Welcome on triple GEM detectors R&D

A triple GEM detector for X rays imaging has been made using the standard 10x10cm² GEM foil produced by CERN.

The detector is visible in the picture below mounted on a scan system in front of a Molybdenum X ray source.

On the back side of the detector is mounted the new motherboard based on FPGA.
The counting rates are sent directly to the network through an ethernet connector.

The anode of the triple GEM detector is equipped with a row of 128 pads;
Each pad has a dimension of 0.5x0.5 mm².

The magnified image of some pads is visible on this picture alongside.

An X ray source has been set at 30 KV with a current of 300 microampere.

Moving the detector trasversally to the beam with a speed of 5 mm/sec,
an image of the beam spot produced by a policapillary lens has been obtained as shown in this movie

A grid realized with kapton foil and copper cladding on both side and 600 micron holes drilled on it with 2 mm pitch,
has been palced between the source and the detector.

Mooving the detector in front of the grid, an image is obtained as shown in this movie.

Each column is acquired in 100 ms.The display dimension is 9x7 cm²