Abstract
We present some important results related to Micromegas-TPC development for rare event detection:First, we show the influence of the detection plane structure on the energy resolution, where, replacing the wires planes (MWPC) by the Micromegas micropattern, gave a high collection efficiency with good uniformity and good energy resolution.Second, we prove that the increase of the height of the amplification zone permits a good charge collection at higher gas pressure.Third, we present a new gas mixture ‘‘Xe(98)CF4(2)’’, which is convenient for the search of neutrinoless double beta decay in 136Xe.Fourth, large size Micromegas, with 50 cm of diameter is operated in the Gotthard-TPC (200 l) and showed high effciency and good energy resolution with low energy sources.
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