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 -