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David A. Hammer

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  • David A. Hammer
  • Dept: Electrical and Computer Engineering
  • Title: J. Carlton Ward, Jr, Professor of Nuclear Energy Engineering
  • Address: Room 327 Frank H T Rhodes Hall
  • Phone: 607 255-3916
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Biography

Dr. Hammer is the J. Carlton Ward Professor of Nuclear Energy Engineering and Professor of Electrical and Computer Engineering. He has been a Cornell faculty member since 1977. Hammer worked at the Naval Research Laboratory in 1969-1976, was a Visiting Associate Professor (part time) at the University of Maryland in 1973-1976, and was an Associate Professor at UCLA in 1977. He spent sabbatical leaves from Cornell in 1983-84, 1991 and 2004 as a Visiting Senior Fellow at Imperial College, London, in 1998 at Applied Materials, Inc., and in 2011 at the Paris Observatory, France.

Research Interests

High energy density plasmas: we study the dynamics of the hot, dense plasmas procuced when fine wires are exploded by short high current pulses. Experiments carried out with single wires are investigating the physical processes of the wires during the explosion process. Experiments with 2 or more wires that cross and touch in the middle, in the form of an X, are used to generate very high energy density plasmas and high intensity x-ray point sources. Experiments with multiple wire arrays are intended to study the dynamics of the plasmas that form around the wires as they interact with each other, as well as the high energy density plasmas that form when the individual wire plasmas merge on the array axis. Many of these experiments address questions related to inertial confinement fusion.

Plasma measurements by optical techniques: we use the techniques of visible light and x-ray spectroscopy, laser-based diagnostic methods and advanced electro-optical instruments to study the properties of dense plasmas without perturbing them; we develop new diagnostic techniques for dense plasmas using these methods.

X-rays from X-pinches for radiography: We use the tiny plasma source generated by the X pinch (see High energy density plasmas) to study the properties of near-solid-density plasmas at 10,000,000 K and we are developing this source for possible application to biomedical radiography.

 

Teaching Interests

Plasma Physics and controlled fusion, Energy Seminar; electromagnetics.

Selected Publications

  • Gourdain, P. A., I. C. Blesener, J. B. Greenly, David A. Hammer, P. F. Knapp, B. R. Kusse, P. C. Schrafel. 2010. "Initial experiments using radial foils on the COBRA pulsed power generator." Phys. Plasmas 17: 012706.
  • Knapp, P. F., J. B. Greenly, P. A. Gourdain, C. L. Hoyt, M. R. Martin, S. A. Pikuz, C. E. Seyler, T. A. Shelkovenko, David A. Hammer. 2010. "Growth and saturation of the axial Instability in low wire number wire array z-pinches." Phys. Plasmas 17: 012704.
  • Shelkovenko, T. A., S. A. Pikuz, A. D. Cahill, P. F. Knapp, David A. Hammer, D. B. Sinars, I. N. Tilikin, S. N. Mishin. 2010. "Hybrid X-pinch with conical electrodes." Physics of Plasmas 17 (11): 112707-112712.
  • Blesener, I. C., J. B. Greenly, S. A. Pikuz, T. A. Shelkovenko, S. Vishniakou, David A. Hammer, B. R. Kusse. 2009. "Axial x-ray backlighting of wire-array Z-pinches using X pinches." Review of Scientific Instruments 80 (12): 123505.
  • Douglass, J. D., S. A. Pikuz, T. A. Shelkovenko, David A. Hammer, S. N. Bland, S. C. Bott. 2007. "Structure of the dense cores and ablation plasmas in the initiation phase of tungsten wire-array Z pinches." Phys. Plasmas 14: 012704.

Selected Awards and Honors

  • Cornell College of Engineering Teaching Award (Cornell University) 2006
  • Cornell IEEE Professor of the Year Award 2006
  • McCormack Award for Excellence 2005
  • IEEE Plasma Science and Applications Committee Award 2004
  • Cornell College of Engineering Teaching Award (Cornell University) 1998

Education

  • BS (Physics), California Institute of Technology, 1964
  • Ph D (Applied Physics), Cornell University, 1969