arXiv subjects

Woodo Lee

Publications and source records attributed to Woodo Lee.

3 recordsLinked to original sources

arXiv2021

A development of a compact software package for systematic error studies in muon $g-2$/EDM experiment at J-PARC

The J-PARC muon g-2/EDM experiment aims to measure the muon magnetic moment anomaly $a_μ = (g -2 ) / 2 ~ $. The target sensitivity for $a_μ$ is a statistical uncertainty of $450 \times 10^{-9}$, and $a_μ$ can be extracted by measuring the spin precession of muons ($ω_a$). The $ω_a$ can be extracted from the distribution of muon decay time, and the time is measured by reconstructing tracks of positrons which are decayed from the muons. To extract $ω_a$ precisely, the systematic effects on $ω_a$ should be controlled under the aforementioned sensitivity. To study systematic effects, we develop a compact simulation package, and using our developed package, we study several systematic effects and discuss results. We discuss the package details and studies of systematic effects on $ω_a$ based on our package.

physics.ins-det↗

arXiv2021

A Framework for Recognizing and Estimating Human Concentration Levels

One of the major tasks in online education is to estimate the concentration levels of each student. Previous studies have a limitation of classifying the levels using discrete states only. The purpose of this paper is to estimate the subtle levels as specified states by using the minimum amount of body movement data. This is done by a framework composed of a Deep Neural Network and Kalman Filter. Using this framework, we successfully extracted the concentration levels, which can be used to aid lecturers and expand to other areas.

cs.LG↗

arXiv2021

A fabrication of low power distribution system for muon $g-2$/EDM experiment at J-PARC

The J-PARC muon $g - 2$/EDM experiment aims to measure the muon magnetic moment anomaly $a_μ = (g -2) / 2 ~ $ and the muon electric dipole moment (EDM) $d_μ$. The target sensitivity for $a_μ$ is a statistical uncertainty of $450 \times 10^{-9}$, and for $d_μ$ it is $1.5 \times 10^{-21}$ $e \cdot \rm{cm}$. The readout electronics require a DC to DC converter to provide 1.5 V and 3.3 V electric voltage within a specific environment. To capture the positron decay from the muon, the detector components are placed in the muon storage area where a 3 T magnetic field is applied in a vacuum. The extra magnetic field from the converter should be less than 30 $μ$T to reach the aforementioned sensitivity on $a_μ$. In addition, the electric field produced by the converter has to be as small as 1 V/m to also reach the target sensitivity on $d_μ$. For this purpose, we develop a step-down converter. We discuss the development process and the performance of our DC to DC converter for the J-PARC muon $g - 2$/EDM experiment.

physics.ins-det↗