Explanipedia

COMPARATIVE STUDY ON THE PERFORMANCE OF TYPE A AND TYPE B MICROPILED SYSTEMS IN SANDY SOIL UNDER VERTICAL LOADS FOR OPTIMIZING BEARING CAPACITIES Open

Ehab Hassan, Hussein Mostafa, Wagdy Mohammed Elbanna, Mohammed Hasanin Rabie · 2025

SENSITIVITY OF CORE TRANSPORT PREDICTION TO THE SEPARATRIX TEMPERATURE AND DENSITY IN TOKAMAK L-MODE AND OHMIC REGIMES Open

G. M. Staebler, Ehab Hassan, Jin Myung Park, J. E. Kinsey · 2024

Successful prediction of tokamak transport in the L-mode regime Open

G. M. Staebler, J.M. Park, Ehab Hassan, C. Angioni, E. Fable , et al. · 2024

A long standing shortfall in the predicted L-mode edge energy transport by reduced quasi-linear models of gyrokinetic turbulent transport has been resolved. The improved model TGLF-SAT2 has higher fidelity to gyrokinetic simulations of the…

INTEGRATED PLASMA AND ENGINEERING DESIGN AND ASSESSMENT FOR TOKAMAK REACTOR COMPONENTS Open

C. Collins, Jin Myung Park, Rhea Barnett, Katarzyna Borowiec, Ehab Hassan , et al. · 2024

Searching the Plasma Geometry and Configuration Spaces for Feasible Tokamak Design Point Open

Ehab Hassan, C. Kessel, Jin Myung Park, P.B. Snyder, Cami Collins · 2023

Microtearding mode study in NSTX using machine learning enhanced reduced model Open

Max T. Curie, J. L. Larakers, Jason Parisi, G. M. Staebler, S. Munaretto , et al. · 2023

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 a…

Erratum: “Gyrokinetic benchmark of the electron temperature-gradient instability in the pedestal region” [Phys. Plasmas <b>28</b>, 062505 (2021)] Open

Ehab Hassan, D. R. Hatch, W. Guttenfelder, Yang Chen, Scott Parker · 2023

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Core-Pedestal Plasma Configurations in Advanced Tokamaks Open

Ehab Hassan, C. Kessel, J.M. Park, Wael Elwasif, R. E. Whitfield , et al. · 2023

Here, several configurations for the core and pedestal plasma are examined for a predefined tokamak design by implementing multiple heating/current drive (H/CD) sources to achieve an optimum configuration of high fusion power in a noninduc…

Imaging the Future Threats of the Sand Dunes Along the Northwestern Coast of Nile Delta Using SAR Open

Rabab Ramadan, Ehab Hassan, Ashraf Yahia, Ahmed Gaber · 2023

Gyrokinetic analysis of inter-edge localized mode transport mechanisms in a DIII-D pedestal Open

Michael Halfmoon, D. R. Hatch, M. Kotschenreuther, S. M. Mahajan, A. Nelson , et al. · 2022

In this study, gyrokinetic simulations are used to study pedestal fluctuations for DIII-D discharge 174082 using the GENE code. Nonlinear local simulations indicate that electron heat flux has contributions from electron temperature gradie…

Gyrokinetic simulations compared with magnetic fluctuations diagnosed with a Faraday-effect radial interferometer-polarimeter in the DIII-D pedestal Open

M. Curie, D. R. Hatch, Michael Halfmoon, J. Chen, D. L. Brower , et al. · 2022

Experimental data on electromagnetic fluctuations in DIII-D, made available by the Faraday-effect radial interferometer-polarimeter (RIP) diagnostic Chen (2016 Rev. Sci. Instrum. 87 11E108), is examined in comparison with detailed gyrokine…

Reduced models for ETG transport in the tokamak pedestal Open

D. R. Hatch, Craig Michoski, Dongyang Kuang, B. Chapman, M. Curie , et al. · 2022

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 fro…

A survey of pedestal magnetic fluctuations using gyrokinetics and a global reduced model for microtearing stability Open

M. Curie, J. L. Larakers, D. R. Hatch, A. Nelson, A. Diallo , et al. · 2022

This article presents a global reduced model for slab-like microtearing modes (MTMs) in the H-mode pedestal, which reproduces distinctive features of experimentally observed magnetic fluctuations, such as chirping and discrete frequency ba…

Reduced models for ETG transport in the pedestal Open

D. R. Hatch, Craig Michoski, Dongyang Kuang, M. Curie, Michael Halfmoon , et al. · 2022

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 fro…

Identifying the microtearing modes in the pedestal of DIII-D H-modes using gyrokinetic simulations Open

Ehab Hassan, D. R. Hatch, Michael Halfmoon, M. Curie, M. T. Kotchenreuther , et al. · 2021

Recent evidence points toward the microtearing mode (MTM) as an important fluctuation in the H-mode pedestal for anomalous electron heat transport. A study of the instabilities in the pedestal region carried out using gyrokinetic simulatio…

Gyrokinetic benchmark of the electron temperature-gradient instability in the pedestal region Open

Ehab Hassan, D. R. Hatch, W. Guttenfelder, Y. Chen, Scott Parker · 2021

Transport from turbulence driven by the electron temperature-gradient (ETG) instability is likely a major source of electron heat losses through the pedestal. Due to extreme gradients and strong shaping, ETG instabilities in the pedestal a…

Microtearing modes as the source of magnetic fluctuations in the JET pedestal Open

D. R. Hatch, M. Kotschenreuther, S. M. Mahajan, M. J. Pueschel, Craig Michoski , et al. · 2020

We report on a detailed study of magnetic fluctuations in the JET pedestal, employing basic theoretical considerations, gyrokinetic simulations, and experimental fluctuation data to establish the physical basis for their origin, role, and …

FY19 FES Theory Performance Target (Final Report) Open

D. R. Hatch, M. Kotschenreuther, S. M. Mahajan, Michael Halfmoon, Ehab Hassan , et al. · 2020

Understanding the relevant turbulent transport mechanisms at the edge of a high-performance tokamak is essential for predicting and optimizing the H-mode pedestal structure in future burning plasma devices. Global electromagnetic gyrokinet…

Plasma turbulence in the equatorial electrojet: A two-dimensional Hamiltonian fluid model Open

Ehab Hassan, I. Keramidas Charidakos, P. Morrison, D. R. Hatch, W. Horton · 2017

A nonlinear unified fluid model that describes the Equatorial Electrojet, including the Farley-Buneman and gradient-drift plasma instabilities, is defined and shown to be a noncanonical Hamiltonian system. Two geometric constants of motion…

Multiscale equatorial electrojet turbulence: Energy conservation, coupling, and cascades in a baseline 2‐D fluid model Open

Ehab Hassan, D. R. Hatch, P. Morrison, W. Horton · 2016

Progress in understanding the coupling between plasma instabilities in the equatorial electrojet based on a unified fluid model is reported. Simulations with parameters set to various ionospheric background conditions revealed properties o…

Plasma turbulence in the equatorial electrojet observations, theories, models, and simulations Open

Ehab Hassan · 2016

The plasma turbulence in the equatorial electrojet due to the presence of two different plasma instability mechanisms has been observed and studied for more than seven decades. The sharp density-gradient and large conductivity give rise to…

2015 Los Alamos Space Weather Summer School Research Reports Open

Misa Cowee, Yuxi Chen, Ravindra Desai, Ehab Hassan, N. M. E. Kalmoni , et al. · 2015

The fifth Los Alamos Space Weather Summer School was held June 1st - July 24th, 2015, at Los Alamos National Laboratory (LANL). With renewed support from the Institute of Geophysics, Planetary Physics, and Signatures (IGPPS) and additional…

Multiscale equatorial electrojet turbulence:Baseline 2‐D model Open

Ehab Hassan, W. Horton, A. I. Smolyakov, D. R. Hatch, S. K. Litt · 2015

The spatial and spectral characteristics of the turbulent plasma density, electric fields, and ion drift in ionospheric E region are studied using a new set of nonlinear plasma fluid equations. The fluid model combines both Farley‐Buneman …

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