CDC Straw Sag photos
From GlueXWiki
Gravitational Sag of various tubes
We have tried to compare the gravitational sag of three identical lengths of the straw material. The Lumina mylar straw, the Stone Kapton straw and the Euclid mylar straw. With the straws supported at both ends, the is slightly more sag in the kapton than either of the mylar straws but very hard to measure.
With the 76cm long straws supported it at one end, the katon straw sags about 4-5mm more than either of the mylar straws. One can roughly see this in the pictures below. The left-hand straw is the Stone kapton straw. The middle straw is the Lumina mylar straw and the right-hand straw is the euclid mylar straw. Note that these straws are about 1/2 the length of the final straws in the CDC.
