Back-Surface Temperature Measurements of Thin Tungsten Materials during Plasma-Gun Generated Pulsed Plasma Irradiation using a Fast Two-Color Pyrometer

Sakuma, I.; Kikuchi, Yusuke; Isono, Wataru; Nakazono, Takumi; Nakane, Masato; Fukumoto, N.; Nagata, Masayoshi

doi:10.1585/pfr.10.1205089

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…The energy density of 1 MJ/m 2 was irradiated in 0.2 ms. The detail of the PG experiment can be found in refs [ ]. With this device, an Al‐coated W specimen was irradiated.…”

Section: Resultsmentioning

confidence: 99%

Simulation study on the vapour shielding at solid walls under transient heat loads using weighted particle model

Ibano

Kikuchi

Tanaka

et al. 2018

Contributions to Plasma Physics

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Vapour shielding at solid walls is expected for a future fusion reactor in case of large heat load due to transient events. In order to estimate the dissipation of the incoming heat flux by the vapour shielding, a simulation code called PIXY, using a weighted particle model, is developed. First, a validation study is undertaken. Vapour shielding of an aluminium‐coated tungsten specimen was experimentally observed in a plasma gun device. Results are reproduced by the PIXY simulation. Then, the code is applied to the transient edge‐localized mode (ELM) heat flux for the reactor condition. It was found that the ion–neutral collision, as well as radiative cooling, is a dominant phenomenon for the heat flux dissipation in both cases. As the maximum heat flux increases, oscillating phenomena appear remarkably, which have been observed in other experimental studies on vapour shielding.

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“…The energy density of 1 MJ/m 2 was irradiated in 0.2 ms. The detail of the PG experiment can be found in refs [ ]. With this device, an Al‐coated W specimen was irradiated.…”

Section: Resultsmentioning

confidence: 99%

Simulation study on the vapour shielding at solid walls under transient heat loads using weighted particle model

Ibano

Kikuchi

Tanaka

et al. 2018

Contributions to Plasma Physics

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Comparison of a two-wavelength pyrometer system and spectral pyrometry for high-temperature measurements

Aljohani,

Alshunaifi,

Alqahtani

et al. 2024

Appl. Opt.

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A pyrometer system is an optically passive, non-intrusive method that uses thermal radiation law to determine temperature. It combines electronic and optical instruments to detect low-level signals of radiation measurements. Surface high-temperature measurements are successfully obtained using a two-wavelength pyrometer system. This study used a pyrometer system to achieve high stability, minimize errors due to changing emissivity, and remove background noise from the radiation measurement for surface high-temperature measurements. Temperature measurements were also obtained from Planck’s model, and the results were compared with logarithmic assumption. The precision of these measurements is improved through variable optimization of the instruments, validation of the data, and calibration of the pyrometer system. The 16 temperature measurements were obtained (800–1600°C temperature measurement range) with a correlation coefficient above 97%. The response time between temperature readings is within 785 µs. Furthermore, the high-temperature measurements were obtained with higher stability (±2.99∘C at 1600°C) and less error (less than 2.29% for Si sensor). In addition, the error of the temperature measurement was reduced from 5.33% to 0.86% at 850°C by using Planck’s model compared with using logarithmic assumption. A cooling system temperature is also optimized to reduce the error temperature reading. It was found to be at 10°C that the uncertainty was reduced from 2.29% at ambient temperature to 1.53% at 1600°C. The spectral pyrometry system was also used in comparison with the two-wavelength pyrometer system to confirm that the calibration curves of the spectral pyrometry can be used to determine temperature measurements.

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Characterization of CT Plasmas on a Magnetized Coaxial Plasma Gun Device and its Application to Pulse High Heat Flux Simulation Tests

et al. 2016

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Back-Surface Temperature Measurements of Thin Tungsten Materials during Plasma-Gun Generated Pulsed Plasma Irradiation using a Fast Two-Color Pyrometer

Cited by 3 publications

References 6 publications

Simulation study on the vapour shielding at solid walls under transient heat loads using weighted particle model

Simulation study on the vapour shielding at solid walls under transient heat loads using weighted particle model

Comparison of a two-wavelength pyrometer system and spectral pyrometry for high-temperature measurements

Characterization of CT Plasmas on a Magnetized Coaxial Plasma Gun Device and its Application to Pulse High Heat Flux Simulation Tests

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