Center for Axion and Precision Physics Research
Research Interests:
Leading efforts for CAPP’s first microwave Axion Experiment in an ultra-low temperature setup being launched at KAIST (Korea Advanced Institute of Science and Technology) campus in summer of 2015. Overseeing sub-projects including cryogenics, development of high Q-factor resonant cavity with frequency tuning system, and designing RF receiver electronics/DAQ system.
I am currently working on the simulation and implementation of a new idea which significantly reduces coherent betatron oscillation (CBO) and muon losses in the Fermi National Accelerator Laboratory (FNAL) muon g-2 experiment (E989), and the precision tracking simulations for proton electric dipole moment (EDM) experiment at Brookhaven National Laboratory (BNL) and muon g-2/EDM experiment at Japan Proton Accelerator Research Complex (J-PARC). I am also involved in the development of a data acquisition system for the axion experiment in our group. I am interested in application of high performance computing for physics researches as well.
Yun is developing a new magnetometry experiment to search for axion-like spin-dependent interactions between nuclei at sub-millimeter ranges in ARIADNE collaboration. The experiment involves a rotating non-magnetic mass to source the axion field, and a dense gaseous ensemble of laser-polarized 3He nuclei to detect the axion field by NMR. Yun is also working on a novel experimental scheme enabling the investigation of transient exotic spin couplings to stable topological defects (e.g., domain walls) of axion-like fields with collaboration in GNOME project.
Research interests:
Finding nonzero EDM (electric dipole moment) in a fundamental particle would signal strong CP violation and consequently it could explain matter and antimatter asymmetry in our universe. Storage ring proton EDM (pEDM) experiment is one of the EDM searches using storage ring aiming sensitivity level of 10-29 e·cm.
In the pEDM experiment, polarized protons are stored in the storage ring and slowly extracted (for 1000 s) and scattered on a carbon target. Through the interaction between polarized protons and unpolarized carbon nuclei, protons experience asymmetrical force due to the spin-orbit interaction with the nucleus electric field. The asymmetry of the proton scattering can be measured by using a pair of detectors.
The detectors are the essential part of the polarimeter system. I’m working on prototype polarimeter detector development. This work includes GEM-based polarimeter detector development, Monte Carlo simulation of polarimeter system, systematic error study etc.
Research interests:
- Axion detecting experiment with interaction between particles
- Theoretical high energy physics
I am writing, testing and using simulation programs for precise particle and spin tracking in storage rings. The main applications for these programs are the proposed proton electric dipole moment (pEDM) experiment and the muon g-2 experiment. Both experiments are precision experiments and the use similar experimental techniques. The simulations are needed to test new concepts and to design the pEDM-ring.
I am studying about growth methods and electronic structures of high tc superconducting films using low temperature scanning tunneling microscopy (STM) with high magnetic field. I plan to grow high tc superconducting films under ultra high vacuum (UHV) and confirm the superconductivity of them using STM in situ. Based on the research results, I will try to develop superconducting cavities.
I have been interested in searching for anything beyond the standard model to understand what the Universe is. Now I am after the dark matter of the Universe by searching for axion. Then, the next after the dark matter will be the rest of the Universe.
Research interests:
- Trigger system design and construction for COMET experiment
- Trigger algorithm development for COMET experiment
- Signal processing electronics and DAQ system construction for CAPP Axion experiment
- Simulational efforts for Fermilab g-2 and BNL pEDM project
Broadly speaking, I am strongly interested in both aspects of the CAPP program, namely axion searches and the measurement of the proton electric dipole moment, together linked to the fundamental time reversal symmetry, ouside the traditional framework of the Standard Model of particle physics (what experts in the field call the Kobayashi-Maskawa framework). Axion searches, on the other hand, can have major cosmological consequences, whether or not an axion is discovered. Axions are in fact thought to provide most of the astronomical dark matter, which constitutes another great mistery in modern physics. My focus is currently on dark matter axion searches.
My research interests are:
Beam position monitoring
Beam profile monitoring
Spin and beam tracking
I am doing work on RF signal processing of the axion cavity experiment, focussing mainly on the room temperature signal processing. I am also interested in mythological aspects of modern physical cosmology.
My research interests lie in modern particle physics, focussing especially on the strong CP problem and one of its great candidate solutions, the axion.
Recently, I have started simulating the results of the spin-dependent interaction experiment motivated by Moody and Wilczek by the finite element method (FEM) software, OPERA.
I am working on a ground based telescope project called GroundBird to detectB-mode of the CMB polarization, which can be a smoking gun level discovery of the inflation model of our universe. The telescope is under construction in KEK/Japan. Our group is working on the focal plane optics, a small R&D on the superconducting film based resonator (MKID: Microwave Kinetic Inductance Detector) for the photon detection, and the readout electronics in the frequency domain. Till summer of 2015 is my sabbatical period at CAPP.
Research Interests
1. Axion Detecting Experiment with Resonant Cavity: Simulation with software, Measurement with hardware
2. Beam Dynamics inside Particle Collider: Simulation with C++
3. Network Simulation with Object-Oriented Programming: Image processing with Java, Network processing with Pajek
Design of HTS DC model cable, Design, simulation and fabrication of HVDC system using thyristor converter
Experiment of the HTS DC model cable with LCC-HVDC system, Superconductivity-related experiment
Simulation of power system using EMTDC & RTDS, Design of HTS DC reactor
FEM analysis of HTS coil using COMSOL Multiphysics, AC loss measurement of HTS cable and HTS magnet
Thermal network modeling of helium gas cooled HTS DC cable, High pressure, cryogenic temperature gas and gas mixture properties measuring.
Labview programming