A5026875958- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Radiomics and Machine Learning in Medical Imaging
- Cancer Genomics and Diagnostics
- solar cell performance optimization
- Video Surveillance and Tracking Methods
- Gait Recognition and Analysis
- Cancer Immunotherapy and Biomarkers
- Human Pose and Action Recognition
- Physics of Superconductivity and Magnetism
- Engineering Applied Research
- Advanced Fluorescence Microscopy Techniques
- Internet of Things and Social Network Interactions
- Non-Invasive Vital Sign Monitoring
- Refrigeration and Air Conditioning Technologies
- Underwater Vehicles and Communication Systems
- Crystallography and Radiation Phenomena
- Acute Lymphoblastic Leukemia research
- Semiconductor Quantum Structures and Devices
- Photocathodes and Microchannel Plates
Korea University
2023-2024
Korea Basic Science Institute
2024
Pohang University of Science and Technology
2012-2023
Pohang Accelerator Laboratory
2012-2023
Sungkyunkwan University
2023
Korean Red Cross
2023
Gachon University
2022
Argonne National Laboratory
2016
Pohang TechnoPark (South Korea)
2010
Inje University Busan Paik Hospital
2009
Background The inflamed immune phenotype (IIP), defined by enrichment of tumor-infiltrating lymphocytes (TILs) within intratumoral areas, is a promising tumor-agnostic biomarker response to checkpoint inhibitor (ICI) therapy. However, it challenging define the IIP in an objective and reproducible manner during manual histopathologic examination. Here, we investigate artificial intelligence (AI)-based phenotypes capable predicting ICI clinical outcomes multiple solid tumor types. Methods...
Abstract There had been remarkable progress in developing third-generation electron storage rings as the main sources of very bright photon beams. Fourth-generation based on multi-bend achromat lattice concept may be able to surpass brightness and coherence that are attained using present rings. In this paper, we survey ongoing work around world develop concepts designs for fourth-generation
After 14 years of successful operation, the Pohang Light Source (PLS) has completed PLS-II upgrade to meet increasing demand from growing user community. The increased beam energy 2.5 GeV 3 GeV; number insertion devices been by a factor two (20 IDs); and current 400 mA 200 mA. emittance reduced below 10 nm while retaining existing PLS tunnel as well injection system. During six months commissioning in latter half 2011, we have successfully achieved device operations top-up with 100 5.8...
The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
The lattice type of Korea 4th Generation Storage Ring (Korea-4GSR) is determined as hybrid multi-bend achromat (HMBA) after a comparison three types (MBA) lattices because HMBA provides sufficiently low beam emittance and good nonlinear dynamics with the smallest number sextupole magnets among lattices. We also propose use bending beamlines 2 T centre (CBMs). Considering type, longitudinal gradient reverse magnet were used to reduce damping wigglers being considered further. ring design...
Background Immune-evading severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants are emerging continuously. The clinical effectiveness of monoclonal antibody agents that exhibit decreased in vitro activity against SARS-CoV-2 needs to be elucidated. Methods A nationwide, multicenter, retrospective cohort study was designed evaluate the regdanvimab, an anti-SARS-CoV-2 agent. Regdanvimab prescribed South Korea before and after emergence delta variant, which regdanvimab but...
A bunch-by-bunch measurement system has been developed at Pohang Light Source II. The consists of a four-channel button pick-up, 20 GHz sampling oscilloscope and an 800 MHz low-pass digital filter. Upon measuring spatio-temporal beam motion matrix over many turns, singular-value decomposition analysis is used to reveal the dominant coupled-bunch modes. can diagnose injection oscillations due kicker errors effect resistive-wall impedance that gives rise instability during operation.
Structure wakefield acceleration (SWFA) is one of the most promising AAC schemes in several recent strategic reports, including DOE's 2016 Roadmap, report on Advanced and Novel Accelerators for High Energy Physics Roadmap (ANAR), Accelerator Beam Research Goals Opportunities. SWFA aims to raise gradient beyond limits conventional radiofrequency (RF) accelerator technology, thus RF beam energy efficiency, by reducing breakdowns from confining microwave a short (on order about 10 ns) intense...
This paper presents the required structure and function of a ring-FEL as radiation source for extreme ultraviolet lithography (EUVL). A 100 m-long straight section that conducts an extremely low emittance beam from fourth-generation storage ring can increase average power at 13.5 nm wavelength to up 1 kW without degrading in rest ring. Here, simulation results EUVL are described.
The transverse position of the electron beam in Pohang Light Source-II is stabilized by global orbit feedback system. A slow system has been operating at 2 Hz, and a fast (FOFB) 813 Hz was installed recently. This FOFB consists 96 electron-beam-position monitors, 48 horizontal correctors, vertical correctors Versa Module Europa bus control We present design implementation its test result. Simulation analysis presented future improvements are suggested.
To realize and test advanced accelerator concepts hardware, a beam line is being reconfigured in the linac extension area (LEA) of Argonne Advanced Photon Source (APS) linac. A photocathode rf gun installed at beginning APS will provide low emittance electron into LEA line. The thermionic for storage ring be accelerated through an interleaved fashion. In this paper, design studies interleaving lattice realization described with initial experiment result.
There are increasing interests in high temperature superconducting(HTS) undulator with a gradual increase of engineering current density REBCO conductor. Additionally, no-insulation(NI) winding technique may maximize the field HTS undulators mainly benefited from its density. In this study, we present several design options an NI to investigate anticipated performance terms magnetic strength. Specifically, maximum along beam axis depending on gap, period length, dimension, and operating is...
This paper describes the beam dynamic simulation with transfer matrix method for cyclotron. Starting from a description on equation of motion in cyclotron, lattice functions were determined and solutions 2nd-order nonlinear Hamiltonian introduced used phase space particle tracking. Based dynamics code was also developed cyclotron design.
This paper describes the beam dynamic simulation with transfer matrix method for four sector cyclotron. Starting from a description on equation of motion in cyclotron, lattice functions were determined and solutions 2nd-order nonlinear Hamiltonian introduced used phase space particle tracking. Based dynamics code was also developed cyclotron design.
Storage rings that use the hybrid multi-bend achromat (MBA) lattice concept [1] have been realized. The main characteristics of MBA as a typical for 4th generation storage ring are to adopt two large dispersion bumps in cell, and make -I-transformation between cancel nonlinear effects. To increase effectiveness control, analytical investigation phenomenon is essential. In this paper, we describe with driving term simple model. We obtained similar results existing time-consuming MOGA...
A multi-objective genetic algorithm (MOGA) is a powerful global optimization tool, but its results are considerably affected by the crossover parameter η c . Finding an appropriate demands too much computing time because MOGA needs be run several times in order to find good In this paper, self-adaptive introduced strategy adopt new for every generation while running MOGA. This scheme has also been adopted multi-generation Gaussian process (MGGPO) when producing trial solutions. Compared with...
One of the possible obstacles for future high temperature superconductor (HTS) undulator is undesirable field distribution changes due to screening current induced (SCF). In this study, we investigated effects SCF short period planar magnet using a numerical simulation, specifically H-formulation with nonlinear BH curve iron core considered. First, used periodic analysis model investigate <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Pohang Light Source (PLS) [1] had operated for 14 year successfully. To meet the request of increasing user community, PLS-II that is upgrade project PLS have been carried out. Main design goals lattice are to increase beam energy 3 GeV, number insertion devices by factor two (20 IDs), current 400 mA and reduce emittance below 10 nm with existing tunnel injection system. Following desired criteria, DBA chosen such full storage ring includes 12 long straight sections short installation...