September 20, 2010 Technical note Open Access

G. Raffone

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    <subfield code="a">&lt;p&gt;The demand of large area GEM detectors requires extreme working conditions of the layered foils from structural point of view; larger area need higher biaxial tensile loads to overcome large deflections and the related stresses may exceed the copper yield limit just around the holes; the present work shows that for a trapezoidal CMS GEM foil (W=1040 mm; L1=530 mm; L2=345 mm) the sag due its own weight is about f =28.6 &amp;mu;m (electrostatic loads not included) for a tensioning of S=1 N/mm; the related stresses are lower than the yield only in a biaxial load. Numerical results are from ANSYS Educational v.10 [1] and their level of accuracy is very good when compared to some theoretical and experimental results.&lt;br&gt;
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