  Gas electron multiplier (GEM) is widely used in modern gas detectors of
ionizing radiation in experiments on high-energy physics at accelerators and in
other fields of science. Typically the GEM devices are based on a dielectric
foil with holes and electrodes on both sides. GEMs made by radiation-hard
dielectrics or wide band-gap semiconductors are desirable for some
applications. The results of the first tests of the gas electron multiplier
made of radiation-hard materials, such as polycrystalline CVD diamond with a
thickness of 100 microns is described. Here we report on fabrication of GEM
based on free-standing polycrystalline CVD diamond film and its first test.
