Bulletin of the American Physical Society
2011 Annual Meeting of the Four Corners Section of the APS
Volume 56, Number 11
Friday–Saturday, October 21–22, 2011; Tuscon, Arizona
Session K7: Plasma Physics/Physics Education |
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Chair: Shufang Su, University of Arizona Room: UA Student Union Tubac |
Saturday, October 22, 2011 8:30AM - 8:42AM |
K7.00001: Non-linear Plasma Wave Excitation for Laser Wakefield Acceleration Zafar Yasin High intensity laser pulses can be used to excite the non-linear plasma wakefield for accelerating electrons to relativistic energies. For 1D cold plasma, second order nonlinear differential equation for electrostatic potential can be analytically and numerically solved. Results generated for various laser plasma parameters of interest will be used to describe the plasma wave properties. Current physics issues with excitation and evolution of plasma wave in the 1D underdense plasma will be discussed. [Preview Abstract] |
Saturday, October 22, 2011 8:42AM - 8:54AM |
K7.00002: Modeling Radial Bernstein Modes in an Axisymmetric Finite Length Non-Neutral Plasma Mark Hutchison, Bryan Peterson, Ross Spencer Non-neutral plasmas are often studied in plasma physics because they can be confined for relatively long periods of time when compared to confinement times of neutral plasmas. Primarily, research has been focused on modeling plasmas with textbook geometries such as slabs, infinite cylinders, and spheres. An important aspect of these models is to be able to predict and understand their normal modes. These modes carry vital information about the interior of the plasma and offer a variety of both nondestructive and destructive diagnostics. Unfortunately, traditional methods of trapping and monitoring plasmas can only offer measurements of axial density changes. Therefore, radial Bernstein modes are undetectable in long plasmas. On the other hand, short plasmas will significantly alter their axial density when a radial mode is excited. Modeling these modes in a finite length plasma and done in conjunction with experiment would be valuable in advancing our understanding of these modes and the information they carry. I will be presenting the method we are using to model these modes using a judicious change in variables that numerically works to our advantage. [Preview Abstract] |
Saturday, October 22, 2011 8:54AM - 9:06AM |
K7.00003: Measuring Ion Bernstein Waves in a Non-Neutral, Finite Plasma William Hall, Bryan Peterson The Plasma group at Brigham Young University has created a Malmberg-Penning trap used exclusively to catch non-neutral Ion plasmas. The captured plasmas present an opportunity to study Bernstein modes. These small radially symmetric waves, which oscillate near the Ion Cyclotron frequency, are difficult to detect experimentally, but the finite nature of plasmas in a Malmberg-Penning trap allow us to use end effects of our plasma to measure them. Methods of setup and measurement of these waves, and the current status of the experiment, will be discussed. [Preview Abstract] |
Saturday, October 22, 2011 9:06AM - 9:18AM |
K7.00004: Experimentally validating numerical codes describing non-neutral plasmas Jordan Davis, Grant Hart, Bryan Peterson There are several numerical codes commonly used to describe non-neutral plasmas. These include an equilibrium code, EQUILSOR, and a 2D PIC code, RATTLE. As with all computations, they have assumptions about the relevant physics to include. We are attempting to determine the region of validity of these codes by carefully comparing their output with experimentally measured quantities. We will be measuring the density profile, temperature profile, and Trivelpiece-Gould modes of oscillation, along with the diocotron frequency and compare the spectra produced by the codes to those measured experimentally [Preview Abstract] |
Saturday, October 22, 2011 9:18AM - 9:30AM |
K7.00005: Accurate Scientific Visualization in Research and Physics Teaching Tim Wendler Accurate visualization is key in the expression and comprehension of physical principles. Many 3D animation software packages come with built-in numerical methods for a variety of fundamental classical systems. Scripting languages give access to low-level computational functionality, thereby revealing a virtual physics laboratory for teaching and research. Specific examples will be presented: Galilean relativistic hair, energy conservation in complex systems, scattering from a central force, and energy transfer in bi-molecular reactions. [Preview Abstract] |
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