Speaker
Mr
Jerome Beucher
(Ecole des Mines de Nantes)
Description
We report on gain and discharge rate measurements with micro-pattern
gaseous detectors using micro-meshes. Some geometrical
configurations of Parallel Ionization Multiplier (PIM) and
MICROMEGAS, operated with Ne+10%CO2 gas mixture, are considered.
Tests have been performed on the T9 proton-pion beam facility at
CERN.
For MICROMEGAS configurations, the discharge rate, greater than 2x10-
7, is correlated to the thickness of the amplification gap. On the
other side, for lower probabilities, the amplification gap thickness
does not seem to be discriminant, suggesting that strong processes
take place.
With the PIM structure operated at a gain of 5000, the best
configuration allows to achieve a rate lower than 10-9. Some
elements are now understood to reduce this discharge rate with only
two amplification stages, such as using ions with greater velocities
or thinner amplification gap. R&D activities are under progress in
order to complete this study and to know the spatial resolution.
Primary author
Mr
Jerome Beucher
(Ecole des Mines de Nantes)
