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pro vyhledávání: '"Hatch, David"'
A fundamental dynamical constraint -- that fluctuation induced charge-weighted particle flux must vanish -- can prevent instabilities from accessing the free energy in the strong gradients characteristic of Transport Barriers (TBs). Density gradients
Externí odkaz:
http://arxiv.org/abs/2310.17107
Autor:
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 Microtearing modes (SLiM). A trained neutral network version of SLiM enables rapid assessment (
Externí odkaz:
http://arxiv.org/abs/2304.08982
Autor:
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 by a set of 61 nonlinear gyrokinetic simulations with input parameters taken from the pedes
Externí odkaz:
http://arxiv.org/abs/2201.07831
Autor:
Mathews, Abhilash, Francisquez, Manaure, Hughes, Jerry, Hatch, David, Zhu, Ben, Rogers, Barrett
Publikováno v:
Phys. Rev. E 104, 025205 (2021)
One of the most intensely studied aspects of magnetic confinement fusion is edge plasma turbulence which is critical to reactor performance and operation. Drift-reduced Braginskii two-fluid theory has for decades been widely applied to model boundary
Externí odkaz:
http://arxiv.org/abs/2009.05005
Autor:
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 the steep gradient region for a JET pedestal discharge (92174) where the electron temperatu
Externí odkaz:
http://arxiv.org/abs/2004.13634
Recent work has introduced a simple numerical method for solving partial differential equations (PDEs) with deep neural networks (DNNs). This paper reviews and extends the method while applying it to analyze one of the most fundamental features in nu
Externí odkaz:
http://arxiv.org/abs/1905.04351
The scaling of turbulent heat flux with respect to electrostatic potential is examined in the framework of a reduced ($4$D) kinetic system describing electrostatic turbulence in magnetized plasmas excited by the ion temperature gradient instability.
Externí odkaz:
http://arxiv.org/abs/1811.10534
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