Dynamic performance of frictionless fast shutters for ITER: Numerical and analytical sensitivity study for the development of a test program

Panin, Anatoly; Mertens, Philippe; Schrader, Michael; Nemov, Alexander; Khovayko, Mikhail; Krasikov, Yury; Neubauer, Olaf; Biel, Wolfgang

doi:10.1016/j.fusengdes.2015.06.089

Journal Article

FZJ-2015-06174

Dynamic performance of frictionless fast shutters for ITER: Numerical and analytical sensitivity study for the development of a test program

Panin, A. (Corresponding author)FZJ* ; Khovayko, M. ; Krasikov, Y.FZJ* ; Nemov, A. ; Biel, W.FZJ* ; Mertens, P.FZJ* ; Neubauer, O.FZJ* ; Schrader, M.FZJ*

2015
Elsevier New York, NY [u.a.]

Fusion engineering and design 96-97, 903 - 906 (2015) [10.1016/j.fusengdes.2015.06.089]

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Abstract: To prolong a lifetime of the ITER first diagnostic mirrors some protective shutters can be engaged. A concept of an elastic shutter that operates frictionless in vacuum has been studied at the Forschungszentrum Jülich, Germany. Under actuation two shutter arms (∼2 m long) bend laterally between two pairs of limiting bumpers thus shielding the optical aperture or opening it for measurements. To increase the shutter efficiency the transition time between its open and closed states can be minimized. This demands a fast shutter that operates in fractions of a second and exhibit essentially dynamic behavior, like impacts with the bumpers that cause the shutter arms’ bouncing and oscillations.The paper presents numerical studies of the shutter dynamic behavior using the explicit and implicit 3D FE transient structural modeling. Simple 1D analytical model was developed to predict the shutter impact kinetic energy that mostly determines its further dynamic response. The structure sensitivity to different parameters was studied and ways for its optimization were laid down. A parametric shutter mockup with easily changeable mechanical characteristics was manufactured. A test program aimed for further shutter optimization, basing on the analysis performed and engaging powerful capabilities of the parametric shutter mockup is discussed in the paper.

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