Gem stretcher.
With this tool we are able to stretch the gem.
The frames are realized in G10 with different width : 1,2 or 3 mm.
They are glued with Ciba Epoxy 2010 on the stretched gem foil.
The frames are piled up with any washing procedure.
Gem Detector cross section.
All electrodes are connected to small plugs used to supply HV to the GEMs
The gas tight box.
Detectors are
assembled in a class 100 laminar flow bench.
GEMs are stacked in a gas-tight G10 box above the pads.
With this facility we have built several detectors (about
15 chambers) with different configuration of gaps between gems.
In the picture is visible the gems piled-up and assembled with the white
screws, the black o-ring, the HV connectors, and the box cover.
The detector is finally supplied with hv and gas. The Gem detector has been tested with XRay and particle beams at CERN and PSI.
Gain measurements.
The gain measurements have been performed with the X-Ray source.
The gain is a exponential function of the sum of gem voltages and can reach 10^5.
