A5023415454- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Advanced Radiotherapy Techniques
- Advanced X-ray Imaging Techniques
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Lanthanide and Transition Metal Complexes
- Radiation Dose and Imaging
- Semiconductor materials and devices
- Astrophysics and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Nuclear Physics and Applications
- Life Cycle Costing Analysis
- Magnetic confinement fusion research
- Brain Metastases and Treatment
- Advanced Data Storage Technologies
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
Korea University
2021-2024
Sejong University
2022
Kyungpook National University
2007-2014
Pohang University of Science and Technology
2002-2006
Pohang Accelerator Laboratory
2002-2006
Lawrence Berkeley National Laboratory
1999
The status of the research on muon colliders is discussed and plans are outlined for future theoretical experimental studies. Besides continued work parameters a 3-4 0.5 TeV center-of-mass (CoM) energy collider, many studies now concentrating machine near 0.1 that could be factory s-channel production Higgs particles. We discuss various components in such colliders, starting from proton accelerator needed to generate pions heavy-Z target proceeding through phase rotation decay ($\pi \to \mu...
We describe the status of our effort to realize a first neutrino factory and progress made in understanding problems associated with collection cooling muons towards that end. summarize physics can be done factories as well intense cold beams muons. The potential muon colliders is reviewed, both Higgs Factories compact high energy lepton colliders. timescale research development reviewed latest designs channels including promise ring coolers achieving longitudinal transverse simultaneously....
We have developed a high-resolution cavity-beam position monitor (BPM) to be used at the focal point of ATF2, which is test beam line that now being built demonstrate stable orbit control $\ensuremath{\sim}\mathrm{\text{nanometer}}$ resolution. The design cavity structure was optimized for Accelerator Test Facility (ATF) in various ways. For example, has rectangular shape order isolate two dipole modes orthogonal directions, and relatively thin gap less sensitive trajectory inclination. A...
This study presents a comprehensive physics design and optimization investigation of an electron injector system for the Korea fourth-generation storage ring (Korea-4GSR) light source with target operating energy around 200 MeV. The Korea-4GSR construction project is currently underway expected to continue until 2027. comprises thermionic dc gun, buncher systems, four accelerating cavities (ACs). gun was designed achieve combination low emittance high current. Through beam dynamics...
The machine-specific reference (msr) correction factors ( kQmsr,Q0fmsr,fref$k_{{Q_{{\rm{msr}}}},\;{Q_0}}^{{f_{{\rm{msr}}}},{f_{{\rm{ref}}}}}$ ) were introduced in International Atomic Energy Agency (IAEA) Technical Report Series 483 (TRS-483) for dosimetry of small fields. Several factor sets exist a Leksell Gamma Knife (GK) Perfexion or Icon. Nevertheless, experiments have not rigorously validated the from different studies.This study aimed to assess role and accuracy values determining...
Beam position monitors (BPMs) with a resolution in few nanometers range are required to control beams the locations that close interaction point (IP) of international linear collider (ILC). ATF2 at KEK has considered as test facility investigate this requirement. In order measure beam stability final focus, kind IP-BPM been developed and it tested ATF extraction line. We have designed an lower Q-value than line achieve smaller resolution. It enables easier separation individual bunches...
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We investigate the ion instability in ILC electron damping ring with high beam intensity and low-emittance. It is shown that can cause oscillations grow exponentially give a significant limitation ring. have performed weak-strong simulation to show characteristic phenomena of In particular, we investigated effects various different bunch filling patterns, vacuum pressures feedback system on fast-ion instability. also be cured by bunch-bunch per about 50 turns.
High bunch compression in two compressors is required to achieve a peak beam current of about 3.5 kA PAL-XFEL. We investigated effects longitudinal space charge wake and geometrical linac on microbunching instability for the PAL-XFEL design stage. show that significant energy modulation can be generated by enhance coherent synchrotron radiation In this paper, we evaluated total gain 3.7 GeV accelerator system. The evaluation was obtained performing analytical calculations integral equation [1].
The infrared (IR) free-electron laser (FEL) which is in design stage at Pohang Light Source a self-amplified spontaneous emission (SASE) system that driven by 60 MeV to 100 test linac facility. We present results of the numerical simulation for IR SASE-FEL PLS. It shown high-gain with 1.5 mum radiation wavelength 61 electron beam from S-band rf and about 5 m long undulator. generation third harmonic bunching fundamental also investigated as purpose toward enhancing usefulness facility In...
We investigated simulations on the effects of wakefield emittance growth at 2.5 GeV PLS linac. The initial beam offset, bunch charge, misalignments a accelerating structures and magnets are considered in simulation. It is shown that BNS damping effectively reduces growths due to these causes. Based simulation results, maximum possible current per for stable operation linac estimated be 3 nC
Abstract Background : A polystyrene phantom was developed following the guidance of International Atomic Energy Association (IAEA) for gamma knife (GK) quality assurance. Its performance assessed by measuring absorbed dose rate to water and distributions. Methods The made polystyrene, which has an electron density (1.0156) similar that water. included one outer four inner phantoms. Two phantoms held PTW T31010 Exradin A16 ion chambers. One a film in XY plane Leksell coordinate system,...
Stored beam currents of 2.0 GeV at the PLS ring has been limited by coupled-bunch instabilities. It was found that in mainly 830.45 MHz transverse mode RF cavities. Beam instabilities dependences on betatron tune and chromaticity were extensively investigated ring. Longitudinal due to 758.66 1300 modes does not lead loss up 450 mA. The tail distribution lifetime 2.5 are estimated a simulation method. result shows 27 hours 170 good agreement with normal operation.