Increased accuracy and signal-to-noise ratio through recent improvements in Infra-Red Video Bolometer fabrication and calibration
The Infra-Red Video Bolometer (IRVB) is a diagnostic equipped with an infra-red camera that measures the total radiated power in thousands of LOSs within a large field of view (FOV). Recently validated in MAST-U, it offers a high spatial resolution map of the radiated power in the divertor region, w...
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Language | English |
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11.06.2024
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Abstract | The Infra-Red Video Bolometer (IRVB) is a diagnostic equipped with an
infra-red camera that measures the total radiated power in thousands of LOSs
within a large field of view (FOV). Recently validated in MAST-U, it offers a
high spatial resolution map of the radiated power in the divertor region, where
large gradients are expected. The IRVB's sensing element comprises a thin layer
of high Z absorbing material, typically Platinum, usually coated with Carbon to
reduce reflections. It is here explored the possibility of using a relatively
inert material like Titanium, that can be produced in layers up to 1mum
compared to 2.5mum for Pt, and then coat it with Pt of the desired thickness
(0.3mum per side here) and Carbon. This leads to a higher temperature signal (2
to 3 times), and better spatial resolution (about 4 times), resulting in higher
accuracy in the measured power. This assembly is also expected to improve foil
uniformity, as the Pt layer is obtained via deposition rather than mechanical
processes. Given its multi-material composition, measuring the thermal
properties of the foil assembly is vital. Various methods using a calibrated
laser as a heat source have been developed, analysing the temperature profile
shape or fitting the calculated laser power for different intensities and
frequencies. It is here presented a simpler approach, that relies on analysing
the separate components of the foil heat equation for a single laser exposure
in a given area. This can then be iterated over the entire foil to capture
local deviations. |
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AbstractList | The Infra-Red Video Bolometer (IRVB) is a diagnostic equipped with an
infra-red camera that measures the total radiated power in thousands of LOSs
within a large field of view (FOV). Recently validated in MAST-U, it offers a
high spatial resolution map of the radiated power in the divertor region, where
large gradients are expected. The IRVB's sensing element comprises a thin layer
of high Z absorbing material, typically Platinum, usually coated with Carbon to
reduce reflections. It is here explored the possibility of using a relatively
inert material like Titanium, that can be produced in layers up to 1mum
compared to 2.5mum for Pt, and then coat it with Pt of the desired thickness
(0.3mum per side here) and Carbon. This leads to a higher temperature signal (2
to 3 times), and better spatial resolution (about 4 times), resulting in higher
accuracy in the measured power. This assembly is also expected to improve foil
uniformity, as the Pt layer is obtained via deposition rather than mechanical
processes. Given its multi-material composition, measuring the thermal
properties of the foil assembly is vital. Various methods using a calibrated
laser as a heat source have been developed, analysing the temperature profile
shape or fitting the calculated laser power for different intensities and
frequencies. It is here presented a simpler approach, that relies on analysing
the separate components of the foil heat equation for a single laser exposure
in a given area. This can then be iterated over the entire foil to capture
local deviations. |
Author | Lovell, Jack J Mukai, Kiyofumi Wurden, G. A Federici, Fabio Peterson, Byron J |
Author_xml | – sequence: 1 givenname: Fabio surname: Federici fullname: Federici, Fabio – sequence: 2 givenname: Jack J surname: Lovell fullname: Lovell, Jack J – sequence: 3 givenname: G. A surname: Wurden fullname: Wurden, G. A – sequence: 4 givenname: Byron J surname: Peterson fullname: Peterson, Byron J – sequence: 5 givenname: Kiyofumi surname: Mukai fullname: Mukai, Kiyofumi |
BackLink | https://doi.org/10.48550/arXiv.2406.07139$$DView paper in arXiv |
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Snippet | The Infra-Red Video Bolometer (IRVB) is a diagnostic equipped with an
infra-red camera that measures the total radiated power in thousands of LOSs
within a... |
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SubjectTerms | Physics - Instrumentation and Detectors Physics - Plasma Physics |
Title | Increased accuracy and signal-to-noise ratio through recent improvements in Infra-Red Video Bolometer fabrication and calibration |
URI | https://arxiv.org/abs/2406.07139 |
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