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Charge-Integration-Mode Detection for Measurements of Particle Beams
이경세,홍병식,G. Jhang,M. Jo,E. Ju,B. S. Moon,박성근,H. B. Rhee,H. H. Shim,심광숙 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
In this paper, we report on the beam-detection technique in a charge-integration mode. The novel radiation-detection method has been applied to detectors for quantitative measurements of proton and fast-neutron beams. First, we developed a beam detector equipped with a scintillation-fiber array and a 46-channel silicon photodiode to measure proton-beam induced fast neutrons. Second, the scintillator fibers in the detector were replaced by LYSO crystals to measure proton beams provided by a 50-MeV proton cyclotron. The detectors operating in the current detection technique were tested with fast-neutron and proton beams provided by the MC50 proton cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS). We conclude from the beam tests that the current detectors operating in the charge-integration mode are capable of qualified and reliable measurements both for proton and fast-neutron beams.
Development of a Li-Coated RPC for Low-Energy Neutron Detection
이경세,심광숙,김병일,홍병식,김현철,김지현,이광복,Mikiko Ito,류민상,홍성종,안성환,박성근,강태임 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
In this report, we present a newly developed hybrid resistive plate chamber (RPC) for the detection of low-energy neutrons. Lithium-°uoride (LiF) enriched for the 6Li isotope was chosen as the material sensitive to low-energy neutrons for the construction of the hybrid RPC. The LiF-coated RPC was tested by using the 252Cf neutron-irradiation facility at the Korea Atomic Energy Research Institute (KAERI). The detection e±ciency of the double-layered LiF-coated RPC to neutrons in the energy range from 10 to 560 meV was approximately 1.6 %. We obtained reliable e±ciency plateaus over a wide range of electric-.eld intensities.
Radiation Tests for a Single-GEM-Loaded Gaseous Detector
이경세,홍병식,박성근,Sang Yeol Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
We report on a systematic study of a single-gas-electron-multiplier (GEM)-loaded gaseous detectordeveloped for precision measurements of high-energy particle beams and for dose verification inparticle therapy. In the present study, a 256-channel prototype detector having an active area of 16× 16 cm2 and operating using a continuous current-integration-mode signal-processing method wasmanufactured and tested with X-rays emitted from a 70-kV X-ray generator and 43-MeV protonsprovided by the MC50 proton cyclotron at the Korea Institute of Radiological and Medical Science(KIRAMS). The amplified detector response was measured for X-rays with an intensity of about5 × 106 Hz cm−2. The linearity of the detector response to the particle flux was examined andvalidated by using 43-MeV proton beams. The non-uniform development of the amplification forthe gas electrons in space was corrected by applying a proper calibration to the channel responses ofthe measured beam-profile data. We conclude from the radiation tests that the detector developedin the present study will allow us to perform quality measurements of various high-energy particlebeams and to apply the technology to dose-verification measurements in particle therapy.
Scintillation-Fiber Detection for Dose Verification in Hadron Therapy
이경세,홍병식,Genie Jhang,주은아,김총,박성근,이한범,심현하,심광숙 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.4
In this paper, we report on the development of a scintillation-fiber detection method for dose verification in hadron therapy. In order to achieve the position sensitivity required for precision measurement of doses, a detector composed of 1-mm-thick scintillation fibers and a multi-channel photodiode was constructed and tested with 45-MeV proton beams provided by the MC50 proton cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS). The results of the beam test showed that the spatial resolution of the data determined by using the standard deviation σ was ∼1.0 mm, which is sufficiently accurate to verify beam-induced doses in hadron therapy. Furthermore, the quantitative accuracy appearing in the data is on the order of ∼1%. We expect the detector composed of scintillation fibers and operating in the charge-integration mode to allow us to perform quality measurement of doses in various hadron therapies.
Development of Thin Gaseous Ionization Detectors for Measurements of High-energy Hadron Beams
이경세,홍병식,이기수,박성근,유재희,Sang Yeol Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.7
Thin gaseous ionization detectors have been developed based on a current-integration mode formeasurements of high-energy hadron beams. In the present detector R&D, two different types ofprototype detectors with an active area of 16 × 16 cm2, each equipped with 256-signal processingchannels, were manufactured and tested with 43-MeV protons provided by the MC50 proton cyclotronat the Korea Institute of Radiological and Medical Science (KIRAMS). The first one wasequipped with a single gas electron multiplier (GEM), and the second one was a thin-plane ionizationdetector without the GEM foil loaded. The linearities of the detector responses for bothdetectors were examined for various proton-beam intensities. The quantitative accuracies for thechannel-response data and for the total detector responses measured for 43-MeV protons were 0.4%and 0.34%, respectively. We conclude from the beam test that operating both types of detectors inthe current-integration mode will allow quality measurements of dynamic-mode hadron beams tobe performed with accuracies of better than 1%.
Development of a LYSO-array Detector for Measurement of Proton-beam Pro¯les
이경세,B. S. Moon,B. Hong,J. Jang,M. S. Jeong,M. Jo,E. A. Ju,S. Park,K. S. Sim 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
Here, we report on the development of a beam-scan detector that can quantitatively measure proton-beam profiles. The core component of the beam-scan detector is composed of 46 0.9-mm-thick LYSO (lutetium yttrium oxyorthosilicate) scintillators. The LYSO-scintillator array was equipped with a 46-channel silicon photodiode and current-mode signal processing electronics. The beam-scan detector was tested with 45-MeV proton beams provided by the MC50 proton cyclotron at the Korea Institute of Radiological and Medical Science (KIRAMS). This system has been shown to reliably detect and measure proton-beam profiles at currents ranging from 1 to 5 nA. We expect the current beam detector operating in the charge-integration mode to allow us to perform qualify measurements for therapeutic proton and heavy-ion beams.
이경세(K.S. Lee),백제현(J.H. Baek) 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.-
A field reconstruction scheme for a cell centered finite volume method on unstructured meshes is developed. Regardless of mesh quality, this method is exact within a machine accuracy if the solution is linear, which means it has full second order accuracy. It does not have any limitation on cell shape except convexity of the cells and recovers standard discretization stencils at structured orthogonal grids. Accuracy comparisons with other popular reconstruction schemes are performed on a simple example.
Development of a Lift Correction Method for Shear Flow Effects in BEM Theory
이경세(Lee, Kyung Seh),정진화(Jung, Chin Hwa),박현철(Park, Hyun Chul) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
In this study, the effects of shear flows around a 2-dimensional airfoil, S809 on its aerodynamic characteristics were analyzed by CFD simulations. Various parameters including reference inflow velocity, shear rate, angle of attack, and cord length of the airfoil were examined. From the simulation results, several important characteristics were found. Shear rate in a flow makes some changes in the lift coefficient depending on its sign and magnitude but angle of attack does not have a distinguishable influence. Cord length and reference inflow also cause proportional and inversely proportional changes in lift coefficient, respectively. We adopted an analytic expression for the lift coefficient from the thin airfoil theory and proposed a modified form applicable to the traditional load analysis procedure based on the blade element momentum theory. Some preliminary results applied to an well known load simulation software, FAST, are presented.