Bulletin of the American Physical Society
2017 Annual Spring Meeting of the APS Ohio-Region Section
Volume 62, Number 6
Friday–Saturday, May 5–6, 2017; Ypsilanti, Michigan
Session B4: Contributed Posters: Atomic, Molecular, Optical, Plasma, Particle, and Nuclear Physics |
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Chair: Eric Paradis, Eastern Michigan University Room: Pray-Harrold 218 |
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B4.00001: Orbiting Dust Particles in a Potential Sheath Kathleen Hill, Robert Rau, William Theisen A variable aperture with a center post placed in a strongly-coupled complex plasma will generate a ring shaped potential. A dusty plasma ring is formed inside the confining potential well. A single dust particle that orbits around the ring is occasionally observed during the initial setup. Various parameters for the orbiting particle including the velocity, period, and mass can be calculated. Drag forces acting on the orbiting particle are discussed. A driving force allowing the particle to continuously orbit in the potential well is postulated. [Preview Abstract] |
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B4.00002: Optical Temperature Stabilization System for RF Electric Field Probes Manika Ross, Dr. Eric Paradis, Dr. Georg Raithel, Dr. David Anderson We report on an optical temperature stabilization system of a rubidium vapor cell, to be used in radio frequency (RF) field sensing experiments. Rydberg atoms are highly sensitive to external electric fields, but the intensity of an absorption signal from these atoms will vary with temperature. This research will be used to separate detected signal variations due to applied electric fields from temperature fluctuations. Several designs were developed to provide both passive and active temperature control. [Preview Abstract] |
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B4.00003: Simulating Light Propagation and Modeling the JSNS$^{\mathrm{2}}$ Detector William Warner The J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source (JSNS$^{\mathrm{2}})$ aims to prove the existence or non-existence of light sterile neutrinos. JSNS$^{\mathrm{2}}$ will look for muon-antineutrino to electron-antineutrino$_{\mathrm{\thinspace }}$oscillations over a 24 m baseline using the Rapid Cycling Synchrotron (RCS) at the Material and Life Science Experimental Facility (MLF) in Tokai, Japan. The detector will be composed of two cylindrical tanks each filled with 25 tons of Gd-doped liquid scintillator with a height and diameter of 3.4 meters. The RAT analysis tool is used to model the detector and simulate light propagation within. Pulse shape discrimination methods are used to distinguish between positrons and neutrons to correctly identify electron-antineutrino-induced inverse beta decay events amongst cosmic background. This talk will introduce the JSNS$^{\mathrm{2}}$ experiment and design, with a focus on simulating various event classes in the detector. [Preview Abstract] |
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B4.00004: Magnetized Hot White Dwarfs Jeff Peterson In this work, we study the effects of temperature and strong magnetic fields for matter inside white dwarfs. We model the star interior as a relativistic free Fermi gas of electrons in weak equilibrium with Carbon nuclei and include the anomalous magnetic moment for the electrons. We find that, at low densities (in the outer regions of the star), both temperature and magnetic field effects play a role. Finally, we study consequences of fixing the entropy per particle instead of the temperature within the star. [Preview Abstract] |
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B4.00005: Using R-function to study the high-resolution spectrometer HRS acceptance for the 12 GeV era experiment E12-06-114 at JLab Gulakhshan Hamad The aim of this study is to module the High-Resolution Spectrometer (HRS) acceptance in an accelerator based study of the internal structure of the proton to the 1{\%} level. The HRS acceptance is a 4-D region of space, depending on the four correlated target variables (ytg, $\theta $tg, $\varphi $tg, $\delta $tg). Making the 4-D acceptance region impossible to visualize. The R-function provides a convenient way to make a single cut and select electrons in the 4D-space. Preliminary results show that the R-value spectrum from experimental data agrees with R-value spectrum from the simulation. In future, we will optimize the simulation for better agreement with the experiment. [Preview Abstract] |
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B4.00006: Variational Principles and Applications of Local Topological Constants of Motion for Non-Barotropic Magnetohydrodynamics Asher Yahalom Variational principles for magnetohydrodynamics (MHD) were introduced by previous authors both in Lagrangian and Eulerian form. In this talk we introduce simpler Eulerian variational principles from which all the relevant equations of non-barotropic MHD can be derived for certain field topologies. The variational principle is given in terms of five independent functions for non-stationary non-barotropic flows. This is less than the eight variables that appear in the standard equations of barotropic MHD that are the magnetic field B the velocity field v, the entropy s and the density $\rho $. The case of non-barotropic MHD in which the internal energy is a function of both entropy and density was not discussed in previous works that were concerned with the simplistic barotropic case. It is important to understand the rule of entropy and temperature for the variational analysis of MHD. Thus, we introduce a variational principle of non-barotropic MHD and show that five functions will suffice to describe this physical system. We will also discuss the implications of the above analysis for topological constants. It will be shown that while cross helicity is not conserved for non-barotropic MHD a variant of this quantity is. The implications of this to non-barotropic MHD stability is discussed. Asher Yahalom ``Simplified Variational Principles for non-Barotropic Magnetohydrodynamics''. (ArXiv: 1510.00637 [Plasma Physics]) J. Plasma Phys. (2016), vol. 82, 905820204 \copyright Cambridge University Press 2016. [Preview Abstract] |
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