Bulletin of the American Physical Society
2020 Annual Meeting of the APS Four Corners Section (Virtual)
Volume 65, Number 16
Friday–Saturday, October 23–24, 2020; Albuquerque, NM (Virtual)
Session E05: Plasma PhysicsLive
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Chair: Kevin Meaney, LANL |
Friday, October 23, 2020 2:00PM - 2:24PM Live |
E05.00001: The Light of Nuclear Fusion - Diagnosing Inertial Confinement Fusion Implosions with Gamma Rays Invited Speaker: Kevin Meaney Inertial confinement fusion is a nuclear fusion scheme that compresses nuclear fuel to achieve fusion conditions before the capsule rebounds and blows apart. For the last 10$+$ years, the world's largest laser has been used with the goal of achieving ignition -- gaining high fusion yield through forming a burning hot spot, driven by energy deposited through the deuterium-tritium (DT) fusion reaction. The National Ignition Facility has not yet achieved these conditions, but significant progress have been made. One valuable source of diagnostic information is the gamma rays that each ICF implosion releases, including the DT fusion reaction's 17 MeV gamma ray which is used for the time resolved fusion reaction history. The 4.4 MeV carbon ablator gamma rays also give insight into the compression of the shell of the capsule. A review of the state and future of progress of the ICF campaign and the diagnostic information and technology that goes into the gamma ray measurements with be shared. [Preview Abstract] |
Friday, October 23, 2020 2:24PM - 2:36PM Live |
E05.00002: Relativistic, Continuum DKE in NIMROD: Test Particle Operator Results Tyler Markham, Eric Held, Jeong-Young Ji, Andrew Spencer A ``runaway'' electron is an electron that, through a self-reinforcing process, accelerates to relativistic speeds. At multiple points throughout tokamak operation, relativistic runaway electron (RE) beams can form. RE beams pose a very serious risk in form of severe damage in ITER and future burning plasma reactors. This talk focuses primarily on the extension of the NIMROD code's kinetic capability by treating relativistic populations of electrons and their interactions with plasma fluid models. Specifically, results of the implementation of a relativistic test particle operator in NIMROD will be shown. [Preview Abstract] |
Friday, October 23, 2020 2:36PM - 2:48PM Live |
E05.00003: Plasma activated oil and cold atmospheric plasma as an emerging technology for wound healing. Milad Rasouli, Elaheh Amini A chronic wound is one that cannot heal and recover anatomic and functional integrity. Despite considerable efforts in developing strategies and marketing various therapeutic products, clinical success in curing chronic wounds has been limited. Cold atmospheric plasma (CAP) as an emerging technology that is a cocktail of physical and chemical factors, offering promising clinical applications by providing a multimodal action of reactive agents. Examples of CAP applications include wound healing, dentistry, antibacterial, food processing, antiviral, agricultural, blood coagulation, and cancer therapy. Two modes, namely direct plasma exposure and plasma-activated oil (PAO) are the two forms of in vitro and in vivo plasma treatments with demonstrated success. Here we investigate the ability of CAP and PAO to enhance cellular migration of dermal fibroblasts and epidermal keratinocytes. Also, we evaluate reactive oxygen and nitrogen species generated by CAP and the antimicrobial activity of CAP and PAO. [Preview Abstract] |
Friday, October 23, 2020 2:48PM - 3:00PM Not Participating |
E05.00004: Chapman-Jouguet Detonation for an Isomerization Reaction Osmar Aguirre, David Dunlap A detonation wave is a chemically-sustained shock wave, driven by the adiabatic expansion accompanying the exothermic transformation of a gaseous mixture, from reactants A to products B. The simplest illustration of the classical 1905 Chapman-Jouguet (CJ) theory of detonation that includes both chemical and mechanical processes is that of an ideal gas undergoing a hypothetical isomerization reaction. In such a case, the reaction A$\to $B describes a change in molecular conformation that is accompanied by the release of heat. In this talk we will use an isomerization reaction model as a platform from which to examine the long-standing controversy surrounding the thermodynamic stability of the CJ solution. [Preview Abstract] |
Friday, October 23, 2020 3:00PM - 3:12PM |
E05.00005: Developing efficient MD method for strongly coupled plasmas Jawon Jo, Eric D. Held, Jeong-Young Ji Molecular dynamics (MD) is one of the most intuitive techniques to analyze a many-body system such as a plasma. It considers interactions of all particle pairs in the system and solves Newton's equations of motion to calculate statistical quantities such as temperature. A great strength of MD is adequately analyzing statistical phenomena of the system which we can't analytically. For example, we can observe the time evolution of temperatures of various species in a plasma and calculate their equilibration time. A weakness is a huge amount of computational effort, $O(N^{2})$ for $N$ particles, to compute all interactions. Several efficient methods are developed: The Ewald sum reduces the computational effort to $O(N^{3/2})$, the particle-particle/particle-mesh method of Eastwood and Hockney to $O(N\log N)$, and the fast multipole method of Greengard and Rokhlin to $O(N)$. In this work, we develop a hybrid method that computes particle-particle interactions for up to neighboring cells and adopts the fast multipole method for distant cells. The hybrid method significantly reduces the computational effort for a large number of particles, $N>5\times10^{4}$. We present MD simulation results from studying temperature equilibration of two species for a strongly coupled plasma. [Preview Abstract] |
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