Plasma cleaning of beryllium coated mirrors

被引：29
|
作者：
Moser, L. [1 ]
Marot, L. [1 ]
Steiner, R. [1 ]
Newman, M. [2 ]
Widdowson, A. [2 ]
Ivanova, D. [3 ]
Likonen, J. [4 ]
Petersson, P. [3 ]
Pintsuk, G. [5 ]
Rubel, M. [3 ]
Meyer, E. [1 ]
机构：
[1] Univ Basel, Ecole Polytech Fed Lausanne, Dept Phys, Assoc EURATOM Confederat Suisse,SPC, CH-1015 Lausanne, Switzerland
[2] CCFE EURATOM Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
[3] Royal Inst Technol, Alfven Lab, Assoc EURATOM VR, S-10044 Stockholm, Sweden
[4] VTT Tech Res Ctr Finland, POB 1000, Espoo 02044, Finland
[5] Forschungszentrum Julich, EURATOM Assoc, D-52425 Julich, Germany
[6] EUROfus Consortium, JET, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
来源：
PHYSICA SCRIPTA | 2016年 / T167卷
关键词：
ITER; JET; beryllium; plasma sputtering; first mirrors; DIAGNOSTIC MIRRORS; ITER;
D O I：
10.1088/0031-8949/T167/1/014069
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.
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页数：6
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