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RISS 인기검색어
- 검색키워드
- 저자 : Changhie Hahn (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Measurement of a 2-MeV Electron Beam Flux by Using an Aluminum-Nitride Detector
Byung Moon,Changhie Hahn,David Holcomb,유동선,Ilgon Kim,Yoon Cho 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
A small aluminum-nitride detector of 3 mm $\times$ 3 mm $\times$ 0.387 mm in size fabricated at the Oak Ridge National Laboratory is used to measure the 1 MeV $\sim$ 2 MeV electron beam from a beam facility at the Korea Atomic Energy Research Institute. Our objective is to check the linearity of the generated electric current relative to the electron beam intensity and to see if the electric current generated can be used as a measurement of the flux intensity. The results show that if the electric voltage applied to the detector is 2,000 V or higher and if the data are taken in a sufficiently short period of time so that the heat build up inside the detector is negligible, then the measured electric current increases linearly as the flux intensity increases. Hence, the measured value can be used as an estimate of the flux intensity, provided that one prior measurement of the beam with the given energy is available.
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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.
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