Md Wahidur Rahman
Portrait of Md Wahidur Rahman

Accelerator Physics · Beam Dynamics · RF and High Power Microwave · Computational Electromagnetics

Md Wahidur Rahman

Research Associate in Accelerator Physics
Brookhaven National Laboratory

I work on accelerator physics research for the Electron-Ion Collider (EIC), with interests in beam dynamics, wakefields and impedance, RF systems, electron beam–wave interaction, and simulation-driven modeling for advanced accelerator applications.

LinkedIn Brookhaven National Laboratory Email
  • Current role: Electron-Ion Collider Pre-Operations, Brookhaven National Laboratory
  • Ph.D.: Electrical & Computer Engineering, Michigan State University

I am a Research Associate in Accelerator Physics at Brookhaven National Laboratory, contributing to the Electron-Ion Collider (EIC). My current work focuses on accelerator modeling and beam-dynamics simulations, including wakefields, beam-coupling impedance, collective effects, RF systems, and beam stability for high-performance collider operation.

My doctoral research at Michigan State University focused on electron beam–wave interaction in linear beam devices. I developed analytical and computational models for space-charge effects, gap coupling, annular electron beams, and coupled-cavity traveling-wave tubes, using particle-in-cell and electromagnetic simulation methods.

My broader research goal is to connect accelerator physics, RF engineering, and computational electromagnetics to develop predictive models that improve the understanding, design, and performance of advanced beam and accelerator systems.

Research Interests

Core areas of work

Accelerator Physics & Beam Dynamics

Beam stability, collective effects, longitudinal and transverse dynamics, and collider performance analysis.

Wakefields & Beam-Coupling Impedance

Electromagnetic wakefields, cavity interaction, impedance-driven effects, and numerical modeling.

RF Cavities & Beam–Wave Interaction

RF systems, vacuum electronic devices, gap coupling, space-charge effects, and high-frequency beam–wave interaction.

Computational Modeling

Simulation using ECHO, Elegant, MAD-X, XOOPIC, WarpX, CST, COMSOL, MATLAB, and Python.

Projects

Selected research projects

Beam Dynamics for the Electron-Ion Collider

Brookhaven National Laboratory

Performing accelerator physics studies and beam-dynamics simulations to evaluate beam stability and support reliable EIC pre-operations.

Effect of Space Charge on Electron Beam–Wave Interaction

Michigan State University

Developed analytical models and PIC simulations of linear beam devices to study space-charge effects, gap coupling, and beam dynamics.

Gap Coupling Factor of an Annular Electron Beam

Michigan State University

Built analytical and disk models and carried out PIC/CST studies to analyze annular beam–gap dynamics under large-signal conditions.

Discrete Cavity Analysis of Coupled-Cavity TWTs

Michigan State University

Applied discrete cavity and eigen-analysis methods to coupled-cavity traveling-wave tubes to study gain, beam–circuit interaction, and tunability.

FinFET Fault Modeling

Universiti Teknologi Malaysia

Designed and characterized 15 nm junctionless FinFETs and developed gate-oxide-short fault models using Sentaurus TCAD.

Cleanroom Fabrication & Device Simulation

Class 100 Cleanroom Experience

Worked on device fabrication, thin-film deposition, photolithography, and simulation-based validation of nanoscale device performance.

Publications

Peer-reviewed journal publications

Under Review

Discrete Cavity Analysis of Coupled-Cavity Traveling Wave Tubes

M. W. Rahman, P. Wong, J. Luginsland, M. Franzi, B. Hoff, D. Simon, N. Jordan, R. Gilgenbach, and P. Zhang

IEEE Transactions on Plasma Science

Gap Coupling Factor of an Annular Electron Beam

M. W. Rahman and P. Zhang

Vol. 53, no. 10, pp. 2933–2938, Oct. 2025

AIP Advances

Parametric Analysis of Electron Beam–Wave Interaction in Linear Beam Devices: A Tutorial on Gap Coupling Factor and Scaling to High Frequency

M. W. Rahman and P. Zhang

Vol. 15, no. 3, p. 035128, Mar. 2025

Conference publications

Conference papers and presentations

  • A Discrete Cavity Analysis for Coupled-Cavity Traveling Wave Tubes. M. W. Rahman, P. Wong, J. Luginsland, M. Franzi, B. Hoff, D. Simon, N. Jordan, R. Gilgenbach, and P. Zhang, 2026 IEEE International Conference on Plasma Science (ICOPS), June 22–26, 2026, Lake Tahoe, Nevada, USA.
  • The Effect of Space Charge on the Performance of Linear Beam Devices. M. W. Rahman and P. Zhang, 2024 IEEE Vacuum Electronics Conference (IVEC), April 22–25, 2024, Monterey, California, USA.
  • Space Charge Effects on Beam-Wave Interaction at the Output Gap of Vacuum Electron Tube. M. W. Rahman and P. Zhang, 2023 Gaseous Electronics Conference (GEC), October 9–13, 2023, Ann Arbor, Michigan, USA.
  • Parametric Analysis of Electron Beam-Cavity Interaction. M. W. Rahman and P. Zhang, 2023 IEEE International Conference on Plasma Science (ICOPS), May 21–25, 2023, Santa Fe, New Mexico, USA.
  • Comprehensive Analysis of Gate Oxide Short in Junctionless Fin Field Effect Transistor. M. W. Rahman, N. E. Alias, A. Hamzah, M. P. Tan, and I. Kamisian, 2022 IEEE International Conference on Semiconductor Electronics (ICSE), pp. 73–76, August 2022.

Background

Research and professional experience

Jul 2026 – Present

Research Associate – Accelerator Physics

Brookhaven National Laboratory · Electron-Ion Collider (Pre-Operation)

Contribute to accelerator physics research for the Electron-Ion Collider, perform advanced beam-dynamics simulations, and collaborate with physics, engineering, and controls teams.

Aug 2022 – May 2026

Graduate Research Assistant

Michigan State University · Plasma, Beams, and Interface Science Group

Conducted analytical, PIC, and electromagnetic simulation work on linear beam devices, annular beams, TWTs, and cleanroom-fabricated device structures.

May 2021 – Aug 2021

Research Assistant Intern

Computational Nanoelectronics (CoNE) · Universiti Teknologi Malaysia

Designed and analyzed Multi-Bridge Channel MOSFET (MBCFET) structures in Sentaurus to study defect impacts on performance.

Aug 2020 – Feb 2022

Research Assistant

Universiti Teknologi Malaysia

Studied device-level defects and fault modeling in nanoscale FinFET structures using Sentaurus TCAD.

Academic background

Ph.D., Electrical & Computer Engineering

Michigan State University

Ph.D. Advisor: Peng Zhang

Dissertation: “Electron Beam-Wave Interaction in Linear Beam Devices.”

M.S., Electrical & Computer Engineering

Michigan State University

B.Eng., Electrical & Electronic Engineering

Universiti Teknologi Malaysia

Thesis: “Fault Modelling of Gate-Oxide-Short in 15nm Junctionless FinFET.”