Experimental and numerical studies of the shutter dynamics for the ITER core CXRS diagnostic

Experimental and numerical studies of the shutter dynamics for the ITER core CXRS diagnostic

•Experimental analysis of the dynamic shutter behaviour for different setup conditions.•Optimisation of the mechanism to reach almost zero impact kinetic energy to minimise arm rebounds.•Comparison of experimental results with analytical and numerical solutions shows good accordance.•Explanation of...

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Bibliographic Details
Published in:Fusion engineering and design Vol. 123; pp. 722 - 726
Main Authors: Friese, Sebastian, Panin, Anatoly, Krasikov, Yury, Mertens, Philippe, Aßmann, Jochen
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01-11-2017
Elsevier Science Ltd
Subjects:
Actuation
Bumpers
Diagnostic systems
Diagnostics
Dynamic behaviour
Frictionless shutter
Fusion
ITER diagnostics
Kinetic energy
Nuclear physics
Numerical analysis
Optical mirror
Stiffness
Studies
Dynamic behaviour
ITER diagnostics
Frictionless shutter
Optical mirror
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Summary:•Experimental analysis of the dynamic shutter behaviour for different setup conditions.•Optimisation of the mechanism to reach almost zero impact kinetic energy to minimise arm rebounds.•Comparison of experimental results with analytical and numerical solutions shows good accordance.•Explanation of the bumper material influence on recoil velocity after the arm impact by an analytical approach. The mechanical concept of the cCXRS frictionless shutter is based on elastic lateral bending of its arms caused by pneumatic actuation and is limited by special bumpers. The shutter blocks or opens the path of light emitted by the plasma, which is under analysis, to cover the diagnostic’s first mirror. A thorough understanding of the shutter’s dynamic behaviour is indispensable to adjust the mechanical structure for the final design. Particular attention is paid to the arm rebounds that are dependent on the arms impact kinetic energy and the arms’ preloading on the bumpers. To optimise the shutter structure the simplified parametric mock-up was developed which allows variation of the arms’ stiffness, the mass, the arms preloading as well as the time evolution of the actuator pressure. The experimental results discussed in the paper are in accordance with the analytical and numerical predictions that proved to be a very effective tool for further design needs.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.05.099