First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology

M. Rubel; J.P. Coad; G. De Temmerman; A. Hakola; D. Hole; J. Likonen; Inge Uytdenhouwen; A. Widdowson; JET-EFDA contributors; Rachid Chaouadi

doi:10.1016/j.nima.2010.01.069

First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology

M. Rubel, J.P. Coad, G. De Temmerman, A. Hakola, D. Hole, J. Likonen, Inge Uytdenhouwen, A. Widdowson, JET-EFDA contributors, Rachid Chaouadi

Research output › peer-review

Abstract

Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits’ disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, l ~5–7µm.

Original language	English
Pages (from-to)	818-822
Journal	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	623
Issue number	2
DOIs	https://doi.org/10.1016/j.nima.2010.01.069
State	Published - Oct 2010

Access to Document

10.1016/j.nima.2010.01.069License: Other

Cite this

Rubel, M., Coad, J. P., De Temmerman, G., Hakola, A., Hole, D., Likonen, J., Uytdenhouwen, I., Widdowson, A., contributors, JET.-EFDA., & Chaouadi, R. (2010). First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 623(2), 818-822. https://doi.org/10.1016/j.nima.2010.01.069

@article{f4e0de650f104fd7931c15ec44b89cb4,

title = "First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology",

abstract = "Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits{\textquoteright} disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, l ~5–7µm.",

keywords = "Diagnostic mirrors, Surface analysis, reflectivity, erosion and deposition, JET, ITER",

author = "M. Rubel and J.P. Coad and {De Temmerman}, G. and A. Hakola and D. Hole and J. Likonen and Inge Uytdenhouwen and A. Widdowson and JET-EFDA contributors and Rachid Chaouadi",

note = "Score = 10",

year = "2010",

month = oct,

doi = "10.1016/j.nima.2010.01.069",

language = "English",

volume = "623",

pages = "818--822",

journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier B.V.",

number = "2",

}

Rubel, M, Coad, JP, De Temmerman, G, Hakola, A, Hole, D, Likonen, J, Uytdenhouwen, I, Widdowson, A, contributors, JET-EFDA & Chaouadi, R 2010, 'First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 623, no. 2, pp. 818-822. https://doi.org/10.1016/j.nima.2010.01.069

TY - JOUR

T1 - First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology

AU - Rubel, M.

AU - Coad, J.P.

AU - De Temmerman, G.

AU - Hakola, A.

AU - Hole, D.

AU - Likonen, J.

AU - Uytdenhouwen, Inge

AU - Widdowson, A.

AU - contributors, JET-EFDA

A2 - Chaouadi, Rachid

N1 - Score = 10

PY - 2010/10

Y1 - 2010/10

N2 - Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits’ disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, l ~5–7µm.

AB - Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits’ disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, l ~5–7µm.

KW - Diagnostic mirrors

KW - Surface analysis

KW - reflectivity

KW - erosion and deposition

KW - JET

KW - ITER

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_108438

UR - http://knowledgecentre.sckcen.be/so2/bibref/7244

U2 - 10.1016/j.nima.2010.01.069

DO - 10.1016/j.nima.2010.01.069

M3 - Article

SN - 0168-9002

VL - 623

SP - 818

EP - 822

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

IS - 2

ER -