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

@article{f731b5c90a794cb8b53a5e7ad3481eee,
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 -