AB Physics, U. C. Berkeley (1971)
PhD Physics, U. C. Berkeley (1979)
PROFESSIONAL EXPERIENCE
1998 - Present, Tensor Technology, Inc., Madison, AL. At Tensor Dr. Orthel has developed a neural network analysis that significantly improves the MDNR probability detection of explosives and reduces false alarms. He has also conducted tradeoff studies involving preliminary shielding design, background noise, and detector efficiency using Monte Carlo simulation techniques.
1994 – 1998, Electrodynamic Research At Electrodynamic Research Dr. Orthel continued to develop the numerical electrodynamic laboratory software, and in connection with this consulted on a magnetron injection gun project. He performed an independent review of the shielding design for a proton therapy facility for the Massachusetts General Hospital / Harvard Medical School Northeast Proton Therapy Facility. Most recently he has utilized the techniques of neutron transport simulation, computerized tomography, and neural net analysis for the development of an innovative airport contraband detection program.
1988 – 1994, G. H. Gillespie Associates, Inc. At G. H. Gillespie Associates, Inc. Dr. Orthel was extensively involved in the scientific and technical evaluation of several major Government programs, most recently he was Program Manager for the Proton Therapy Treatment Facility Shielding and Activation Study contract with Lawrence Berkeley Laboratory. He also authored the NEDlab ™ (Numerical Electrodynamics laboratory) commercial software package - a complete, self-consistent, multispecies particle and 2D electromagnetic field simulation which includes fluid, particle-in-cell, raytrace, Poisson/Boltzmann, and Maxwell equation modules.
1985 – 1988, Boeing Aerospace Company. At Boeing Aerospace Corporation he established a significant computational accelerator modeling capability for the RF linac FEL program which enabled the quick and accurate design, fabrication, testing, and tuning of the 1300 MHz traveling-wave RF buncher and accelerator structures and the 433 MHz standing-wave RF linac cavities. He contributed design support for the RF power systems, including the integration of klystron-waveguide-cavity couplers, circulators, and other components. He also performed shielding design calculations, and the SLAC program EGS (electron gamma shower) to calculate cross talk between collectors in a high intensity e-beam emittance detector, and helped design a rastering beam dump. Additional duties included responsibility for management and coordination of the theory and modeling efforts between the BAC and LANL team members.
1979 – 1985, TRW, Inc. At TRW he worked on a number of problems associated with the production and neutralization of intense negative Deuterium beams for fusion, including the development of a conceptual design for a high power DC accelerator design with multiaperture electrostatic quadrupole structure, and a laser photo-detachment neutralizer cell, both for the DOE STARFIRE study. Also while at TRW he worked on the 500 MHz superconducting RF linear accelerator cavity program, including the calculation and measurement of high-order cavity modes. Other activities involved modeling the TRW Plasma Separation Process (PSP) program ion cyclotron resonant heating (ICRH) and electron cyclotron resonant heating (ECRH) sputter plasma source, ion implantation experiments, and accelerator design for the barium beam diagnostic program for MFE, inertial confinement fusion, and directed energy weapons.
1973
– 1979, Lawrence Berkeley Laboratory.
SELECTED
REPORTS AND PUBLICATIONS
“Final
Report: LBL Proton Therapy Treatment Facility Shielding and Activation Study,”
G. H. Gillespie Associates, Inc. internal report. P.O. Box 2961, Del Mar, California, 92014, 1993.
“NEDlab
Reference Manual, (numerical electrodynamics for the rest of us),” published
by The MACcelerator Project, P.O. Box 2813, Del Mar, California, 92014, 1993.
“Can
the Physical and Numerical Algorithms of Positive Ion Extraction Codes be
applied to Negative Ion Sources?”, invited talk to be given at the Sixth
International Symposium on the Neutralization of Negative Ions and Beams,
Brookhaven National Laboratory, Nov. 9-13, 1992.
“Self-Consistent
Solution of Multispecies Charged Particle Optics Problems Using a Hybrid Fluid/Raytrace/Poisson-Boltzmann
Algorithm”, submitted to the Sixth International Symposium on the
Neutralization of Negative Ions and Beams, Brookhaven National Laboratory, Nov.
9-13, 1992.
“Analysis
of the LBL High Brightness Charge Exchange Negative Ion Source Concept”, GHGA
internal memo No. GHGA-92-320-R.
“Effects
of Surface and Volume Production on Emittance in a Volume- Type Negative Ion
Source” Proceedings of the Fourth Neutral Particle Beam Technical Symposium,
Argonne National Lab, 27 April- 1 May, 1992.
“Analysis
of Two Beam Funnel Emittance Data”, GHGA internal memo No. GHGA-92-306-TM.
“Emittance
Effects of Surface and Volume Produced Negative Ions in the LBL Advanced
Source”, abstract submitted to the LINAC92 conference in Ottawa, Canada.
“A Computer Simulation Program
for Neutron Transmission Contraband Detection Studies”, T. G. Miller, P. J.
Janssen, J. L. Orthel and R. A. Krauss, to be published in the Proceedings
of the Fourteenth International Conference on the Application of Accelerators in
Research and Industry, November 6-9, 1996.
“A Neural Network Computer
Simulation Program for Neutron Transmission Contraband Detection Studies”, T.
G. Miller, P. J. Janssen, J. L. Orthel and R. A. Krauss, to be published in the Proceedings
of The Second Explosives Detection Technology Symposium and Aviation Security
Technology Conference, November 12-15, 1996.
“Contraband Detection Using Neutron Transmission”, T. G. Miller, P. K. Van Staagen, B. C. Gibson, J. L. Orthel and R. A. Krauss, Proceedings of the SPIE, Vol. 2936, pp.102-109, 1997.