A5102815737- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Mercury impact and mitigation studies
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Atmospheric and Environmental Gas Dynamics
- Solar and Space Plasma Dynamics
- Toxic Organic Pollutants Impact
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Air Quality and Health Impacts
- Urban Green Space and Health
- Mesoporous Materials and Catalysis
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Quantum Dots Synthesis And Properties
- Land Use and Ecosystem Services
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Catalytic Processes in Materials Science
- Plasma Applications and Diagnostics
- Advanced Chemical Physics Studies
- Urban Heat Island Mitigation
- Atmospheric Ozone and Climate
Energetics (United States)
2019
University of Washington
1995-2019
University of New Mexico
1993-2018
Seattle University
2012
Peking University
2011
Impact Technology Development (United States)
2009
Abstract. Atmospheric deposition of Hg(II) represents a major input mercury to surface environments. The phase (gas or particle) has important implications for deposition. We use long-term observations reactive gaseous (RGM, the component Hg(II)), particle-bound (PBM, particulate fine matter (PM2.5), and temperature (T) at five sites in North America derive an empirical gas-particle partitioning relationship log10(K−1) = (10±1)–(2500±300)/T where K (PBM/PM2.5)/RGM with PBM RGM common mixing...
Abstract. We present a new model for the global tropospheric chemistry of inorganic bromine (Bry) coupled to oxidant-aerosol in GEOS-Chem chemical transport (CTM). Sources Bry include debromination sea-salt aerosol, photolysis and oxidation short-lived bromocarbons, from stratosphere. Comparison GOME-2 satellite climatology BrO columns shows that can reproduce observed increase with latitude, northern mid-latitudes maximum winter, Arctic spring. This successful simulation is contingent on...
Abstract. We have developed a new nested-grid mercury (Hg) simulation over North America with 1/2° latitude by 2/3° longitude horizontal resolution employing the GEOS-Chem global chemical transport model. Emissions, chemistry, deposition, and meteorology are self-consistent between nested domains. Compared to model (4° 5° longitude), shows improved skill at capturing high spatial temporal variability of Hg wet deposition observed Mercury Deposition Network (MDN) in 2008–2009. The resolves...
Abstract. Simulations using the fully coupled WRF/Chem (Weather Research and Forecasting – Chemistry) model at 3-km resolution in Mexico City have been performed to examine temperature, relative humidity, wind, gaseous criteria pollutants (CO, O3, NO, NO2, NOy) during MCMA-2006/MILAGRO field campaign. Comparison of simulations with measurements from ground-based air quality monitoring network (RAMA) is presented. The resolves reasonably well observed surface humidity wind speed; however,...
The sheared-flow stabilized $Z$-pinch has demonstrated long-lived plasmas with fusion-relevant parameters. This Letter presents the first experimental results demonstrating sustained, quasi-steady-state neutron production from Fusion Experiment (FuZE), operated a mixture of 20% deuterium/80% hydrogen by volume. Neutron emissions lasting approximately $5~\mu$s are reproducibly observed pinch currents $200$ kA during an $16~\mu$s period plasma quiescence. average yield is estimated to be...
The Hel icon- Cat hode(HelCat) device is a medium-size linear experiment suitable for wide range of basic plasma science experiments in areas such as electrostatic turbulence and transport, magnetic relaxation, high power microwave (HPM)-plasma interactions. HelCat based on dual sources located at opposite ends the 4 m long vacuum chamber – an RF helicon source one end thermionic cathode other. Thirteen coils provide axial field B ⩾ 0.220 T that can be configured individually to give various...
The Fusion Z Pinch Experiment (FuZE) investigates sheared-flow stabilization of classic m = 0 and 1 instabilities in pinches with an embedded axial flow. FuZE consists a 100 cm coaxial plasma accelerator, where neutral gas is ionized accelerated pulsed electrical discharge, followed by 50 assembly region, are formed. Maintaining the pinch requires continuous injection provided deflagration mode accelerator. Two discharge modes, without deflagration, investigated on FuZE. formation observed...
Abstract. A global-scale three dimensional atmospheric transport and chemistry model was applied to simulate transpacific of Benzo[a]pyrene (BaP) emitted from Asia. The results were compared with observations at six monitoring sites. annual mean seasonal variation patterns the contributions different Asian source regions flux investigated. episodic nature also systematically explored. Interannual variability BaP assessed during period 1948–2007. Results showed that strong enhancements...
Injection of coaxial-gun-formed magnetized plasmas into a background transverse vacuum magnetic field or plasma has been studied in the helicon-cathode (HelCat) linear device at University New Mexico [M. Gilmore et al., J. Plasma Phys. 81, 345810104 (2015)]. A jet launched shows emergent kink stabilization due to formation sheared flow above threshold 0.1kVA [Y. Zhang Plasmas 24, 110702 (2017)]. spheromak-like led observation finger-like structures on side with stronger null between...
We report experimental results on the injection of a magnetized plasma jet into transverse background magnetic field in HelCat linear device at University New Mexico [M. Gilmore et al., J. Plasma Phys. 81, 345810104 (2015)]. After leaves plasma-gun muzzle, tension force arising from an increasing curvature induces sheared axial-flow gradient above theoretical kink-stabilization threshold. observe that this emergent axial flow stabilizes n=1 kink mode jet, whereas instability is observed when...
In order to investigate the role of both neutral and ion dynamics in large-scale helicon discharges, a laser induced fluorescence (LIF) system capable measuring ArI ArII using single tunable is being developed. The based on >250 mW solid state laser. For measurements, pumps metastable (2P03/2)4s level (2P01/2)4p 696.7352 nm light, radiation from decay (2P01/2)4s at 772.6333 observed. ArII, currently development, (3P)3d 4F7/2 will be pumped (3P)4p 4D07/2 688.8511 nm, (3P)4s 4P5/2...
The fusion Z-pinch experiment device produces a 0.3 cm radius by 50 cm-long Z pinch between the end of inner electrode coaxial plasma gun and an wall away. column is stabilized for thousands instability growth times embedded radially sheared axial flow. To investigate effect design on behavior, solid with central exhaust port replaced spoked hub. While behavior was largely unaffected, exhausted from provides experimental platform to study magnetic confinement detachment. Current density...
The design of a compact coaxial magnetized plasma gun and its associated hardware systems are discussed in detail. is used for experimental studies magnetic bubble expansion into lower pressure background as laboratory model extragalactic radio lobe the interstellar medium. powered by 120 ¿F, 10 kV ignitron-switched capacitor bank. High-pressure gas puffed an annular gap between inner outer electrodes. applied high voltage ionizes creates radial current sheet. ~100 kA discharge generates...
Summary form only given. The HELCAT (helicon-cathode) device is a dual-source linear plasma that has recently begun full operation at the University of New Mexico. 4 m long, 50 cm diameter, with axial magnetic field < 2.2 kG. An RF helicon source tunable frequency 10 -30 MHz and P 5 kW, resides one end device, while thermionic BaO-Ni cathode capable discharge currents up to 2.5 kA located other end. Nominal parameters are: T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Summary form only given. We discuss the design of a compact coaxial magnetized plasma gun and its associated systems in detail. The will be used for experimental studies relaxation to conducted HELCAT facility at UNM. These advance our knowledge basic physics areas magnetic space astrophysical plasmas, including evolution active galactic jets. powered by 120 muF ignitron switched capacitor bank which is operated range 5 ~ 10kV. High pressure gas puffed into an annular gap between inner outer...
The sheared-flow stabilized Z-pinch has demonstrated long-lived plasmas with fusion-relevant plasma parameters. Experimental demonstration of sustained neutron production from the Fusion Experiments (FuZE) at University Washington, operated a 20% deuterium mixture, been reported. Neutron emissions lasting ~5 us are reproducibly observed peak pinch currents ~200 kA. lower limit on yield is estimated to be 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
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