GUILLORY, John guillory@science.gmu.edu
Sr. Contract Professor, School of Computational Sciences
B.A. Physics (Phi Beta Kappa, honors), Rice University 1962
PhD Physics, University of California, Berkeley, 1970
Graduate Courses taught at GMU
Plasma Science I (text: Krall & Trivelpiece, etc.)
Plasma Science II: waves & instabilities (same text)
Intro. to the Space Environment (text: Tascione)
Plasma Boundary Layers (reading course: papers in the field)
Space Sciences Seminar (outside & inside speakers; no text)
Advanced E&M [Physics 722] (text: Jackson)
Approved & prepared but not yet taught:
Mathematics & Computation for Optimal Management of Renewable Resources (text: C. Clark, Bioeconomics)
Research (and Mgmt) Areas
Plasma processing (e.g. in chip mfg)
Electron & ion beam interactions with gases and plasmas
Astrophysical plasma and beam dynamics
Inelastic collision processes and plasma radiation
Interaction of hazardous gas plumes with droplets
Scientific & technical management & optimization
Nonlinear dynamical systems - macroscopic & micro models
Music from before 1650 (Dir., performer, musicologist, Musica Antiqua)
Microeconomic transient models
PROFESSIONAL EXPERIENCE:
PROFESSOR of Space Science & Computational Science, part-time, at the SCHOOL OF COMPUTATIONAL SCIENCES, GEORGE MASON UNIVERSITY. Plasma physics research & teaching, co-leader of Space Science Research Group, organizer of Institute colloquia (9/92-9/93), Faculty Selection Committee (9/92-5/94). Executive Council (1/93-present)
SCIENTIFIC & MANAGEMENT CONSULTANT to NASA HQ, STX Corp., Anatech Ltd., Lindsay Associates, National Bureau of Standards, etc., on a variety of scientific technologies, including plasma and ion beam surface processing, EOS, and space plasma applications (1/75-present).
VICE PRESIDENT AND EAST COAST BRANCH MANAGER, PLASMA RESEARCH CORPORATION. Primary responsibilities included coordination with government agencies and conducting theoretical research for the Air Force and Defense Nuclear Agency on interaction of light with plasma (3/85-12/88).
SENIOR RESEARCH ASSOCIATE, part-time, UNIVERSITY OF MARYLAND
Theoretical plasma physics. Investigations of electron and ion beam propagation (5/78-1/90).
SENIOR PHYSICIST and DEPUTY DIRECTOR, THEORETICAL PHYSICS DIVISION, JAYCOR. Primary responsibilities and research were in the field of plasma and charged particle beam physics. Research work done on propagation of charged-particle beams in the atmosphere; on the physics of electromagnetically-driven plasma x-ray sources; on pulsed-power technology; on technological assessment of progress in high-energy laser systems; and on ion beams and the heavy-ion beam fusion concept (4/78-3/85).
ASSISTANT PROFESSOR of Theoretical Plasma Physics - UNIVERSITY OF MARYLAND. Research on turbulent processes in various plasma regimes, plasma and intense electron beam dynamics, plasma radiative processes, energy transfer from intense electron and ion beams, and production, equilibrium and stability of intense ion pulses from electron beam diodes. Responsibilities also included undergraduate teaching, organizing seminars, and service on the Physics Council, Faculty Committee and Executive & Budget Committee (1/74-4/78).
RESEARCH PHYSICIST, PHYSICS INTERNATIONAL COMPANY.
Research responsibilities in the theoretical analysis of the dynamics of high-current relativisitic electron beams and their interaction with dense plasma and magnetic fields (1970-1973).
NONPROFIT ORGANIZATION ADMINISTRATION:
Founded and directed the nonprofit early music research and performing group, Musica Antiqua; administrative duties, program concepts and preparation, documentation, rehearsal organization, public relations, and staffing (1974-1999).
Consultant to WETA-FM (1980-1994). President, Washington Early Music Society (1979-82). Early Music Coordinator, University of Siena summer session for Music and Art (1980). Guest Lecturer, University of Maryland, Georgetown U., George Mason U., Virginia Museum of Fine Arts, and elsewhere. Board of Directors (1994-95) and 2nd Vice President (1995-97) of Northern Virginia Folk Festival Association. NASA CAN Review Panel (5/95)
COMMUNITY NONPROFIT ORGANIZATION ADMINISTRATION:
Chairman, Bailey's Crossroads Revitalization Corporation Streetscape Committee (11/90-5/94); Director, Bailey's Crossroads Revitalization Corp. (9/93-9/2000), President, 12/94-9/95; Fairfax County Revitalization Advisory Panel (1991). Advisory Panel of Fairfax County Council on the Arts (1986-87); Vocal Music Advisory Panel (1991-94). Steering Committee, Fairfax Spotlight on the Arts (1988-94). Board of Directors, Northern VA Folk Festival Assoc. (6/95 -9/98), 2nd Vice President (9/96 - 9/98).
PUBLICATIONS;
Author on over 40 technical reports, 22 scientific journal articles, 57 professional society presentations, as well as several articles on early music.
(see bibliography)
D. V. Rose, J. U. Guillory, and J. H. Beall, "Comparison of Particle-in-cell Simulation and a Wave-population Model of Electron Beam-Plasma Interactions", subm. to Physics of Plasmas August 9, 2001.
J. Guillory, Interaction of adsorbing/chemisorbing hazardous gas and condensing/evaporating droplets Fifth Annual GMU Transport and Dispersion Modeling Workshop, July 18 & 19, 2001
COMPUTATIONAL PHYSICS Research, 1994-2001:
Limiting current of electron beams: when high-current electron beams are injected into an evacuated, magnetized region along magnetic field lines, analytic theory predicts a limit on the propagated current due to the presence of beam space charge, this limit ing value depending logarithmically on the location of conducting boundaries. Beams are observed to propagate with currents in excess of the predicted limits, however. Our simulation using the fully-relativistic PIC code MAGIC shows how this occurs, and provides improvements on the analytic theory. A paper appears in the Journal of Applied Physics, 11/95.
Distribution of electron energies in a random medium of
energetic "caviton" scatterers: The presence of streams of charged particles streaming through a background plasma induces an instability which, in its nonlinear state, is characterized by localized regions of large-amplitude oscillating electric field, known as cavitons. Interaction of background plasma electrons with an ensemble of caviton scatterers produces an energetic nonthermal "tail" on their energy distribution, which should have important consequences for uv and xray diagnostics of such plasmas. Our ongoing modeling effort includes using postprocessed results from individual electron-caviton scattering events (generated using Mathematica) to provide the parameters for a Monte Carlo scattering code following the statistical scattering of many background electrons on a distribution of evanescent cavitons.
UV observable signatures of nonthermal plasma electron energy distributions in presence of photoionization: We (J. Guillory, J. Beall) have modified the Kallmann XSTAR code to provide the changes in xray and uv line strengths from a mostly photoionized AGN plasma due to a small percentage of energetic "tail" electrons with a hot electron temperature significantly above the bulk electron temperature. (Creation of such tails is anticipated when relativistic streams are present, as discussed above.) These changes may provide a useful diagnostic for the presence of nonthermal electron energy distributions in astrophysical plasmas. Papers published as part of this work are in the Procedings of Vulcano (It.) Conferences, 1994 & 1995, and
"Observational Signatures in Jet-Cloud Interactions." J.Beall, J. Guillory, and D.Rose. Proc 1997 Vulcano (Italy) Workshop. Ed. F. Giovanelli & L. Sabau-Graziati, Ital. Astron. Soc. 1998.
Space- & time-dependent conductivity generation and magnetic screening near fast-rising ion streams in plasma: We (J. Guillory & D. V. Rose) have modeled the generation of increasing background plasma conductivity (and consequent magnetic screening) as an energetic stream of plasma (ions and some co-moving electrons) enters a region of initially uniform plasma. This has applications to both astrophysics and light-ion-beam fusion schemes. A paper was delivered at the American Physical Society's DPP95 meeting in November 1995.
Injection of high-current electron beams across transverse magnetic field, with & without background plasma: With both the 2D MAGIC code and the 3D ARGUS code (run via an NSF grant of time on the Pittsburgh C90) we (D. Rose & J. Guillory) have investigated the energetics, particle leakage, particle reflection, and field structure formed when a stream of energetic electrons in injected into a plasma across ambient magnetic field lines. The work is included in the PhD dissertation of D. Rose.
Pressure effects in plasma-source ion implantation of nitrogen in Ti cathodes: (with Michael Bear) The Berkeley PDP1 code was modified and run to display pressure effects on nitriding of pulsed titanium cathodes. J. Vac. Sci. Technol. A15, Aug.1997.
Multiscale codes for plasma simulation:(with Michael Bear.) A composite code was designed which spanned timescales from tens of ps to minutes and spatial scales from 0.1 micro-meter to tens of cm, using regular sampling of particle-in-cell routines, fluid plasma code, and surface-chemistry routines, with dynamic two-way information exchange among them. Bear & Guillory, "Plasma Etch/Deposition Modeling with a New Dynamically-Coupled Multi-Scale Code and Comparison with Experiment". J. Vac. Sci. Technol. A, 18, 2045 (2000).
Interaction between hazardous gas plumes and water droplets:
Release of hazardous gases is often accompanied by release of heat and particulates, water vapor, etc. Downwind, as the plume temperature equilibrates with the ambient, or as the plume passes through regions of particulates or moisture droplets, there can be interesting effects on the droplet condensation rate and/or the concentration of the hazardous gases under some circumstances due to droplet condensation and adsorption. In this work a simple model was derived and is being coded, for droplet condensation/evaporation in the presence of chemisorbing hazardous gas and for the correction terms to the fluid equations for the gas phase due to the droplet size distribution function .
J. Guillory, "Interaction of adsorbing/chemisorbing hazardous gas and condensing/evaporating droplets" Fifth Annual GMU Transport and Dispersion Modeling Workshop, July 18 & 19, 2001
PhD STUDENTS graduated:
1. David Rose (PhD 1997):
simulation of charged particle beam interaction with plasmas, including a planned light-ion beam fusion driver scheme (MAGIC 2D PIC code, quasi-2D hybrid code, etc.)
D. V. Rose, "Particle-in-Cell Simulations of Intense Charged Particle Beam Transport", GMU PhD Dissertation, 1997.
D. V. Rose & J. Guillory, "Simulation of Limiting Currents for Transport of Intense Relativistic Electron Beams in Conducting Waveguides". Proc. 22nd IEEE Internat. Conf. on Plasma Science, Madison WI, June 5-8, 1995.
D. V. Rose & J. Guillory, "Numerical Simulation of Limiting Currents for Transport of Intense Relativistic Electron Beams in Conducting Waveguides". J. Appl. Phys. 78, 5787, 1 Nov. 1995.
D. V. Rose, J. U. Guillory, and J. H. Beall, "Comparison of Particle-in-cell Simulation and a Wave-population Model of Electron Beam-Plasma Interactions", subm. to Physics of Plasmas August 9, 2001.
2. Michael Bear (PhD 1998):
a process-modeling code including plasmasheath effects on etching and/or deposition on patterned chip surfaces
(industrial plasma processing)
M. J. Bear & J. Guillory, "Plasma Etch/Deposition Modeling: A New Dynamically-Coupled Multi-Scale Code and Comparison with Experiment". J. Vac. Sci. Technol. A, 18, 2045 (2000).
updates as of December 1995:
"Sterilization and Cleaning of Medical Implements by Ion Plasma Etching", Anatech Final Technical Contract Report, July 1992.
"The Potential for Low-Temperature Ion-Assisted Sputter Deposition of SiO2 Layers", Anatech Engineering Applications Report 9207, July 1992.
"The Broad-Line Region of AGN: The Role of Relativistic Jets", with J. Beall and P. Becker. San Francisco AAS Meeting, June 6-10, 1993.
Bull. AAS
"Jets in the Broad-line Region of AGN", with J. Beall.
Proc. Vulcano Workshop on Frontier Objects in Astrophysics & Particle Physics, May 23-28, 1994.
Invited lecture: "The Role of Relativistic Jets in the Broad-Line Region of Active Galaxies", J. Beall & J. Guillory. Pulkhovo Observatory, St. Petersburg, 1 Aug. 1994.
"Beam-Induced Line Emission in the Broad-Line Region of AGN", with J. Beall. Frascati Workshop on Multifrequency Behavior of High-Energy Cosmic Sources, May 22-27, 1995. Memorie della Societa Astronomica Italiana 67, 505 (1996)
"Simulation of Limiting Currents for Transport of Intense Relativistic Electron Beams in Conducting Waveguides", with D. V. Rose. Proc. 22nd IEEE Internat. Conf. on Plasma Science, Madison WI, June 5-8, 1995.
"Operational Window for Light-Ion-Beam Transport for LMF", with D.V. Rose, P.F. Ottinger, B.V. Oliver, D. Mosher, & C.L. Olson.
Proc. 22nd IEEE Internat. Conf. on Plasma Science, Madison WI,
June 5-8, 1995.
"Modeling of Low-Density Ion-Beam-Induced Background Plasmas", with D.V. Rose, P.F. Ottinger, B. Oliver and D. Mosher, [5/3/95] APS Division of Plasma Physics Conf. Nov. 1995.
"Numerical Simulation of Intense Ion Beam Transport in Low-Density Plasmas", with D.V. Rose. APS DPP95 Meeting, Nov. 1995.
"Constraints on Intense Light-Ion Beam Transport for Inertial Fusion", with D.V. Rose, P.F. Ottinger, B.V. Oliver, D. Mosher, & C.L. Olson. APS DPP95 Meeting, Nov. 1995.
"Numerical Simulation of Limiting Currents for Transport of Intense Relativistic Electron Beams in Conducting Waveguides", with D. V. Rose. J. Appl. Phys. 78, 5787, 1 Nov. 1995.