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Fabrication of a GEM Detector and Its Signal Readout with a Homemade Readout Board
Seongtae Park,Changhie Hahn,Byungsoo Moon,Chongeun Jung,유동선,Ilgon Kim,Kiwan Jang 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
The gas electron multiplier (GEM) chamber fabricated in this experiment had a double GEM structure, and Ar and CO$_2$ gases were used as the counting and the quencher gases, respectively, with a mixing ratio of Ar : CO$_2$ = 80 : 20. A homemade readout board was used to read the electric signals from the GEM detector. The analog-to-digital converter (ADC) was synchronized with the trigger signal, and the converted digital values were fed to a personal computer (PC) by the data acquisition (DAQ) program. The whole detector system was tested with an Fe-55 radiation source (5.9 keV), and we calculated the mass attenuation coefficients for a Cu and an Ar/CO$_2$ gas mixture under 5.9 keV X-ray irradiation. From the results, we found that the Cu film (cathode) played an important role in the signal generation.