Abstract :
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A new type of micromesh, based on etching techniques, has been developed for the
Micromegas detector. In this paper, we will briefly describe this new design
and give some results about the performances obtained in different gas
mixtures. The geometry of the mesh allows good uniformity of the electrostatic
field. An energy resolution of 11.7 \% (FWHM) is obtained with X-rays at 5,9
keV and 5.4 \% at 22 keV in a Argon/Isobutane (90\%/10\%) gas mixture. This
is a significant improvement for a gaseous detector operating at high gain
(about 5000).
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