Search Results - "Hatch, David R"

A Look at Phase Space Intermittency in Magnetized Plasma Turbulence by Teaca, Bogdan, Navarro, Alejandro Bañón, Told, Daniel, Görler, Tobias, Plunk, Gabriel, Hatch, David R., Jenko, Frank

“…In a proton-electron magnetized plasma, we analyze turbulence at kinetic scales captured by a gyrokinetic formalism. The interval of scales spans the range…”
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A Gaussian process guide for signal regression in magnetic fusion by Michoski, Craig, Oliver, Todd A., Hatch, David R., Diallo, Ahmed, Kotschenreuther, Mike, Eldon, David, Waller, Matthew, Groebner, Richard, Nelson, Andrew Oakleigh

“…Abstract Extracting reliable information from diagnostic data in tokamaks is critical for understanding, analyzing, and controlling the behavior of fusion…”
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Ancient DNA reveals genotypic relationships among Oregon populations of the sea otter (Enhydra lutris) by Valentine, Kim, Duffield, Deborah A., Patrick, Lorelei E., Hatch, David R., Butler, Virginia L., Hall, Roberta L., Lehman, Niles

“…The sea otter has experienced a dramatic population decline caused by intense human harvesting, followed by a century of recovery including relocation efforts…”
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Solving differential equations using deep neural networks by Michoski, Craig, Milosavljević, Miloš, Oliver, Todd, Hatch, David R.

“…•A novel framework for solving irregular PDEs using Deep Neural Networks (DNNs) is developed, extended, and analyzed.•The framework demonstrates phenomenal…”
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Solving differential equations using deep neural networks by Michoski, Craig, Milosavljević, Miloš, Oliver, Todd, Hatch, David R.

“…Recent work on solving partial differential equations (PDEs) with deep neural networks (DNNs) is presented. The paper reviews and extends some of these methods…”
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A Gaussian process guide for signal regression in magnetic fusion by Michoski, Craig, Oliver, Todd A., Hatch, David R., Diallo, Ahmed, Kotschenreuther, Mike, Eldon, David, Waller, Matthew, Groebner, Richard, Nelson, Andrew Oakleigh

“…Extracting reliable information from diagnostic data in tokamaks is critical for understanding, analyzing, and controlling the behavior of fusion plasmas and…”
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Transport Barriers in magnetized plasmas- general theory with dynamical constraints by Kotschenreuther, M., Liu, X., Mahajan, S.M., Hatch, D.R., Merlo, G.

“…Abstract A fundamental dynamical constraint—that fluctuation induced charge-weighted particle flux must vanish- can prevent instabilities from accessing the…”
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Stability and transport of gyrokinetic critical pedestals by Parisi, Jason, Nelson, Andrew Oakleigh, Guttenfelder, Walter, Gaur, Rahul, Berkery, John W., Kaye, Stanley M., Barada, Kshitish Kumar, Clauser, Cesar F., Diallo, Ahmed, Hatch, David R., Kleiner, Andreas, Lampert, Mate, Macwan, Tanmay, Menard, Jonathan E

“…A gyrokinetic threshold model for pedestal width-height scaling predic- tion is applied to multiple devices. A shaping and aspect-ratio scan is per- formed on…”
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Modeling electron temperature profiles in the pedestal with simple formulas for ETG transport by Hatch, D.R., Kotschenreuther, M.T., Li, P.-Y., Chapman-Oplopoiou, B., Parisi, J., Mahajan, S.M., Groebner, R.

“…Abstract This paper reports on the refinement (building on (Hatch D.R. et al 2022 Phys. Plasmas 29 062501)) and application of simple formulas for electron…”
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Stability and transport of gyrokinetic critical pedestals by Parisi, J.F., Nelson, A.O., Guttenfelder, W., Gaur, R., Berkery, J.W., Kaye, S.M., Barada, K., Clauser, C., Diallo, A., Hatch, D.R., Kleiner, A., Lampert, M., Macwan, T., Menard, J.E.

“…Abstract A gyrokinetic threshold model for pedestal width–height scaling prediction is applied to multiple devices. A shaping and aspect ratio scan is…”
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Analysis and compression of six-dimensional gyrokinetic datasets using higher order singular value decomposition by Hatch, D.R., del-Castillo-Negrete, D., Terry, P.W.

“…Higher order singular value decomposition (HOSVD) is explored as a tool for analyzing and compressing gyrokinetic data. An efficient numerical implementation…”
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Transport Barriers in Magnetized Plasmas -- General Theory with Dynamical Constraints by Kotschenreuther, Mike, Liu, Xing, Mahajan, Swadesh M, Hatch, David R, Merlo, Gabriele

“…A fundamental dynamical constraint -- that fluctuation induced charge-weighted particle flux must vanish -- can prevent instabilities from accessing the free…”
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Mode Analyses of Gyrokinetic Simulations of Plasma Microturbulence by Hatch, David R

“…This thesis presents analysis of the excitation and role of damped modes in gyrokinetic simulations of plasma microturbulence. In order to address this…”
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Microtearding mode study in NSTX using machine learning enhanced reduced model by Curie, Max T, Larakers, Joel, Parisi, Jason, Staebler, Gary, Munaretto, Stefano, Guttenfelder, Walter, Belli, Emily, Hatch, David R, Lampert, Mate, Avdeeva, Galina, Neiser, Tom, Smith, Sterling, Diallo, Ahmed, Nelson, Oak, Kaye, Stanley, Fredrickson, Eric, Manela, Joshua M, Lei, Shelly, Halfmoon, Michael, Tennery, Matthew M, Hassan, Ehab

“…This article presents a survey of NSTX cases to study the microtearing mode (MTM) stabilities using the newly developed global reduced model for Slab-Like…”
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Reduced models for ETG transport in the pedestal by Hatch, David R, Michoski, Craig, Kuang, Dongyang, Chapman-Oplopoiou, Ben, Curie, Max, Halfmoon, Michael, Hassan, Ehab, Kotschenreuther, Mike, Mahajan, Swadesh M, Merlo, Gabriele, Pueschel, M. J, Walker, Justin, Stephens, Cole D

“…This paper reports on the development of reduced models for electron temperature gradient (ETG) driven transport in the pedestal. Model development is enabled…”
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Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals by Parisi, Jason F, Parra, Felix I, Roach, Colin M, Giroud, Carine, Dorland, William, Hatch, David R, Barnes, Michael, Hillesheim, Jon C, Aiba, Nobuyuki, Ball, Justin, Ivanov, Plamen G, Contributors, JET

“…Local linear gyrokinetic simulations show that electron temperature gradient (ETG) instabilities are the fastest growing modes for $k_y \rho_i \gtrsim 0.1$ in…”
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Mode Analyses of Gyrokinetic Simulations of Plasma Microturbulence by Hatch, David R

“…This thesis presents analysis of the excitation and role of damped modes in gyrokinetic simulations of plasma microturbulence. In order to address this…”
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Identification of vortexes obstructing the dynamo mechanism in laboratory experiments by Limone, Angelo, Hatch, David R, Forest, Cary B, Jenko, Frank

“…The magnetohydrodynamic dynamo effect explains the generation of self-sustained magnetic fields in electrically conducting flows, especially in geo- and…”
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Optimization at Wyoming gas plant improves profitability by SAHA, L. E, CHONTOS, A. J, HATCH, D. R

“…This paper reports on a computer-aided manufacturing system for on-line optimization implemented at the Painter complex (Wyoming) gas-processing plant. The…”
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Arctic Fox Migrations in Manitoba by Wrigley, Robert E., Hatch, David R. M.

“…A review is provided of the long-range movements and migratory behaviour of the arctic fox in Manitoba. During the period 1919-75, peaks in population tended…”
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