Lawrence Livermore National Laboratory

Ronald Cohen

Associate Program Leaader
Physics Division

 +1 925-422-9831

Ph.D. Physics
B.S. Physics

Research Experience

  • Research Associate, Princeton University Plasma Physics Lab, 1973-1974
  • Physicist, Fusion Energy Sciences Program, LLNL, 1974-present
  • Associate Program Leader and MFE Theory Group Leader, LLNL, 1988-2006

Ronald Cohen is a theoretical and computational plasma physicist with general interests in plasma physics for magnetic fusion and heavy-ion fusion applications, accelerator physics, nonlinear dynamics, computational fluid dynamics, astrophysics, and space plasmas. Specific MFE plasma physics areas of concentration have included tokamak edge physics radio frequency-plasma interactions, magnetic mirror confinement, and spheromak physics. He ws co-PI of the team that won the Gordon Bell Prize for computational performance in 1999. He is a fellow of the American Physical Society, and has over 160 refereed publications.

Selected Publications

I. Joseph, R.H. Cohen, and D.D. Ryutov, "Driving toroidally asymmetric current through the tokamak scrape-off layer to suppress edge localized modes", Phys. Plasmas 16, 052510 (2009).

R.H. Cohen, D.P. Grote, A. Friedman, and J.-L. Vay, "An Implicit ``Drift-Lorentz'' Mover for Plasma and Beam Simulations", Nucl. Inst. and Methods in Physics Research A 606, 53 (2009).

R.H. Cohen and X.Q. Xu, "Progress in Kinetic Simulation of Edge Plasmas", Contributions to Plasma Physics 48, 212 (July 2008) (invited review).

R.H. Cohen, B. LaBombard, D.D. Ryutov, J.L. Terry, M.V. Umansky, X.Q. Xu, S. Zweben, "Theory and Fluid Simulations of Boundary Plasma Fluctuations", Nucl. Fusion 47, 612 (2007).

R.H. Cohen, D.D. Ryutov, G.F. Counsell, and P. Helander, "Current and Potential Distribution with Toroidally Asymmetric Biasing of the Divertor Plate", Plasma Phys. Controlled Fusion 49, 1 (2007).

R.H. Cohen and D.D. Ryutov, "Dynamics of an isolated blob in the presence of the X-point", Contrib. to Plasma Physics 46, 678 (2006).

R.H. Cohen and D.D. Ryutov, "On the possibility of the sheath-driven, finite-beta modes localized near the divertor plate", Plasma Phys. Control. Fusion 47, 1187 (2005).

R.H. Cohen, A. Friedman, M. Kireeff Covo, S.M. Lund, A.W. Molvik, F.M. Bieniosek, F. P.A. Seidl, J.-L. Vay, P. Stoltz, and S. Veitzer, "Simulating Electron Clouds in Heavy-Ion Accelerators," Phys. Plasmas 12, 056708 (2005).

R.H Cohen and D.D Ryutov, "Sheath Physics and Boundary Conditions for Edge Plasmas", Contrib. Plasma Phys. 44, 111 (2004) (invited review paper).

Shestakov, A. I., Cohen, R. H., Crotinger, J. A., LoDestro, L. L., Tarditi, A. and Xu, X. Q., "Self-Consistent Modeling of Turbulence and Transport," J. Comp. Physics, 185, 399-426 (2003).

Cohen, R. H., Dannevik, W. P., Dimits, A. M., Eliason,D., Mirin, A. A., Zhou, Y., Porter, D. H. and Woodward, P. R., "Three-dimensional simulation of a Richtmyer-Meshkov instability with a two-scale initial perturbation." Physics of Fluids 14, 3692 (2002).

Cohen, R.H., Ryutov, D.D., "Discrete symmetries in axisymmetric toroidal plasma confinement," Phys. Plasmas 8, 1451 (2001).

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