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

M. Rubel (Corresponding Author), J. P. Coad, G. De Temmerman, Antti Hakola, D. Hole, Jari Likonen, I. Uytdenhouwen, A. Widdowson

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

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, ?5-7 mm.
Original languageEnglish
Pages (from-to)818-822
JournalNuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume623
Issue number2
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Surface morphology
Mirrors
Deposits
mirrors
deposits
Plasmas
Peeling
Disintegration
Beryllium
Surface analysis
Deuterium
peeling
Optical systems
Chemical elements
disintegration
Erosion
beryllium
charge exchange
entrances
erosion

Keywords

  • Diagnostic mirrors
  • Erosion and deposition
  • ITER
  • JET
  • Reflectivity
  • Surface analysis

Cite this

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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' 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, ?5-7 mm.",
keywords = "Diagnostic mirrors, Erosion and deposition, ITER, JET, Reflectivity, Surface analysis",
author = "M. Rubel and Coad, {J. P.} and {De Temmerman}, G. and Antti Hakola and D. Hole and Jari Likonen and I. Uytdenhouwen and A. Widdowson",
year = "2010",
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",
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}

First Mirrors Test in JET for ITER : An overview of optical performance and surface morphology. / Rubel, M. (Corresponding Author); Coad, J. P.; De Temmerman, G.; Hakola, Antti; Hole, D.; Likonen, Jari; Uytdenhouwen, I.; Widdowson, A.

In: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 623, No. 2, 2010, p. 818-822.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - First Mirrors Test in JET for ITER

T2 - An overview of optical performance and surface morphology

AU - Rubel, M.

AU - Coad, J. P.

AU - De Temmerman, G.

AU - Hakola, Antti

AU - Hole, D.

AU - Likonen, Jari

AU - Uytdenhouwen, I.

AU - Widdowson, A.

PY - 2010

Y1 - 2010

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, ?5-7 mm.

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, ?5-7 mm.

KW - Diagnostic mirrors

KW - Erosion and deposition

KW - ITER

KW - JET

KW - Reflectivity

KW - Surface analysis

U2 - 10.1016/j.nima.2010.01.069

DO - 10.1016/j.nima.2010.01.069

M3 - Article

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

SN - 0168-9002

IS - 2

ER -