Prototype testing reveals improved space resolution in a cylindrical tracking detector using dimethyl ether.
A cylindrical tracking detector with an inner radius of one meter employing straw tubes is being envisaged for the FINUDA experiment aimed at hyper-nuclear physics at DAPHNE, the Frascati π-factory. A prototype using sevral 10mm and 20mm diameter, two meter long aluminized mylar straws has been assembled and tested with a one GeV/c pion beam. While operating with dimethyl ether gas gain, space resolution, and device systematics have been studied.A simple method of correction for systematics due to straw eccentricity has been developed and, once applied, a space resolution better than 40μm can be reached.
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