Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique

The retroreflectors in EAST (Experimental Advanced Superconducting Tokamak) are important optical components of Polarimeter-Interferometer (POINT) system, working as the first mirrors to reflect the incident far-infrared laser. The surface morphology changing of the retroreflector has a direct impac...

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Autores principales:	Hongbei WANG, Huihui YAN, Xiaoqian CUI, Nu ZHANG, Yinxian JIE, Haiqing LIU, Hongbin DING
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Plasma wall interaction Surface morphology changing Speckle interferometry Retroreflector Nuclear engineering. Atomic power TK9001-9401
Acceso en línea:	https://doaj.org/article/9eaf34e9b914482d80dd89a7389a2836
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id	oai:doaj.org-article:9eaf34e9b914482d80dd89a7389a2836
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spelling	oai:doaj.org-article:9eaf34e9b914482d80dd89a7389a28362021-11-12T04:37:19ZStudy of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique2352-179110.1016/j.nme.2021.101087https://doaj.org/article/9eaf34e9b914482d80dd89a7389a28362021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352179121001538https://doaj.org/toc/2352-1791The retroreflectors in EAST (Experimental Advanced Superconducting Tokamak) are important optical components of Polarimeter-Interferometer (POINT) system, working as the first mirrors to reflect the incident far-infrared laser. The surface morphology changing of the retroreflector has a direct impact on the optical reflection accuracy and it will generate a significant influence on EAST plasma density measurement and plasma current distribution diagnosis. Therefore, it is essential to research the surface morphology changing of the retroreflector systematically. Laser speckle interferometry technique is considered as a most promising method for real-time monitoring the PFMs surface morphology changing at plasma discharge intervals in the near future and its measurement accuracy and reliability have been adequately verified in the laboratory. One retroreflector served in 2019–2020 EAST Campaign is selected as a representative, compared with a brand-new retroreflector, to demonstrate that microscale surface morphology changing occurred on the internal reflection planes after bearing a whole EAST campaign plasma interaction. Meanwhile, the surface morphology of each internal reflection plane appears severely different features. Further research and analysis of the surface morphology are more contributed to evaluating the damage states of the retroreflector and providing more suggestions for the improvement and protection of the retroreflector. The surface morphology reconstruction results are given through a 3D visual exhibition and laser speckle interferometry technique is proposing a new research perspective for PWI research.Hongbei WANGHuihui YANXiaoqian CUINu ZHANGYinxian JIEHaiqing LIUHongbin DINGElsevierarticlePlasma wall interactionSurface morphology changingSpeckle interferometryRetroreflectorNuclear engineering. Atomic powerTK9001-9401ENNuclear Materials and Energy, Vol 29, Iss , Pp 101087- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Plasma wall interaction Surface morphology changing Speckle interferometry Retroreflector Nuclear engineering. Atomic power TK9001-9401
spellingShingle	Plasma wall interaction Surface morphology changing Speckle interferometry Retroreflector Nuclear engineering. Atomic power TK9001-9401 Hongbei WANG Huihui YAN Xiaoqian CUI Nu ZHANG Yinxian JIE Haiqing LIU Hongbin DING Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
description	The retroreflectors in EAST (Experimental Advanced Superconducting Tokamak) are important optical components of Polarimeter-Interferometer (POINT) system, working as the first mirrors to reflect the incident far-infrared laser. The surface morphology changing of the retroreflector has a direct impact on the optical reflection accuracy and it will generate a significant influence on EAST plasma density measurement and plasma current distribution diagnosis. Therefore, it is essential to research the surface morphology changing of the retroreflector systematically. Laser speckle interferometry technique is considered as a most promising method for real-time monitoring the PFMs surface morphology changing at plasma discharge intervals in the near future and its measurement accuracy and reliability have been adequately verified in the laboratory. One retroreflector served in 2019–2020 EAST Campaign is selected as a representative, compared with a brand-new retroreflector, to demonstrate that microscale surface morphology changing occurred on the internal reflection planes after bearing a whole EAST campaign plasma interaction. Meanwhile, the surface morphology of each internal reflection plane appears severely different features. Further research and analysis of the surface morphology are more contributed to evaluating the damage states of the retroreflector and providing more suggestions for the improvement and protection of the retroreflector. The surface morphology reconstruction results are given through a 3D visual exhibition and laser speckle interferometry technique is proposing a new research perspective for PWI research.
format	article
author	Hongbei WANG Huihui YAN Xiaoqian CUI Nu ZHANG Yinxian JIE Haiqing LIU Hongbin DING
author_facet	Hongbei WANG Huihui YAN Xiaoqian CUI Nu ZHANG Yinxian JIE Haiqing LIU Hongbin DING
author_sort	Hongbei WANG
title	Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
title_short	Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
title_full	Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
title_fullStr	Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
title_full_unstemmed	Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique
title_sort	study of microscale surface morphology changing of the retroreflector in east by means of laser speckle interferometry technique
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/9eaf34e9b914482d80dd89a7389a2836
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Study of microscale surface morphology changing of the retroreflector in EAST by means of laser speckle interferometry technique

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