Geunwoo Kim
Geunwoo Kim

Ph.D. Candidate

Pohang University of Science and Technology (POSTECH)
Last updated: Oct 22, 2026

👋 Hello, I’m Geunwoo!

I’m a Ph.D. candidate in Advanced Nuclear Engineering at POSTECH, working with Professor Moses Chung. My research interests span beam diagnostics, longitudinal beam dynamics, and feedback control.

My ongoing work addresses two practical questions: when to stop an iterative phase space reconstruction before it overfits measurement noise, and how to tune the coupler of an RF deflecting cavity.

Building on these interests, I would like to explore how orbit feedback and RF control can work together to improve beam stability in storage rings.

Interests
  • Digital LLRF and beam feedback control
  • Longitudinal beam dynamics and manipulation
Education

  • Integrated M.S.–Ph.D. in Advanced Nuclear Engineering

    2024 - Present

    POSTECH

  • B.E. in Electrical and Information Engineering

    2019 - 2023

    Korea University (Sejong), Great Honors

Recent News

🎉 Received the Best Poster Presentation Award at the 2026 KAPRA & KPS/DPP Conference.

🎉 Selected as a 2025 KOSAF Outstanding Master's Scholar in Science and Engineering.

🎉 Selected as one of the outstanding graduate students

🖐️ Joined a CaPhE lab.

🎉 First paper was accepted from JINST!

🎓 Graduated from Korea University as B.E. (Great Honors).

Research

Research direction

Integrated orbit and RF feedback

Exploring coordinated orbit and RF control for improved beam stability.

Ongoing work

(Under revision) Adaptive stopping criterion for longitudinal beam phase space tomography

Using cross-validation to stop reconstruction before it overfits measurement noise.

Revised coupler tuning for HEM₁₁ deflecting cavities

Identifying shorting-plunger positions for Kyhl tuning of HEM₁₁ deflecting cavities.

Synchrotron tune diagnostics in x direction for low-alpha storage rings

Evaluating transverse betatron sidebands as a readout of synchrotron motion.

Publications

J: Journal article · C: Conference proceeding · *: Corresponding author · †: Co-corresponding author

Journal articles

Impact factors correspond to publication years.

[J1] Three data-selection approaches for beam position monitor offline calibration Geunwoo Kim,  E.-S. Kim,  J.W. Kwon,  S. Jang*
Journal of Instrumentation, IF = 1.3, 2024

Conference proceedings

[C5] Electromagnetic design study of a 500 MHz subharmonic buncher for the PLS-II linac Geunwoo Kim,  M. Chung*,  C. Kim†
33rd Linear Accelerator Conference (LINAC2026), 2026
[C4] RF Design of an S-band HEM₁₁ Transverse Deflecting Cavity for eLABs at PAL Geunwoo Kim,  K. Kim,  Y.-J. Park,  C.-K. Min,  M. Chung*
33rd Linear Accelerator Conference (LINAC2026), 2026
[C3] Design Study of a Large-Aperture Capacitive Pick-up Type Bunch Shape Monitor for Nonrelativistic Ion Beams C. Na,  Geunwoo Kim,  D. Kwak,  M. Chung*
33rd Linear Accelerator Conference (LINAC2026), 2026
[C2] Studies of longitudinal phase space tomography using booster cavity and dipole spectrometer Geunwoo Kim,  D. Kwak,  M. Chung*
14th International Beam Instrumentation Conference (IBIC2025), 2025
[C1] (Domestic) Development of a hand motion classification system using surface EMG and IMU H.-C. Lee,  S.-G. Choi,  Geunwoo Kim,  G.-H. Ryu,  S.-U. Kim,  H.-J. Hwang*
KIIT Conference, 2020
Awards & Honors
(Domestic) Best Poster Presentation Award, 2026 KAPRA & KPS/DPP Conference
(Domestic) Master’s Outstanding Scholarship (Science and Engineering), KOSAF, 2025
(Domestic) Grand Prize in Accelerator Physics Problem Solving, Korea Particle Accelerator School (KoPAS), 2025
(Domestic) POSTECHIAN Fellowship (Creativity)
Granted to exceptional among incoming graduate students, POSTECH, 2024.
(International) Gold Award for Elegant Simulation Hands-on Training
The outstanding group project based on Elegant (Particle tracking simulation), ISBA2023, 2023.
(Domestic) Outstanding Award, 2023 Accelerator Summer School at Korea University
Great Honors
Students who took 17 or more credits each semester and graduated with a GPA of 4.0/4.5 or higher, Korea University, 2023.
Dean’s List
Students who took 17 or more credits and achieved a 4.5/4.5 GPA, Korea University, 2022.
Semester High Honors
Awarded for strong academic performance across multiple semesters, Korea University, 2020-2022.

Education

  • Integrated M.S.–Ph.D. in Advanced Nuclear Engineering

    2024 – Present

    POSTECH

  • B.E. in Electrical and Information Engineering

    2019 – 2023

    Korea University (Sejong), Great Honors

Experience

  1. Trainee Student

    Institute for Rare Isotope Science (IRIS/IBS)
    • Data analysis of beam position monitors and study of analog electronic components.

  2. Summer Student

    Helmholtz-Zentrum Berlin (HZB)
    • Analysis of longitudinal eigenfrequency of electron beam and measurement from horizontal coordinate.