Perspectives of Use of Diagnostic Mirrors with Transparent Protection Layer in Burning Plasma Experiments

Mukhin, E. E.; Razdobarin, G.; Семенов, В. В.; Tolstyakov, S. Yu.; Kochergin, M. M.; Курскиев, Г. С.; Podushnikova, K.A.; Андреев, А. Н.; Davydov, Denis; Rastegaeva, M. G.; Khimich, Yuriy P.; Gorshkov, V.N.; Nikitin, D. B.; Litnovsky, A.

doi:10.1063/1.2905100

Cited by 6 publications

(11 citation statements)

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“…Thus the behavior in ITER of Al mirrors or mirrors with Al 2 O 3 coating (as suggested in (Table 1). [18]) would depend on the working conditions: energy and fluxes to mirror surface of ions and atoms of hydrogen isotopes, fluxes of oxygen-containing molecules, mirror temperature, etc. This statement would also be valid for mirrors that have other dielectric coatings of a high reactive ability to form hydrides.…”

Section: Discussionmentioning

confidence: 99%

Optical properties of Al mirrors under impact of deuterium plasma ions in experiments simulating ITER conditions

Bardamid

Belyaeva

Davis

et al. 2009

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 99%

Optical properties of Al mirrors under impact of deuterium plasma ions in experiments simulating ITER conditions

Bardamid

Belyaeva

Davis

et al. 2009

Journal of Nuclear Materials

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“…Mirror Materials: Another passive protection technique is the proper way for optical component material selection. It may be materials characterized by either less deposition rate of hydrocarbon films [20] or high reflectivity mirrors [21]. Deposition-induced spectral distortion of reflectivity can be minimized using high reflective mirror materials [21] (see Fig.2).…”

Section: Advanced Protective Techniquesmentioning

confidence: 99%

“…It may be materials characterized by either less deposition rate of hydrocarbon films [20] or high reflectivity mirrors [21]. Deposition-induced spectral distortion of reflectivity can be minimized using high reflective mirror materials [21] (see Fig.2). The hydrocarbon and amorphous carbon films are practically transparent in visible and IR range.…”

Section: Advanced Protective Techniquesmentioning

confidence: 99%

“…For example, Fig.2 b&c demonstrates blue shift of the reflection in a silver mirror protected by 210 nm sapphire layer. [21].…”

Section: Advanced Protective Techniquesmentioning

confidence: 99%

“…In addition, the regular shaped interference pattern (a number of interference fringes per spectrum channel) specific to thick protective coating >10 λ is preferable for handling severe deposition. In this case, dielectric coating can be used as a supporting structure [21]. Further efforts are necessary and being performed to develop tailor-made protected mirrors with high reflection coefficient, expected to tolerate neutron irradiation, sputtering and heating up to 250 o C. However, it does not mean that high reflectivity mirrors need no cleaning.…”

Section: Fig2 Reflection Spectra Of Deposited Metal Mirrors (A) Mo mentioning

confidence: 99%

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Progress in the development of deposition prevention and cleaning techniques of in-vessel optics in ITER

et al. 2009

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The lifetime of optical components unprotected from reactor grade plasmas may be very short due to contamination with carbon and beryllium-based materials eroded by plasma from beryllium walls and carbon tiles. Deposits result in a significant reduction of optical transmission. In addition, even rather thin and transparent deposits can dramatically change the shape of reflectance spectra owing to interference of reflected beams, especially for mirrors with rather low reflectivity, like W or Mo. Development of optics-cleaning and deposition-mitigating techniques is a key factor in the construction and operation of optical diagnostics in ITER. The most severe problem faces optical elements positioned in the divertor region. The latest achievements in protection of in-vessel optics are presented by example of deposition prevention/cleaning techniques for inmachine components of a Thomson scattering system in divertor. Careful consideration of well-known and novel protection approaches shows that neither of them provides guaranteed survivability of the first in-vessel optics in divertor. Only a set of mutually complementing prevention/cleaning techniques, that include special materials for mirrors and inhibition additives for plasma, is able to manage the challenging task. The essential issue, which needs to be addressed in the nearest future, is an extensive development of introduced techniques under experimental conditions (exposure time and contamination fluxes) similar to those expected in ITER.

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Fusion—Reactor Materials

Litnovsky¹,

Ďuran²,

Coenen³

et al. 2021

Encyclopedia of Nuclear Energy

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Perspectives of Use of Diagnostic Mirrors with Transparent Protection Layer in Burning Plasma Experiments

Cited by 6 publications

References 1 publication

Optical properties of Al mirrors under impact of deuterium plasma ions in experiments simulating ITER conditions

Optical properties of Al mirrors under impact of deuterium plasma ions in experiments simulating ITER conditions

Progress in the development of deposition prevention and cleaning techniques of in-vessel optics in ITER

Fusion—Reactor Materials

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