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Inner Tracker Design Studies for a Large Gaseous Tracker Detector
원은일,하현청,J.H. Choi,S.K. Park,Y.I. Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
Experiments at the future linear collider project may answer long-standing questions in elementary particle physics and cosmology, such as what the origin of particle mass is, whether the concept of space-time should be extended, and how the universe was created. We present the technology choice, the optimization process, and the expected performance of the inner trackers currently proposed in the large-detector concept for the future linear collider project.
Simulation and Fabrication of a KID Sensor for the CMB Polarization Measurement
원은일,이경민,Mitsuhiro Yoshida 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.3
We designed prototype Kinetic Inductance Detectors (KID) to test sensors for a Cosmic MicrowaveBackground (CMB) experiments. The design has been simulated extensively with a commerciallyavailable software for the optimization of the KID sensor. A coplanar waveguide typephoto mask is designed and a KID sensor is fabricated with Nb thin film. The goal of this designand fabrication of the protype KID is to understand behaviors of basic design parametersand fundamental properties of the sensor. The basic resonator parameters are measured and theirimplications are discussed.
An implementation of spin-dependent hadron elastic scattering in GEANT4
정호용,원은일,Semertzidis Yannis K.,Stephenson Edward J.,Park Seongtae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.6
An implementation of the spin-dependent differential cross-section is discussed for the elastic hadron–nucleus scattering process in the GEANT4. To validate our implementation, real measurement results of proton-carbon cross-section are compared and the results are discussed. This implementation is applied to study a proposed experiment on the proton electric dipole moment in particular the systematic effects of the experiment.
Design and Simulation of a High-Density Fast Amplifier with 180-nm Technology
하현청,원은일,김석기,Youngkwon Jo 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.2
An application-specific integrated circuit of a preamplifier and shaper has been designed to be used for readout of high-density sensors such as silicon microstrip detectors. The chip is designed with 180-nm technology and is optimized with respect to the shaping time and the reset capability. The detailed simulations show that a gain of 15 mV/fC may be achieved with the design.
Simulation and Characterization of a Dual-type 3-Dimensional Silicon Detector
최지훈,이경민,원은일 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.11
A three-dimensional (3D) silicon detector is an alternative semiconductor detector for high radiation environments. The 3D detector has several advantages such as radiation hardness so it can be used for a longer period of time in a high radiation environment without replacement. A dual-type 3D silicon detector is simulated, and the full depletion voltage, capacitance, response time and charge collection efficiency are measured.
Development of a New Analysis Framework for the SuperBelle Experiment
Soohyung Lee,원은일,Ryosuke Itoh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
The analysis framework plays a key role in high energy physics experiments. A new framework is under development to advance the current analysis framework in the Belle experiment. The new framework supports complete object-oriented analyses. It also supports more powerful and efficient ways to manage parallel processing in all of symmetric multiprocess (SMP), network clusters, and grid computing system. In this paper, the current development status of the new framework is discussed, with emphasis on parallel processing. The analysis framework plays a key role in high energy physics experiments. A new framework is under development to advance the current analysis framework in the Belle experiment. The new framework supports complete object-oriented analyses. It also supports more powerful and efficient ways to manage parallel processing in all of symmetric multiprocess (SMP), network clusters, and grid computing system. In this paper, the current development status of the new framework is discussed, with emphasis on parallel processing.
Jang Seunghyeok,원은일,Lee Kyungmin,Jeon Eunju,Ko Young Ju 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.85 No.5
The design of neutrino experiments and the analysis of neutrino data rely on precise computations of neutrino oscillations and scattering processes in general. Motivated by this, we developed a unifed software package that calculates the expected number and energy spectrum of neutrino events in the liquid scintillation detector taking into account the neutrino fux at production, the oscillations of neutrinos during propagation and their interactions in the detectors. We also implemented the calculation of neutrino fux from nuclear reactors, the Sun, and radioactive isotopes to explorer various experimental setups using a single package. This software package is validated by reproducing the result of calculations and observations in other publications. We also demonstrate the feasibility of this package by calculating the sensitivity of a liquid scintillation detector, currently in planning, to the sterile neutrinos. This work is expected to be utilized to identify the physics potential and optimize the design of future neutrino experiments.
Improved Performance of the Preamplifier-Shaper Design for a High-Density Sensor Readout System
Eugene S. Hong,원은일,유재혁 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
We are developing a preamplifier-shaper Application-Specific Integrated Circuit (ASIC) with a Dongbu-Anam 0.18um process at the Korea University Elementary Particle Physics laboratory. The first prototype was produced in 2006 and was tested It immediately showed several serious problems and its initial performance is discussed in detail here. The design of the new improved second prototype has been completed and is ready to be submitted. The expected performance of the second prototype, based on simulations, is discussed in detail. We are developing a preamplifier-shaper Application-Specific Integrated Circuit (ASIC) with a Dongbu-Anam 0.18um process at the Korea University Elementary Particle Physics laboratory. The first prototype was produced in 2006 and was tested It immediately showed several serious problems and its initial performance is discussed in detail here. The design of the new improved second prototype has been completed and is ready to be submitted. The expected performance of the second prototype, based on simulations, is discussed in detail.
Measurements of Cesium Radioisotopes in Cesium Compounds
Y.D.Kim,U.K.Kang,J.M.Choi,H.K.Jang,R.K.Jain,S.C.Kim,S.K.Kim,T.Y.Kim,이현수,S.E.Lee,H.Park,I.H.Park,원은일,H.S.Won,H.Y.Yang,M.S.Yang,M.J.Hwang,H.J.Kim,Y.J.Kwon,J.H.Lee,I.S.Cho,D.H.Choi,S.H.Noh,I.T.Yu,J.H.Kim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.3
We have measured impurity levels of radioactive isotopes, especially 137Cs and 134Cs , in various cesium compounds using HPGe detectors for the rst time. The 137Cs contamination levels of cesium iodide (CsI) powder samples that are commercially available were between 9.7 mBq/kg and 80 mBq/kg. With these levels of the contamination, 137Cs will be the most serious background source in the low energy region E < 100 keV for CsI crystal. An upper limit of the 137Cs contamination level in pollucite powder, from which CsI powders are extracted, was set to be 5.8 mBq/kg at a 90 % condence level. It should be possible to fabricate the CsI crystal with much less 137Cs contamination than the currently available CsI crystal.