Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session M3: Plasma Astrophysics |
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Sponsoring Units: GPAP Room: Marriott Tampa Waterside Grand Salon A/B |
Sunday, April 17, 2005 3:15PM - 3:51PM |
M3.00001: Particle Acceleration via Colliding Electromagnetic Pulses Invited Speaker: Using multi-dimensional PIC simulations, we demonstrate a new mechanism for the sustained in-phase acceleration of electron-positron and low-density electron-ion plasmas using two ultra-intense (UL) laser pulses irradiating a thin plasma slab from both sides. At late times the accelerated particle phase distribution strongly resembles that of the Diamagnetic Relativistic Pulse Accelerator (DRPA), which in turn shows remarkable similarity to cosmic gamma-ray bursts in their light curves, spectra and spectral evolution. We will discuss specific laboratory experiments to demonstrate this new phenomenon using ULs currently under construction. Scaling issues and astrophysics applications will be highlighted. [Preview Abstract] |
Sunday, April 17, 2005 3:51PM - 4:27PM |
M3.00002: A PlasmPhysicist View at Gamma-Ray Burst Shocks Invited Speaker: Gamma-Ray Bursts (GRBs) are the most violent and energetic phenomena in the Universe. The generally accepted model of GRBs assumes that the observed radiation is produced in highly relativistic collisionless shocks (internal and external). Yet it does not explain {\it why} and {\it how} this radiation is produced, as well as it provides no clue on the structure of the shock itself. In the talk I will will give some background and will discuss recent developments in the self-consistent theory of GRB shocks in an unmagnetized medium. I'll demonstrate that the theory naturally explains some GRB puzzing features. [Preview Abstract] |
Sunday, April 17, 2005 4:27PM - 5:03PM |
M3.00003: Hydrodynamics and Radiative Hydrodynamics with Astrophysical Applications Invited Speaker: The high-energy-density research facilities of today can accelerate small but macroscopic amounts of material to velocities above 100 km/s, can heat such material to temperatures above 100 eV, and can produce pressures far above a million atmospheres (10$^{12}$ dynes/cm$^{2}$ or 0.1 TPascal). Many of these facilities were built to pursue inertial confinement fusion. Their emergence as versatile experimental tools has created new opportunities in basic research with astrophysical applications. In the areas of hydrodynamics and radiation hydrodynamics, one can produce dynamic processes such as instabilities that occur in astrophysical systems but cannot be directly observed. One can do this in experimental systems that are well scaled to their astrophysical counterparts, either completely or in terms of relevant dimensionless parameters. This talk will provide examples from current research in the areas of hydrodynamic instabilities at interfaces shocked by blast waves and from radiatively collapsing jets and shocks. Hydrodynamic experiments have produced blast waves that shock and then decelerate unstable interfaces to produce high-velocity spikes of dense material at very high Reynolds number. Radiation-hydrodynamic experiments have produced jets that collapse radially and shocks that collapse axially through radiation losses. The results of such experiments and the issues that arise in connecting them to astrophysics will be discussed. [Preview Abstract] |
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