Power Electrical
Resume:
Shahid Ahmed, PhD
******.*****@****.***
Dynamic R&D professional with over 10 years of proven experience in
electrical engineering, advancing electromagnetics innovations from
conception through commercialization. Rapid career progression through the
computational modeling and simulations as well as hardware developments.
R&D management with increasing levels of scope and responsibility for
solving complex engineering and multi-physics problems. Emphasize cross-
functional collaborations, tackle complex and challenging tasks with
efficiency while balancing priorities & schedule commitments. Actively
support high performance team environments and customers.
Professional Experience:
Thomas Jefferson National Accelerator Facility, Virginia, USA
2010 - 2014
Staff Scientist, Superconductor Radio Frequency (SRF) Institute (2013-
2014)
Project leader to support and execute innovations in electromagnetics
for accelerator technology. Collaborated with universities/labs and
supervised NSF funded research trainees.
Produced plasma discharges in frequency range (400 MHz - 1500 MHz) in multi-
cell SRF cavities driven by (500 W - 5 kW) Klystron/IOT/power amplifier via
waveguide/capacitive/inductive coupling.
Developed experimental setup for efficient power delivery into plasma using
multi-mode RF power to understand the plasma characteristics/behavior under
multi-frequency power drive mode condition.
Established procedures for optimum plasma suitable for system/device
cleaning/processing through parametric studies by changing the gas
pressure, RF power, multi-frequency power drive, RF matching.
Measured RF tuning, field flatness of multi-cell cavity by perturbation
using a metal bead and VNA.
Performed RF coupling measurements of modes for FPC/FP of cavity using VNA
and antenna.
Performed routine test for cable calibration and bench RF measurements by
utilizing low power RF.
Performed expert advice in trouble-shooting, tooling, assembly,
experimental setup, and diagnostics.
Implemented signal processing and data analysis techniques for analyzing
experimental results.
Published several papers, delivered invited talks, and submitted grant
proposal.
Accelerator Physicist, CASA (2010 - 2013)
Independently handled projects on electromagnetics for applications
in accelerator technology. Collaborated with universities and supervised
NSF funded research trainees.
Designed/optimized 499 MHz, 5 kW RF cavities using 3D CST Microwave Studio
simulations.
Designed/optimized electron beam extraction for 499 MHz (5 kW) RF cavity
systems using full 3D FDTD simulations. Led significant cost/time reduction
for main accelerator upgrade.
Executed experimental plan for 499 MHz/5 kW RF test which includes
procurement, process qualification, industrial clean room integration, UHV
diagnostics/leak test/remedy, and LLRF.
Optimized matching network for maximum RF power delivery from IOT/Klystron
to the cavity.
Performed routine high power (5 kW) RF tests for cavities; evaluated
suitability by phase stability, temperature drift, and frequency shift
analysis. Reduced time/cost, expedited upgrade process.
Designed/optimized 20 kW RF injector through FDTD beam breakup simulations
that improved performance, reduced cost and labor, minimized fabrication
time and expedited upgrade process.
Modeled Inductively/Capacitively Coupled Plasma (ICP/CCP) sources for
compact plasma reactor.
Performed expert advice in trouble-shooting, tooling, assembly,
experimental setup, and diagnostics.
Several scientific papers, design reports and internal technical documents
were published.
Illinois Institute of Technology/ Fermi National Lab, Chicago, USA
2008 - 2010
Senior Research Associate
Senior research member of Center for Accelerator and Particle
Physics. Collaborated with Muons, Inc., authored R&D plans, and co-
supervised Ph.D. students.
Solved complex scientific problem involving electromagnetic interaction of
charged particle's muon beam with plasma developed during ionization
cooling. Results of particle-in-cell simulations showed significant impact
in the cost effective design of a giant machine called muon collider.
Developed and benchmarked code for space charge effect in charge particle
beam.
Designed/optimized solenoidal magnet for capturing charged particle beam
for muon collider.
Experimental investigation of RF induced gas discharges in pressurized
cavity for ionization cooling. Ensured minimum risk of EMI due to high
power RF emission from experimental components used.
Developed full-wave 3D FDTD code for high speed signals in printed traces.
Performed crosstalk/eye-diagram analysis from EM mode perspectives - ideal
for devising mode suppressor to reduce crosstalk.
Published research results and delivered invited talks in international
conferences.
Electronics Communications & Information Technology, Belfast, UK
2004 - 2007
Research Fellow
Member of High Frequency Electronic Circuits group focused on
developing novel generic solutions to advanced problems associated with
wireless front-end technology. Collaborated with TDK electronics.
Optimized power distribution and transformation from transformer to the
main circuit using 3D FDTD.
Developed and optimized full-wave 3D FDTD code for analyzing crosstalk
effect in densely packed high speed interconnects printed on multilayer
substrates.
Optimized a system consisting of transmission lines and circuits driven by
a mixed signal.
Developed/optimized full-wave EM & circuit simulator using 3D FDTD method
for high frequency EM wave interaction with lumped and distributed
components. Benchmarked results with experiments.
Developed, optimized and tested 1D/2D/3D FDTD code for transient EM wave
propagation through dispersive media (plasma) for the study of high speed
digital signals in multilayer complex substrates.
Improved SI by optimizing line topology, substrate thickness and dielectric
properties for TDK Ele.
Parameter extraction/optimization of printed transmission lines by ADS,
benchmarked S-parameters.
Developed full wave 3D FDTD code for the interaction of transient EM waves
with human body in presence of mobile phone. SAR calculated and bio-
electric effect reported.
Wrote qualification test reports and results published.
Institute of High Performance Computing, Singapore 2003 -
2004
Research Fellow
Member of R&D electromagnetic group for advancing EMC/EMI (RFI) in
high frequency radiation environment. Mentored junior team members and
provided solutions to DELPHI electronics.
Optimized power distribution in electrical circuits and electrical motors
for DELPHI electronics.
Designed and optimized shielding enclosure using HFSS for radiation
emission from a high speed digital system for DELPHI electronics. Radiation
emission suppressed by 95%. Correlated/validated simulation results through
experimental measurements.
Used ANSYS for heat transfer and thermal analysis of a fin and a chip for
semiconductor ICs.
Full wave 3D FDTD code developed and optimized for signal integrity in
printed transmission lines.
Developed numerical technique for signal/power integrity improvement in
high speed circuits.
Designed/optimized monopole, dipole, and log-periodic antennas using MoM
method NEC.
Prepared and presented design reviews, and papers published.
Academic Degree:
Ph.D., Institute for Plasma Research, India (2005)
Thesis: Computational Modeling of Electromagnetic Pulse Simulators
Comprehensive studies through extensive developments in electromagnetics
for real life applications in electrical engineering:
Designed/optimized MOM/MIM capacitor using FDTD/MoM for pulsed power
application.
Optimized power transfer from transformer to the pulse forming system for
launching EM pulses.
Developed/optimized fast switches to avoid jitter for coupling high power
fast pulses from Marx generator to the pulse launcher.
Developed frequency domain code for component analysis and benchmarked with
FDTD simulations.
Developed & optimized full-wave 3D FDTD code for EM wave propagation in
complex environments.
Optimized and improved signal/power integrity for EM pulses in EMP
simulators.
Optimized pulse fidelity by matching the characteristic impedance of the
line sections.
Designed and optimized 3D enclosure using FDTD for EMC/EMI (RFI) &
radiation emission/immunity testing of equipment against high voltage
surge, lightening, and ESD.
Implemented FDTD code for the far-field radiation from EMP simulator to
assess leakage.
Designed and optimized HOM suppressor for radiation emission reduction from
EM enclosures.
Developed signal processing for mode extraction & radiation emission
prediction from an enclosure.
Ultra-wideband antenna designed, optimized, characterized, and tested for
pulsed application.
Developed codes for visualization, optimization, inversion & noise
filtration of large data.
Results documented, published, and presented.
Selected Computational Skills:
Numerical Methods & Techniques: Finite-Difference Time-Domain (FDTD),
Finite Element Method (FEM), Finite Integration Method, Frequency Domain
Technique, Method-of-Method (MoM), GTD, UTD, Transmission Line Method
(TLM), Particle-in-Cell (PIC), Monte Carlo, PDE, ODE, RLGC
Code Developments: 1D, 2D, 2.5D, 3D
Simulation Software: Microwave-Studio, COMSOL (multi-physics code), ADS,
MICRO-STRIPES, NEC, Xoopic (PIC RF/Plasma simulation), MAFIA, XFDTD, VECTOR
FIELD, MEEP, HSPICE, PSPICE, CADENCE, VERILOG, KiKad EDA, KiKad PCB Design,
Mentor Graphics.
ANSYS: Heat Transfer, Thermal Analysis, Multiphysics, HFSS, E-Mag, FLOTRAN
CFD
CST Microwave Studio Solvers: Eigen mode, Particle-tracking, PIC, Wake-
field
Numerical Libraries: IMSL, Nag, Numerical Recipes, Antia
Engineering/Scientific Packages: AutoCAD, Matlab, Scilab, Gnuplot, ROOT,
SIMULINK, Mathematica, Mathcad, OCTAVE, Excel, laBVIEW
HPC: Parallel computing using MPI & Open-MP, GPU, Algorithm Development
Operating Systems: DOS, Windows, Linux, Unix, Mac
Languages: Fortran, C, C++, Visual Basic, HTML, Latex
Scripting Languages: BASH, SHELL, PYTHON, PERL, SQL
Statistical Analysis Tools: R, ROOT, MATLAB, OCTAVE
Specialization in Electromagnetics:
Wave Propagation: 3D Free Space, Dielectrics, Complex & Nonlinear Media,
Composite Materials, Multilayer Substrates, Transmission Lines, Waveguides,
Co-axial Cables
Novel EM Structures: Photonic Crystals, Bandgap, Waveguides, Nano-
structures, Surface plasmons, Metamaterials, Cavity
(Normal/Superconducting), Strip Lines, HOM Suppressor
Transient Electromagnetics: LEMP, ESD-EMP, HEMP, Pulsed
Gas Discharge: RF/Microwave induced plasma of gases
Circuits & Systems: Signal/Power Integrity, High Speed, AC/DC,
Analog/Digital/Mixed Signal
Electronics: BJT/FET, MOSFET, CMOS, OPAMP, Device Physics, AM/FM/PM, Noise
Figure, Noise Temperature
Radiating Structures: Pulsed/Plasma/Impulse Radiating/Narrow Band Antennas,
Ka/Ku band
EM Interaction: Electrical/Electronic systems, EMI, EMC, Biological Tissues
EM Analysis: Time/Frequency Domain, Inversion, Optimization, Cross-
Correlation
GeoPhysics: LWD, MWD, LWD Resistivity
Radar: Radar Cross Section, Ground Penetrating Radar, RCS Reduction
Signal Processing: FFT, IFFT, FIR/IIR Filters, Wiener/Kalman Filter, Image
Processing, Data Mining, Array Processing, SVD, Cross-
correlation
Charged Particle Beam: Interaction with EM Wave/Matter/Plasma,
Single/Coupled Bunch Instabilities, Space-Charge/Electron-cloud, Plasma-
Wakefield, Multipacting, Electrodynamics
Selected Instrumentations:
Various experiments based on Active/Passive Circuits, Vector
Network/Spectrum Analyzer, Oscilloscope, TDR, TDT, Signal/Function
Generator, Power Amplifier/IOT/Klystron, Power Meter, Receivers, Filters,
Directional Coupler, Circulator, BERT, RF Tuners, RF Probes, Transformer,
Transmission Line, Waveguide, Harmonic Mixers, PLL, LNA, VCO, Balun, Power
Detector, Power Splitter/Combiner.
Awards/Honors:
2013 IEEE Hampton Roads Outstanding Engineer
Senior member grade of IEEE
Prestigious national scholarship award by the department of atomic energy,
India
First class first (Gold Medalist) in M. Sc.
Referee / Reviewer: US DOE SBIR/STTR; IEEE Ant. & Prop; IEEE EMC; IEEE A&P
Magazine;
JEC Innovations; IRJE S&T Innovations; IJNM; Willey Geophys.
Prospect
Supervisor/Co-supervisor: Undergrad/Master/Ph.D
Proposal/Grant: DOE Early Career Award Proposal (First Phase Accepted)
Book/Chapters: Co-author in the "Design Report for the Future Electron-Ion
Collider" Jefferson Lab, VA
Publications: 45 peer reviewed journal articles and conference proceedings
as a leading author
Professional Society Memberships: IEEE NPSS, ComSoc, APS, MTT
Selected Services: IEEE HR Sec Chair 2014; Member IEEE Education Committee;
Workshop Organizer
Selected Invited /Contributed Talks:
Brookhaven National Laboratory, NY, USA, Feb. 11, 2014
IEEE Hampton Roads Chapter Meeting, Newport News, VA, USA, Oct. 18, 2012
IEEE Hampton Roads Chapter Meeting, Newport News, VA, USA, Oct. 04, 2012
School of Science, Department of Physics, Hampton University, VA, USA, June
2012
IEEE EMC NOVA Chapter Meeting, Rhein Tech. Laboratories, VA, USA, May 2012
International Particle Accelerator Conference, New Orleans, Louisiana, USA,
May 2012
Particle Accelerator Conference, New York, USA, Mar. 2011
Electrical Engineering and Computer Science, W&M university, VA, USA, Apr.
2011
Electrical Engineering and Computer Science, Virginia Tech, USA, Sep. 2010
Meeting on Comp. & Num. Methods for Modeling Breakdown, Tech-X, Boulder,
USA, Mar. 2009
IEEE AP-S International Symposium, Hawaii, USA, June 2007
European Microwave Week, Manchester, UK, Sep. 2006
Loughborough University, Pulsed Power Laboratory, England, UK, June, 2002
University of Manchester, Plasma Physics Laboratory, England, UK, June 2002
Jawaharlal Nehru University, New Delhi, India, Dec. 2001
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