Calibration and thermal test results of prototype bolometer sensors for ITER fusion reactor

For over 10 years, several bolometer sensors with different properties have been tested in the IBOVAC facility. The aim has been to develop a bolometer sensor that can be operated in ITER and can withstand harsh operating conditions. For this purpose, important physical properties of the sensors, i....

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Veröffentlicht in:Review of scientific instruments 2023-03, Vol.94 (3), p.033503-033503
Hauptverfasser: Jahanbakhsh, Sina, Hare, Jack Davies, Meister, Hans, Ingesson, Christian, Majewski, Marcin, Penzel, Florian, Schmitt, Stefan, Walach, Ulrich, Dubois, Marc
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container_issue 3
container_start_page 033503
container_title Review of scientific instruments
container_volume 94
creator Jahanbakhsh, Sina
Hare, Jack Davies
Meister, Hans
Ingesson, Christian
Majewski, Marcin
Penzel, Florian
Schmitt, Stefan
Walach, Ulrich
Dubois, Marc
description For over 10 years, several bolometer sensors with different properties have been tested in the IBOVAC facility. The aim has been to develop a bolometer sensor that can be operated in ITER and can withstand harsh operating conditions. For this purpose, important physical properties of the sensors, i.e., cooling time constant τ, normalized heat capacity κ, and normalized sensitivity sn, have been characterized in a vacuum condition and at various temperatures up to 300 °C. The calibration is achieved by ohmic heating of the sensor absorbers by applying a DC voltage and recording exponential current fall during heating. Recently, a Python program was developed to analyze the data and extract the above mentioned parameters including the uncertainties from recorded currents. In the present series of experiments, the latest prototype sensors developed for ITER are tested and evaluated. These include three different sensor types: two with Au absorbers on ZrO2 membranes (self-supporting substrate sensors) and one with Au absorbers on Si3N4 membranes supported by a Si frame (supported membrane sensors). Tests revealed that the sensor with ZrO2 substrate can only be operated up to 150 °C, while the supported membrane sensors passed the tests up to 300 °C successfully. These results will be used, together with other upcoming tests, such as irradiation testing, to select the most suitable sensors to be employed in ITER.
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The aim has been to develop a bolometer sensor that can be operated in ITER and can withstand harsh operating conditions. For this purpose, important physical properties of the sensors, i.e., cooling time constant τ, normalized heat capacity κ, and normalized sensitivity sn, have been characterized in a vacuum condition and at various temperatures up to 300 °C. The calibration is achieved by ohmic heating of the sensor absorbers by applying a DC voltage and recording exponential current fall during heating. Recently, a Python program was developed to analyze the data and extract the above mentioned parameters including the uncertainties from recorded currents. In the present series of experiments, the latest prototype sensors developed for ITER are tested and evaluated. These include three different sensor types: two with Au absorbers on ZrO2 membranes (self-supporting substrate sensors) and one with Au absorbers on Si3N4 membranes supported by a Si frame (supported membrane sensors). Tests revealed that the sensor with ZrO2 substrate can only be operated up to 150 °C, while the supported membrane sensors passed the tests up to 300 °C successfully. 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Tests revealed that the sensor with ZrO2 substrate can only be operated up to 150 °C, while the supported membrane sensors passed the tests up to 300 °C successfully. 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source American Institute of Physics (AIP) Journals; Alma/SFX Local Collection
subjects Absorbers
Bolometers
Calibration
Fusion reactors
Heating
Membranes
Nuclear power plants
Parameter uncertainty
Physical properties
Prototypes
Sensors
Substrates
Time constant
Zirconium dioxide
title Calibration and thermal test results of prototype bolometer sensors for ITER fusion reactor
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