David A. Humphreys

41 papers C 13Journal 13Unranked 15
YearRankTypeTitle / Venue / Authors
2025 J jnl
Time-Varying Signal Propagation at Sub-THz Frequencies Using a Vector Network Analyzer.
IEEE Access
Mohanad Dawood Al-Dabbagh, David Ulm, David A. Humphreys, Thomas Kleine-Ostmann
2023 — conf
A Reference Governor for Plasma-Shape Control in Tokamaks.
CCTA
Andres Pajares, William P. Wehner, Anders S. Welander, Eugenio Schuster, David A. Humphreys
2023 C conf
Implementation and Initial Testing of a Model Predictive Controller for Safety Factor Profile and Energy Regulation in the EAST Tokamak
ACC
Zibo Wang, Hexiang Wang, Eugenio Schuster, Zhengping Luo, Yao Huang, Qiping Yuan, Bingjia Xiao, David A. Humphreys, Sai Tej Paruchuri
2022 — conf
Concepts and challenges in the design of a tokamak plasma control system. ITER PCS for First Plasma and beyond.
CCTA
Luca Zabeo, Peter C. De Vries, Joseph A. Snipes, T. Ravensbergen, Y. Gribov, G. Raupp, W. Treutterer, Alfredo Pironti, Gianmaria De Tommasi, Marcello Cinque, Massimiliano Mattei, David A. Humphreys, M. Walker, Fernanda Rimini, Philippe Moreau, Rémy Nouailletas
2021 — conf
Optimal Shaping of the Safety Factor Profile in the EAST Tokamak.
CCTA
Zibo Wang, Hexiang Wang, Eugenio Schuster, Zhengping Luo, Yao Huang, Qiping Yuan, Bingjia Xiao, David A. Humphreys
2020 — conf
Estimation and exploratory regulation of confinement-time based plasma performance in the DIII-D tokamak experiment.
CCTA
K. Erik J. Olofsson, John R. Ferron, David A. Humphreys, F. Turco, DIII-D Team
2017 — conf
Current profile and energy control in DIII-D plasmas using discrete-time variable-structure control.
MED
Menno Lauret, William Wehner, Eugenio Schuster, Christopher T. Holcomb, Timothy C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Benjamin G. Penaflor, Robert D. Johnson
2017 J jnl
Metrology State-of-the-Art and Challenges in Broadband Phase-Sensitive Terahertz Measurements.
Proc. IEEE
Mira Naftaly, Roland G. Clarke, David A. Humphreys, Nick M. Ridler
2016 C conf
Predictive control of the tokamak q profile to facilitate reproducibility of high-qmin steady-state scenarios at DIII-D.
CCA
William Wehner, Menno Lauret, Eugenio Schuster, John R. Ferron, Chris Holcomb, Tim C. Luce, David A. Humphreys, Michael L. Walker, Ben G. Penaflor, Robert D. Johnson
2015 J jnl
Calibration of Wideband Digital Real-Time Oscilloscopes.
IEEE Trans. Instrum. Meas.
David A. Humphreys, Martin Hudlicka, Irshaad Fatadin
2015 — conf
Current profile control for the development of consistent discharges in DIII-D.
CDC
William Wehner, Justin E. Barton, Mark D. Boyer, Eugenio Schuster, Tim C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2015 J jnl
Principal Component Compression Method for Covariance Matrices Used for Uncertainty Propagation.
IEEE Trans. Instrum. Meas.
David A. Humphreys, Peter M. Harris, Manuel Rodriguez-Higuero, Faisal Ali Mubarak, Dongsheng Zhao, Kari Ojasalo
2014 J jnl
Backstepping Control of the Toroidal Plasma Current Profile in the DIII-D Tokamak.
IEEE Trans. Control. Syst. Technol.
Mark D. Boyer, Justin Barton, Eugenio Schuster, Michael L. Walker, Timothy C. Luce, John R. Ferron, Ben G. Penaflor, Robert D. Johnson, David A. Humphreys
2013 C conf
Identification and control of magneto-kinetic response during advanced tokamak scenarios in DIII-D.
ACC
William Wehner, Wenyu Shi, Eugenio Schuster, Didier Moreau, Michael L. Walker, John R. Ferron, Tim C. Luce, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2013 C conf
PTRANSP simulation and experimental test of a robust current profile and βN controller for off-axis current drive scenarios in the DIII-D tokamak.
ACC
Wenyu Shi, William Wehner, Justin Barton, Mark D. Boyer, Eugenio Schuster, Arnold Kritz, Didier Moreau, Tim C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2013 — conf
Physics-based control-oriented modeling of the safety factor profile dynamics in high performance tokamak plasmas.
CDC
Justin E. Barton, Wenyu Shi, Karim Besseghir, Jo Lister, Arnold Kritz, Eugenio Schuster, Timothy C. Luce, Michael L. Walker, David A. Humphreys, John R. Ferron
2013 J jnl
Traceable Measurement of Source and Receiver EVM Using a Real-Time Oscilloscope.
IEEE Trans. Instrum. Meas.
David A. Humphreys, James Miall
2012 — conf
A two-time-scale model-based combined magnetic and kinetic control system for advanced tokamak scenarios on DIII-D.
CDC
Wenyu Shi, William Wehner, Justin Barton, Mark D. Boyer, Eugenio Schuster, Didier Moreau, Timothy C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2012 C conf
Backstepping control of the plasma current profile in the DIII-D tokamak.
ACC
Mark D. Boyer, Justin Barton, Eugenio Schuster, Tim C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2012 — conf
Current profile tracking for the DIII-D tokamak via LQI optimal control.
CDC
Mark D. Boyer, Justin Barton, Eugenio Schuster, Michael L. Walker, Timothy C. Luce, John R. Ferron, Ben G. Penaflor, Robert D. Johnson, David A. Humphreys
2012 C conf
First-principles model-based robust control of the current profile evolution in the DIII-D tokamak.
ACC
Justin E. Barton, Mark D. Boyer, Wenyu Shi, Eugenio Schuster, Timothy C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2012 C conf
Multivariable robust control of the plasma rotational transform profile for advanced tokamak scenarios in DIII-D.
ACC
Wenyu Shi, William Wehner, Justin Barton, Mark D. Boyer, Eugenio Schuster, Didier Moreau, Tim C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2012 C conf
Optimal feedback control of the poloidal magnetic flux profile in the DIII-D tokamak based on identified plasma response models.
ACC
William Wehner, Wenyu Shi, Eugenio Schuster, Didier Moreau, Michael L. Walker, John R. Ferron, Tim C. Luce, David A. Humphreys, Ben G. Penaflor, Robert D. Johnson
2011 C conf
Data-driven modeling and feedback tracking control of the toroidal rotation profile for advanced tokamak scenarios in DIII-D.
CCA
William Wehner, Chao Xu, Eugenio Schuster, Didier Moreau, Didier Mazon, Michael L. Walker, David A. Humphreys, Yongkyoon In
2011 J jnl
Optimal Tracking Control of Current Profile in Tokamaks.
IEEE Trans. Control. Syst. Technol.
Yongsheng Ou, Chao Xu, Eugenio Schuster, Timothy C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys
2009 J jnl
On feedback stabilization of the tokamak plasma vertical instability.
Autom.
Michael L. Walker, David A. Humphreys
2009 — conf
Optimal tuning of tokamak plasma equilibrium controllers in the presence of time delays.
CCA/ISIC
Eugenio Schuster, David Sondak, Reza Arastoo, Michael L. Walker, David A. Humphreys
2008 C conf
Closed-loop tracking control of poloidal magnetic flux profile in tokamaks.
ACC
Yongsheng Ou, Chao Xu, Eugenio Schuster, Tim C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys
2008 — conf
Extending the RWM stability region by optimal feedback control.
CDC
Joseph N. Dalessio, Eugenio Schuster, David A. Humphreys, Michael L. Walker, Yongkyoon In, Jin-soo Kim
2008 C conf
POD-based optimal control of current profile in tokamak plasmas via nonlinear programming.
ACC
Chao Xu, Joseph N. Dalessio, Yongsheng Ou, Eugenio Schuster, Timothy C. Luce, John R. Ferron, Michael L. Walker, David A. Humphreys
2006 — conf
A Multivariable Analysis of the Plasma Vertical Instability in Tokamaks.
CDC
Michael L. Walker, David A. Humphreys
2006 — conf
Model-based Static and Dynamic Filter Application to Resistive Wall Mode Identification and Feedback Control in DIII-D.
CDC
Yongkyoon In, Jin-soo Kim, David A. Humphreys, Michael L. Walker
2005 J jnl
Plasma vertical stabilization with actuation constraints in the DIII-D tokamak.
Autom.
Eugenio Schuster, Michael L. Walker, David A. Humphreys, Miroslav Krstic
2005 J jnl
Realization of a quantum standard for AC voltage: overview of a European research project.
IEEE Trans. Instrum. Meas.
Oleg A. Chevtchenko, Helko E. van den Brom, Ernest Houtzager, Ralf Behr, Johannes Kohlmann, Jonathan M. Williams, Theodoor J. B. M. Janssen, Luis Palafox, David A. Humphreys, François P. M. Piquemal, Sophie Djordjevic, O. Monnoye, André Poletaeff, Rado Lapuh, Karl-Erik Rydler, Gunnar Eklund
2005 J jnl
Traceable RF peak power measurements for mobile communications.
IEEE Trans. Instrum. Meas.
David A. Humphreys, James Miall
2005 J jnl
Vector calibration of optical reference receivers using a frequency-domain method.
IEEE Trans. Instrum. Meas.
David A. Humphreys, Matthew R. Harper, Andrew J. A. Smith, Ian M. Smith
2004 C conf
Toward the implementation of an anti-windup scheme for vertical and shape control in the DIII-D Tokamak.
ACC
Eugenio Schuster, Michael L. Walker, David A. Humphreys, Miroslav Krstic
2003 — conf
Antiwindup scheme for plasma shape control with rate and magnitude actuation constraints in the DIII-D tokamak.
CDC
Eugenio Schuster, Miroslav Krstic, Michael L. Walker, David A. Humphreys
2003 C conf
Plasma vertical stabilization in the presence of coil voltage saturation in the DIII-D tokamak.
ACC
Eugenio Schuster, Michael L. Walker, David A. Humphreys, Miroslav Krstic
2003 — conf
Some nonlinear controls for nonlinear processes in the DIII-D tokamak.
CDC
Michael L. Walker, David A. Humphreys, Eugenio Schuster
1993 J jnl
An algorithm for the removal of noise and jitter in signals and its application to picosecond electrical measurement.
Numer. Algorithms
Maurice G. Cox, Peter M. Harris, David A. Humphreys