TITLE

Simulations of electron transport and ignition for direct-drive fast-ignition targets

AUTHOR(S)
Solodov, A. A.; Anderson, K. S.; Betti, R.; Gotcheva, V.; Myatt, J.; Delettrez, J. A.; Skupsky, S.; Theobald, W.; Stoeckl, C.
PUB. DATE
November 2008
SOURCE
Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p112702
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The performance of high-gain, fast-ignition fusion targets is investigated using one-dimensional hydrodynamic simulations of implosion and two-dimensional (2D) hybrid fluid-particle simulations of hot-electron transport, ignition, and burn. The 2D/3D hybrid-particle-in-cell code LSP [D. R. Welch et al., Nucl. Instrum. Methods Phys. Res. A 464, 134 (2001)] and the 2D fluid code DRACO [P. B. Radha et al., Phys. Plasmas 12, 056307 (2005)] are integrated to simulate the hot-electron transport and heating for direct-drive fast-ignition targets. LSP simulates the transport of hot electrons from the place where they are generated to the dense fuel core where their energy is absorbed. DRACO includes the physics required to simulate compression, ignition, and burn of fast-ignition targets. The self-generated resistive magnetic field is found to collimate the hot-electron beam, increase the coupling efficiency of hot electrons with the target, and reduce the minimum energy required for ignition. Resistive filamentation of the hot-electron beam is also observed. The minimum energy required for ignition is found for hot electrons with realistic angular spread and Maxwellian energy-distribution function.
ACCESSION #
35541244

 

Related Articles

  • Energisation of O+ and O+2 Ions at Mars: An Analysis of a 3-D Quasi-Neutral Hybrid Model Simulation. Kallio, E.; Fedorov, A.; Barabash, S.; Janhunen, P.; Koskinen, H.; Schmidt, W.; Lundin, R.; Gunell, H.; Holmström, M.; Futaana, Y.; Yamauchi, M.; Grigoriev, A.; Winningham, J.; Frahm, R.; Sharber, J. // Space Science Reviews;Jul2006, Vol. 126 Issue 1-4, p39 

    We have studied the loss of O+ and O+2 ions at Mars with a numerical model. In our quasi-neutral hybrid model ions (H+, He++, O+, O+2) are treated as particles while electrons form a massless charge-neutralising fluid. The employed model version does not include the Martian magnetic field...

  • Production of net positive space charge in a rarefied neutral gas for strong focusing of electron beams. Kuperman, V. Yu.; Friedman, G. // Journal of Applied Physics;11/1/1992, Vol. 72 Issue 9, p3867 

    Presents a study that examined a stationary process of secondary particle production due to impact ionization of neutral gas by an electron beam and their escape in the presence of an axial focusing magnetic field. Dynamic processes leading to the over-compensation of the beam; Steady state of...

  • Net current generation and beam transport efficiency of grad-B-drift transported relativistic electron beams. Rose, D. V.; Welch, D. R.; Ottinger, P. F.; Schumer, J. W. // Physics of Plasmas;Nov2001, Vol. 8 Issue 11, p4972 

    Numerical simulations of grad-B drifting, high-current, relativistic electron beams are presented. The simulations use a hybrid fluid/particle-in-cell code to study the net-current and conductivity evolution for 200 to 900 kA, 1.3 MeV annular electron beams in a background gas of nitrogen (N[sub...

  • Modulating the Distribution of the Radiation Dose in Biological Objects Irradiated by an Electron Beam. Alexeeva, L. V.; Andreev, A. A.; Varzar, S. M.; Plotnikov, A. B.; Tultaev, A. V.; Chernyaev, A. P. // Instruments & Experimental Techniques;May/Jun2003, Vol. 46 Issue 3, p395 

    A technique for obtaining a uniform distribution of the radiation dose in a target is described. The specific feature of this technique is the use of the movement of electrons in the transverse magnetic field. The GEANT computer program has been used in a computer simulation of the experiment...

  • What Helicity Can Tell Us about Solar Magnetic Fields. Pevtsov, Alexei A. // Journal of Astrophysics & Astronomy;Mar/Jun2008, Vol. 29 Issue 1/2, p49 

    Concept of magnetic/current helicity was introduced to solar physics about 15 years ago. Earlier studies led to discovery of such fundamental properties as hemispheric helicity rule, and role of helicity in magnetic reconnection and solar eruptions. Later, the concept was successfully applied in...

  • Linear theory for fast collisionless magnetic reconnection in the lower-hybrid frequency range. Jovanovic, D.; Shukla, P. K. // Physics of Plasmas;May2005, Vol. 12 Issue 5, p052114 

    A linear theory is presented for the interplay between the fast collisionless magnetic reconnection and the lower-hybrid waves that has been observed in recent computer simulations [J. F. Drake, M. Swisdak, C. Cattell et al., Science 299, 873 (2003)]. In plasma configurations with a strong guide...

  • One-dimensional particle-in-cell simulation of a current-free double layer in an expanding plasma. Meige, Albert; Boswell, Rod W.; Charles, Christine; Turner, Miles M. // Physics of Plasmas;May2005, Vol. 12 Issue 5, p052317 

    A one-dimensional particle-in-cell code using Monte Carlo collision techniques (MCC/PIC) for both ions and electrons is used to simulate our earlier experimental results which showed that a current-free electric double layer (DL) can form in a plasma expanding along a diverging magnetic field....

  • Plume detachment from a magnetic nozzle. Deline, Christopher A.; Bengtson, Roger D.; Breizman, Boris N.; Tushentsov, Mikhail R.; Jones, Jonathan E.; Chavers, D. Greg; Dobson, Chris C.; Schuettpelz, Branwen M. // Physics of Plasmas;Mar2009, Vol. 16 Issue 3, p033502 

    High-powered electric propulsion thrusters utilizing a magnetized plasma require that plasma exhaust detach from the applied magnetic field in order to produce thrust. This paper presents experimental results demonstrating that a sufficiently energetic and flowing plasma can indeed detach from a...

  • Electron spin relaxation due to reorientation of a permanent zero field splitting tensor. Schaefle, Nathaniel; Sharp, Robert // Journal of Chemical Physics;9/15/2004, Vol. 121 Issue 11, p5387 

    Electron spin relaxation of transition metal ions with spin S>=1 results primarily from thermal modulation of the zero field splitting (zfs) tensor. This occurs both by distortion of the zfs tensor due to intermolecular collisions and, for complexes with less than cubic symmetry, by...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics