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A Gas Electron Multiplier with a thick insulator such as a 100 mum or 150 mum thick insulator (Thick-GEM) has been developed by dry etching successfully in Japan. The electric field inside a hole of the Thick-GEM was calculated and the basic properties of the Thick-GEM were measured. A much stronger electric field can be realized inside the hole of the Thick-GEM than that of a GEM with a 50 mum thick...
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