Title
Thermo-mechanical analysis of retro-reflectors for interferometry and polarimetry in W7-X
Author
Köppen, M.
Hirsch, M.
Ernst, J.
Vliegenthart, W.A.
Ye, M.Y.
Bykov, V.
Schauer, F.
Publication year
2011
Abstract
The stellarator Wendelstein 7-X (W7-X) is presently under construction at the Max-Planck-Institut für Plasmaphysik in Greifswald, Germany. The plasma density profile will be measured by two-colour interferometry where for each line of sight through the plasma the phase shifts of two far-infrared laser beams are compared. Due to the 3D shape of the superconducting coils in W7-X, opposite ports are not available. Instead, corner cube retro-reflectors (CCR) will be incorporated in the plasma vessel heat shield that reflect the beams back to the entrance window and diagnostic. This requires high accuracy of the reflecting surfaces which will be subjected to thermal loads from plasma radiation and therefore be heated up, displaced and deformed during operation. ANSYS is used to perform coupled thermo-mechanical analyses of the CCR, including plasma radiation, thermal conduction, and radiation between all parts. The resulting displacements provide the inputs to MATLAB routines which then yield local deformations, curvature radii, and tilting of the reflecting surfaces. This information is used to optimize the design of the CCR and their fixations. © 2011 Elsevier B.V. All Rights Reserved.
Subject
Physics & Electronics
SSE - Space Systems Engineering
TS - Technical Sciences
Aviation
FE-analysis
Interferometry
Polarimetry
Retro-reflectors
Thermo-mechanical
W7-X
3-D shape
Corner cube retro-reflectors
Coupled thermo-mechanical
Curvature radii
Density profile
Entrance window
Far infrared lasers
FE analysis
Germany
Heat shields
Line of Sight
Local deformations
Plasma radiation
Plasma vessels
Reflecting surface
Retro-reflectors
Super-conducting coils
Thermal conduction
Thermo-mechanical
Thermo-mechanical analysis
Two-colour interferometry
W7-X
WENDELSTEIN 7-X
Cyclotron resonance
Ellipsometry
Infrared devices
Plasma density
Plasmas
Polarimeters
Radiation
Reflection
Three dimensional
Interferometry
To reference this document use:
http://resolver.tudelft.nl/uuid:f9001dce-c199-422c-ac17-217deaacc60d
TNO identifier
443017
ISSN
0920-3796
Source
Fusion Engineering and Design, 86 (6-8), 1166-1169
Document type
article