This title appears in the Scientific Report :
2021
Main design features of the Rh-based first mirror developed for the ITER CXRS core diagnostics
Main design features of the Rh-based first mirror developed for the ITER CXRS core diagnostics
Main design features of the Rh-based first mirror developed for the ITER CXRS core diagnosticsYu. Krasikov1, I. Ivashov1, W. Behr1, J. Assmann1, M. Fischer1, V. Kotov1, A. Krimmer1,T. Koppitz1, A. Litnovsky1, D. Leichtle3, O. Marchuk1, Ph. Mertens1, K. Mlynczak1, M. Rasinski1, M. Schrader1,...
Saved in:
Personal Name(s): | Krasikov, Yu. (Corresponding author) |
---|---|
Ivashov, I. / Behr, W. / Assmann, J. / Fischer, M. / Kotov, V. / Krimmer, A. / Koppitz, T. / Litnovsky, A. / Leichtle, D. / Marchuk, O. / Mertens, Ph. / Mlynczak, K. / Rasinski, M. / Schrader, M. / Le Guern, F. / Park, J. / Piqueras, J. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Imprint: |
2021
|
Conference: | 31st Symposium on Fusion Technology (SOFT 2020), virtuell (virtuell), 2020-09-20 - 2020-09-25 |
Document Type: |
Abstract |
Research Program: |
Plasma-Wand-Wechselwirkung |
Publikationsportal JuSER |
Main design features of the Rh-based first mirror developed for the ITER CXRS core diagnosticsYu. Krasikov1, I. Ivashov1, W. Behr1, J. Assmann1, M. Fischer1, V. Kotov1, A. Krimmer1,T. Koppitz1, A. Litnovsky1, D. Leichtle3, O. Marchuk1, Ph. Mertens1, K. Mlynczak1, M. Rasinski1, M. Schrader1, F. Le Guern2, J. Park3, J. Piqueras21 Institut fuer Energie- und Klimaforschung –Plasmaphysik, Forschungszentrum Juelich GmbH, 52425 Julich, Germany2 F4E - Fusion for Energy, 08019 Barcelona, Spain 3 Karlsruher Institut fuer Technologie (KIT), Institut fuer Neutronenphysik and Reaktortechnik (INR), 76344 Eggenstein-Leopoldshafen, GermanyThe ITER core charge exchange recombination spectroscopy (cCXRS), containing five in-port optical mirrors, is intended to transfer the visible light emitted by interaction of the plasma with the diagnostic neutral beam to the corresponding spectrometers. The first mirror (M1) is a key and the most vulnerable component of the diagnostics. In order to provide the required mirror lifetime, maintainability and structural integrity, M1 is composed of special materials, i.e. it is made of a thin 1 mm single-crystal rhodium (ScRh) plate diffusion bonded to a special WCu substrate. A rhodium nanocrystalline coating (NcRh) can be an option. The main mirror features are: -optical surface dimensions: 86 mm×170 mm; ScRh/NcRh material, 0.8÷1 mm thickness (≥10 μm for the coating if selected); -adjustability with 3 (2 rotations and 1 translation) DOF (degrees of freedom); -substrate electrically insulated from the ground during cleaning; -cooling via mechanical contacts;-maximum mirror operation temperature of 300C; -remote handling compatibility; -acceptable thermal distortion (within 100 fringes); -a compatibility with repetitive cleaning. The mirror can be cleaned with about 100-500 procedures of 60 MHz plasma discharges (depending on the Rh material used). The paper presents an evolution of M1 design presented in [1], [2] and [3]. The design is supported by multifield thermal, electromagnetic and structural analyses and uses experimental data of the R&D made by Forschungszentrum Juelich, Germany. The study conducted confirms the workability of the proposeddesign solutions.Parts of this work (the actual bolted solution) were supported by Fusion for Energy under the Framework Partnership Agreement F4E-FPA-408 (DG). The views and opinions expressed herein reflect only the authors’ views. Fusion for Energy is not liable for any use that may be made of the information contained in the present contribution.Keywords: ITER, CXRS diagnostics, port plug, first mirror, Rh single crystal, mirror cleaning[1] Yu. Krasikov et.al., Major aspects of the design of a first mirror for the ITER core CXRSDiagnostics, http://dx.doi.org/10.1016/j.fusengdes.2015.05.031[2] Yu. Krasikov et.al., Specific design and structural issues of single crystalline first mirrors for diagnostics, http://dx.doi.org/10.1016/j.fusengdes.2017.04.038[3] Ph. Mertens et.al,. On the use of rhodium mirrors for optical diagnostics in ITER, http://dx.doi.org/10.1016/j.fusengdes.2019.04.031 |