Dr. Stanley Humphries, Jr.
Chief Consultant

Stan Humphries spent the first half of his career as an experimentalist in the fields of plasma physics, controlled fusion and charged particle acceleration. A notable contribution was the creation and demonstration of methods to generate and to transport intense ion beams. This work culminated in the construction of multistage ion accelerators with beam current exceeding 10 kA. His current work centers on computer simulations of electromagnetic fields, biomedical processes and radiation transport in materials. He ran his first computer program in 1963 and has remained at the forefront of technical programing and applications for personal computers. Dr. Humphries is the author of over 150 journal publications and the textbooks Principles of Charged-particle Acceleration (John Wiley, New York, 1986), Charged Particle Beams (John Wiley, New York, 1990) and Field Solutions on Computers (CRC Press, Boca Raton, 1997). He received a B.S. in Physics from the Massachusetts Institute of Technology and a Ph.D. in Nuclear Engineering from the University of California at Berkeley. He was elected a Fellow of the American Physical Society and the Institute of Electrical and Electronic Engineers. Dr. Humphries recently retired from the University of New Mexico after twenty years as a Professor of Electrical and Computer Engineering.

Recent consulting

Accuray Incorporated, Davis Instruments Corporation, DSO National Laboratories (Singapore), IAE SpA (Italy), Ionatron Incoporated, Lawrence Livermore National Laboratory, Lawrence Berkeley National Laboratory, Los Alamos National Laboratory, Marresearch GmbH (Germany), Science Applications International Corporation, Sandia National Laboratories, Spectra-Mat Incorporated, Still River Systems, Valleylab/Tyco Heathcare.

Recent publications (Link to full publication list}

1. Computer modeling of the effect of perfusion on heating patterns in radiofrequency tumor ablation, Intl. J. of Hyperthermia 23, 49 (2007), (with Z. Liu, M. Ahmed. A. Sabir and S. Goldberg)
2. RF tumour ablation: Computer simulation and mathematical modelling of the effects of electrical and thermal conductivity, Intl. J. of Hyperthermia 21, 199 (2005), (with S. Lobo, Z. Liu, N. Yu, M. Ahmed, E. Cosman, R. Lenkinski, W. Goldberg and S. Goldberg).
3. Grid-focused diodes for radiography, Proc. 2005 Pulsed Power Conference (IEEE, Piscataway, N.J., 2005), (with C. Ekdahl).
4. First observation of elliptical sheet beam formation with an asymmetric solenoid lens, Phys. Rev. Accel. Beams 8, 080401 (2005), (with S. Russell, Z. Wang, W. Haynes, R. Wheat, B. Carlsten, L.M.Earley and P. Ferguson).
5. Radiofrequency tumor ablation: insight into improved efficacy using computer modeling, Am. J. Roentgenol 184, 1347 (2005), with Z. Liu, S. M. Lobo, C. Horkan, S. A. Solazzo, A. U. Hines-Peralta, R. E. Lenkinski and S. N. Goldberg)
6. Stable two-plane focusing for emittance-dominated sheet-beam transport, Phys. Rev. Accel. Beams 8, 062002 (2005), with (B. Carlsten, L. Earley, F. Krawczyk, S. J. Russell, J. Potter and P. Ferguson).
7. Stability of an emittance-dominated sheet-electron beam in planar wiggler and periodic permanent magnet structures with natural focusing, Phys. Rev. Accel. Beams 8, 062001 (2005), with (B. Carlsten, L. Earley, F. Krawczyk, S. J. Russell, J. Potter and P. Ferguson).
8. Three-dimensional finite-element code for electrosurgery and thermal ablation simulations”, Progress in Biomedical Optics and Imaging 6, 181 (2005), (with K. Johnson, K. Rick, Z. Liu and S. Goldberg).
9. Intense electron-beam results from the DAHRT-II linear induction accelerator, IEEE Trans. Plasma Sci. 33, 892 (2005), (with C. Ekdahl, et.al.)
10. Focusing of high-perveance planar electron beams in a miniature wiggler array, IEEE Trans. Plasma Sci. 33, 882 (2005), (with S. Russell, B. Carlsten and L. Earley).
11. Technology Development for a MM-Wave Sheet-Beam Traveling-Wave Tube, IEEE Trans. Plasma Sci.. 33, 85 (2005), (with B. Carlsten, S. Russell, L. Earley, F. Krawczyk, J. Potter and P. Ferguson.).
12. Modeling ion extraction from a free plasma surface with a flexible conformal mesh, J. Comp. Phys. 204, 587 (2005).
13. Optimizing the performance of flat-surface, high-gradient insulators, IEEE Trans. Dielectrics and Electrical Insulation 12, 530 (2005), (with J. Leopold, U. Dai, Y. Finkeltstein and E. Weissman).
14. Circular-to-planar transformations of high-perveance electron by asymmetric solenoid lenses, Phys. Rev. Accel. and Beams 7, 060401 (2004), (with S. Russell, B. Carlsten, L. Earley and P. Ferguson).
15. Scattering simulations.in inhomogeneous volumes for scanning near-field optical microscopy, J. Modern Optics 47, 805 (2000).
16. Simulation tooks for high-intensity radiographic diodes, Proc. 2003 Particle Accelerator Conf. (IEEE, Catalog 03CH37423C, Piscataway, NJ, 2003), 3557 (with T. Orzechowski and J. McCarrick).
17. Self-magnetic field calculations in ray-tracing codes, Laser and Particle Beams 18, 601 (2000).