This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1016/j.jnucmat.2009.01.153 in citations.
Erosion and deposition behaviour of a-C:H layers in the private flux region of the JET MKII-HD divertor
Erosion and deposition behaviour of a-C:H layers in the private flux region of the JET MKII-HD divertor
Material deposition was measured in the private flux region of JET by means of a quartz microbalance (QMB) for similar to 11900 s of successive plasma discharges with moderate additional heating (2-3 MW). The QMB was located under the load bearing septum replacement plate with a view towards the inn...
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Personal Name(s): | Esser, H. G. |
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Kreter, A. / Philipps, V. / Widdowsen, A.M. / Coad, J.P. | |
Contributing Institute: |
Plasmaphysik; IEF-4 |
Published in: | Journal of nuclear materials, 390-391 (2009) |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2009
|
DOI: |
10.1016/j.jnucmat.2009.01.153 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Journal of Nuclear Materials
390-391 |
Subject (ZB): | |
Publikationsportal JuSER |
Material deposition was measured in the private flux region of JET by means of a quartz microbalance (QMB) for similar to 11900 s of successive plasma discharges with moderate additional heating (2-3 MW). The QMB was located under the load bearing septum replacement plate with a view towards the inner divertor. In total a similar to 270 nm thick hydrogenated amorphous carbon layer was measured assuming; a density of 1 g/cm(3) correlated with a fluence of 2.36 x 10(23) D+ ions into a toroidal section of 1 cm length of the inner divertor. The area of the QMB in the private flux region was deposition dominated when the inner strike point position was on the vertical tiles, line-of-sight with the quartz crystal, and turned into erosion solely by moving the strike point from vertical tile 3 to horizontal tile 4. The most likely reason is a change of the C/D flux ratio of the particles impinging on QMB turning this area from a deposition to an erosion dominated region. (C) 2009 Elsevier B.V. All rights reserved. |