Browsing by Author "Maurer, David"

Now showing items 1-15 of 15

Control of Sawtooth Oscillation Dynamics using Externally Applied Stellarator Transform

Herfindal, Jeffrey (2016-12-09)

The control of sawtooth oscillations is an active area of tokamak research. The sawtooth oscillation is driven by ohmic heating of the core plasma until the safety factor drops below one triggering the growth of an m=n=1 ...

Density Limit Disruptions in the Compact Toroidal Hybrid Experiment

Kring, James (2021-08-03)

Density limit disruptions in toroidal plasma experiments have been an active area of research for decades. Density limit disruptions are plasma terminations that occur as the plasma density is increased. Plasma disruptions ...

Equilibrium Calculation with Toroidal Flow in NIMEQ

Markham, Tyler (2018-07-19)

The focus of this work is to demonstrate the importance of incorporating toroidal rotation in calculating tokamak-like equilibria with axisymmetry. Specifically, this work will focus on showing the impact toroidal flow had ...

Field Aligned Currents Derived from Pressue Profiles Obtained from TWINS ENA Images

Wood, Keith (2017-08-21)

Field aligned currents (FACs) are an important mechanism coupling the Earth's magnetosphere and ionosphere. The Two Wide-Angle Imaging Neutral-atom Spectrometers (TWINS) mission is the first stereoscopic neutral atom ...

Gyrokinetic Electron and Fully Kinetic Ion Particle Simulation on Current Sheet Instabilities

Wang, Zhenyu (2016-07-20)

Linear eigenmode stability properties of three-dimensional instabilities in a Harris current sheet with a finite guide magnetic field are systematically studied employing the gyrokinetic electron and fully kinetic ion ...

An investigation into the role of metastable states on excited populations of weakly ionized argon plasmas, with applications for optical diagnostics.

Arnold, Nicholas Ivan (2017-07-21)

Performing spectroscopic measurements of emission lines in relatively cold laboratory plasmas is challenging because the plasma is often neutral-dominated and is not in thermal equilibrium. However, these types of plasma ...

Investigation of Probe-Induced Dust Voids in a Weakly Magnetized Dusty Plasma

LeBlanc, Spencer (2019-12-06)

Dust voids, or regions free of dust grains surrounded by dusty plasmas, have been observed in a wide array of experimental configurations, from microgravity systems, to 3-dimensional dust clouds, to 2-dimensional monolayers. ...

Low edge safety factor disruptions in the Compact Toroidal Hybrid: Operation in the low-q regime, passive disruption avoidance and the nature of MHD precursors

Pandya, Mihir (2016-08-02)

The nominally axisymmetric (2-D) magnetic configuration in the form of a tokamak has proven to be the best candidate for a future reactor, and yet it is susceptible to instabilities which lead to a complete loss of the ...

Non-axisymmetric equilibrium reconstruction and suppression of density limit disruptions in a current-carrying stellarator

Ma, Xinxing (2018-03-29)

Reconstruction of non-axisymmetric, three-dimensional (3D) plasma equilibria is important for understanding 3D confinement and stability in stellarators as well as in nominally axisymmetric plasmas in tokamaks and ...

Particle Charge Determination in a Magnetized Dusty Plasma Flow

Funk, Dylan (2023-05-04)

Dusty plasmas consist of components typically found in a plasma (electrons, ions and neutral particles) as well as micrometer sized dust particles. The structural and dynamic properties of a dusty plasma system are ...

A spectroscopic neutral density diagnostic and exploration of the role of metastable states in fusion and astrophysical plasmas

Williamson, Eleanor (2023-12-04)

Understanding the transition region between fully ionized and neutrally dominated plasmas is important to the study of the magnetosphere of the earth, the corona/chromosphere transition regions of the sun, and detached ...

STRAHL modeling of iron impurity transport with on- and off-axis heating during the first divertor campaign on Wendelstein 7-X

Traverso, Peter (2021-12-07)

Impurity transport characterization and ultimately impurity control is critical to the future prospects of magnetic confinement fusion energy. In particular for an optimized stellarator like Wendelstein 7-X the characterization ...