R.C. Davidson

Princeton Plasma Physics Laboratory

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E.P. Gilson

Princeton Plasma Physics Laboratory

Igor Kaganovich

Princeton Plasma Physics Laboratory

A. Friedman

Lawrence Livermore National Laboratory

J.J. Barnard

Lawrence Livermore National Laboratory

Mikhail Dorf

Lawrence Livermore National Laboratory

D.P. Grote

Lawrence Livermore National Laboratory

E. V. Belova

Princeton Plasma Physics Laboratory

P. C. Efthimion

Princeton University

R. Majeski

Princeton Plasma Physics Laboratory

Edward A. Startsev

Princeton Plasma Physics Laboratory

Cooperative Institutions

Lawrence Berkeley National Laboratory

Lawrence Livermore National Laboratory

Princeton Plasma Physics Laboratory

University of California, Berkeley

Princeton University

Fusion Academy

Lawrence Livermore National Security

University of Washington

Massachusetts Institute of Technology

Los Alamos National Laboratory

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Transverse Beam Compression by Adiabatic Waveform Changes in the Paul Trap Simulator Experiment (PTSX)

Bulletin of the American Physical Society (2006)

E.P. Gilson Moon Jae Chung R.C. Davidson Michael C. Dorf P. C. Efthimion

Trap (plumbing)

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Plasma processes associated with a rapidly moving magnet in the ionosphere

J. D. Sullivan R.C. Davidson J. H. Binsack Tom Chang Barton Lane

Summary Form only given, as follows. Plasma measurements in the vicinity of a large, high-intensity magnet moving rapidly through the ionosphere provide a unique opportunity to study in detail many of the plasma processes (reconnection anomalous diffusion, wave-particle interactions, etc.) that occur naturally throughout the solar system and in other astrophysical contexts, and an opportunity to develop a basic understanding and test theoretical models in new parameter regimes. The large, collisionless, wall-less plasma environment (the ionosphere) makes the investigation of considerable general interest to plasma physics, since several fundamental plasma processes, not otherwise accessible to laboratory experimentation, might be observed and measured quantitatively. Illustrative transport and instability processes have been examined.< >

10.1109/plasma.1989.166050

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Advanced Diagnostic Design for Paul Trap Simulator Experiment (PTSX)

Bulletin of the American Physical Society (2007)

Andrew B. Godbehere M. Chung R.C. Davidson E.P. Gilson

Trap (plumbing)

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WARM DENSE MATTER SCIENCE USING INTENSE ION BEAMS

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2015)

J.J. Barnard R.C. Davidson A. Friedman E.P. Gilson Igor Kaganovich

* This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Security, LLC, Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344, by LBNL under Contract DE-AC02-05CH11231, and by PPPL under Contract DE-AC02-76CH03073. The Heavy Ion Fusion Science Virtual National Laboratory John J. Barnard1, Ronald C. Davidson3, Alex Friedman1, Erik Gilson3, Igor Kaganovich3, Andrew Ng4, David P. Grote1, Qing Ji2, Arun Persaud2, Peter A. Seidl2, Thomas Schenkel2 1. Lawrence Livermore National Laboratory 2. Lawrence Berkeley National Laboratory 3. Princeton Plasma Physics Laboratory 4. Consultant

Warm dense matter

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Detection of Collective Beam Modes in the Paul Trap Simulator Experiment

Bulletin of the American Physical Society (2007)

E.P. Gilson Moon Jae Chung R.C. Davidson Mikhail Dorf P. C. Efthimion

Trap (plumbing)

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Leading-Order Nonlinear Effects on Single-Particle Orbits in Periodic Focusing Solenoidal Fields

Bulletin of the American Physical Society (2010)

M. Alpert R.C. Davidson

Particle (ecology)

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Numerical Study of Field-reversed Configurations: The Formation and Ion Spin-up

E. V. Belova R.C. Davidson Hantao Ji M. Yamada C. D. Cothran

Results of three-dimensional numerical simulations of field-reversed configurations (FRCs) are presented. Emphasis of this work is on the nonlinear evolution of magnetohydrodynamic (MHD) instabilities in kinetic FRCs, and the new FRC formation method by counter-helicity spheromak merging. Kinetic simulations show nonlinear saturation of the n = 1 tilt mode, where n is the toroidal mode number. The n = 2 and n = 3 rotational modes are observed to grow during the nonlinear phase of the tilt instability due to the ion spin-up in the toroidal direction. The ion toroidal spin-up is shown to be related to the resistive decay of the internal flux, and the resulting loss of particle confinement. Three-dimensional MHD simulations of counter-helicity spheromak merging and FRC formation show good qualitative agreement with results from the SSX-FRC experiment. The simulations show formation of an FRC in about 20-30 Alfven times for typical experimental parameters. The growth rate of the n = 1 tilt mode is shown to be significantly reduced compared to the MHD growth rate due to the large plasma viscosity and field-line-tying effects.

Helicity

Spheromak

10.2172/840784

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Effects of Injection and Confinement Imperfections on Plasma Stability in the Paul Trap Simulator Experiment

Bulletin of the American Physical Society (2008)

Nicholas E. Thomas М. Chung R.C. Davidson Mikhail Dorf P. C. Efthimion

Trap (plumbing)

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Developing The Physics Desing for NDCS-II, A Unique Pulse-Compressing Ion Accelerator

A. Friedman J.J. Barnard Ron Cohen D.P. Grote S.M. Lund

The Heavy Ion Fusion Science Virtual National Laboratory (a collaboration of LBNL, LLNL, and PPPL) is using intense ion beams to heat thin foils to the 'warm dense matter' regime at {approx}< 1 eV, and is developing capabilities for studying target physics relevant to ion-driven inertial fusion energy. The need for rapid target heating led to the development of plasma-neutralized pulse compression, with current amplification factors exceeding 50 now routine on the Neutralized Drift Compression Experiment (NDCX). Construction of an improved platform, NDCX-II, has begun at LBNL with planned completion in 2012. Using refurbished induction cells from the Advanced Test Accelerator at LLNL, NDCX-II will compress a {approx}500 ns pulse of Li{sup +} ions to {approx} 1 ns while accelerating it to 3-4 MeV over {approx} 15 m. Strong space charge forces are incorporated into the machine design at a fundamental level. We are using analysis, an interactive 1D PIC code (ASP) with optimizing capabilities and centroid tracking, and multi-dimensional Warpcode PIC simulations, to develop the NDCX-II accelerator. This paper describes the computational models employed, and the resulting physics design for the accelerator.

Warm dense matter

Fusion power

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Numerical Study of the Formation, Ion Spin-up and Nonlinear Stability Properties of Field-reversed Configurations

E. V. Belova R.C. Davidson Hantao Ji M. Yamada C. D. Cothran

Results of three-dimensional numerical simulations of field-reversed configurations (FRCs) are presented. Emphasis of this work is on the nonlinear evolution of magnetohydrodynamic (MHD) instabilities in kinetic FRCs and the new FRC formation method by the counter-helicity spheromak merging. Kinetic simulations show nonlinear saturation of the n = 1 tilt mode, where n is the toroidal mode number. The n = 2 and n = 3 rotational modes are observed to grow during the nonlinear phase of the tilt instability due to the ion spin-up in the toroidal direction. The ion toroidal spin-up is shown to be related to the resistive decay of the internal flux, and the resulting loss of particle confinement. Three-dimensional MHD simulations of counter-helicity spheromak merging and FRC formation show good agreement with results from the SSX-FRC experiment. Simulations show formation of an FRC in about 30 Alfven times for typical experimental parameters. The growth rate of the n = 1 tilt mode is shown to be significantly reduced compared to the MHD growth rate due to the large plasma viscosity and field-line-tying effects.

Helicity

Spheromak

10.2172/836157

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