tokamaks, and has the potential to estimate emissivity profiles with spatial resolution beyond what is achievable with resistive bolometry. The system was fully characterized prior to installation on MAST-U, and the results are summarized here. After installation, it was verified that the actual measurement geometry in the tokamak qualitatively matches the design; this is a particularly difficult process for bolometers and was done using specific features of the plasma itself. The installed IRVB measurements are consistent both with observations from other diagnostics, including magnetic reconstruction, visible light cameras, and resistive bolometry, as well as with the IRVB-designed view. Early results show that with conventional divertor geometry and only intrinsic impurities (for example, C and He), the progression of radiative detachment follows a similar path to that observed for large aspect ratio tokamaks: The peak of the radiation moves along the separatrix from the targets to the x-point and high-field side midplane with a toroidally symmetric structure that can eventually lead to strong effects on the core plasma inside the separatrix.

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Preliminary Design of an Axuv Photodiode-Based Bolometer Camera for Mt-I Spherical Tokamak

HUSSAIN,

Zahid,

Javed

et al. 2024

Preprint

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First Application of an InfraRed Imaging Video Bolometer to Heliotron J Plasma

Cited by 3 publications

References 5 publications

Preliminary design of an AXUV photodiode-based bolometer camera for MT-I spherical tokamak

Preliminary design of an AXUV photodiode-based bolometer camera for MT-I spherical tokamak

Design and implementation of a prototype infrared video bolometer (IRVB) in MAST Upgrade

Preliminary Design of an Axuv Photodiode-Based Bolometer Camera for Mt-I Spherical Tokamak

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