A5040498994- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Geomagnetism and Paleomagnetism Studies
- Fluid Dynamics and Turbulent Flows
- Fusion materials and technologies
- Astro and Planetary Science
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Complex Systems and Time Series Analysis
- Gas Dynamics and Kinetic Theory
- Advanced Data Storage Technologies
- Fluid Dynamics and Mixing
- Meteorological Phenomena and Simulations
- Particle Dynamics in Fluid Flows
- Computational Physics and Python Applications
- Wind and Air Flow Studies
- Laser Design and Applications
- Electrohydrodynamics and Fluid Dynamics
- Flow Measurement and Analysis
- Cyclone Separators and Fluid Dynamics
- Advanced Control Systems Optimization
- Nuclear Physics and Applications
- Process Optimization and Integration
Bryn Mawr College
2015-2023
ETH Zurich
2019
Swarthmore College
2014-2018
University of California, Los Angeles
2006-2013
UCLA Health
2010
DSM (Netherlands)
2006
Roche (Switzerland)
2002
Abstract Emulsions now find a wide range of applications in industry and daily life. In the pharmaceutical lipophilic active ingredients as well many nutritional products such vitamins are often formulated dispersed phase oil‐in‐water emulsions. can be produced with different mechanical emulsification techniques. following review, process rotor‐stator systems disc compared to other popular systems. On basis experimental results from authors' laboratory, discontinuous gear‐rim dispersing...
The Bandt-Pompe permutation entropy and the Jensen-Shannon statistical complexity are used to analyze fluctuating time series of three different turbulent plasmas: magnetohydrodynamic (MHD) turbulence in plasma wind tunnel Swarthmore Spheromak Experiment (SSX), drift-wave ion saturation current fluctuations edge Large Plasma Device (LAPD), fully developed magnetic solar taken from $\mathit{Wind}$ spacecraft. values presented as coordinates on $\mathit{CH}$ plane for comparison among...
The fusion energy research and development landscape has seen significant advances in recent years, with important scientific technological breakthroughs a rapid rise of investment the private sector. workforce needs nascent industry are growing at rate that academic programs not currently able to match. This paper presents findings Workforce Accelerator for Fusion Energy Development Conference held Hampton, Virginia, United States America (USA), on May 29-30 2024, which was funded by US...
MagNetUS is a network of scientists and research groups that coordinates advocates for fundamental magnetized plasma in the USA. Its primary goal to bring together broad community researchers experimental numerical tools they use order facilitate sharing ideas, resources common tasks. Discussed here are motivation goals this details its formation, history structure. An overview associated facilities projects provided, along with examples scientific topics investigated therein. Finally,...
Continuous control over azimuthal flow and shear in the edge of Large Plasma Device (LAPD) has been achieved using a biasable limiter which allowed careful study effect on pressure-gradient-driven turbulence transport LAPD. The LAPD rotates spontaneously ion diamagnetic direction; positive bias first reduces, then minimizes (producing near-zero state), finally reverses into electron direction. Degradation particle confinement is observed minimum shearing state reduction turbulent flux with...
Turbulence has been studied in laboratory plasmas for decades. Magnetic and electrostatic turbulence fluctuations have implicated degraded confinement fusion devices so understanding turbulent transport is critical those devices. The externally applied magnetic field most a strong effect on the character of (particularly parallel perpendicular to field). A new plasma source described with several unique features. First, magnetohydrodynamic (MHD) wind tunnel configuration no net axial flux....
Energy dynamics calculations in a 3D fluid simulation of drift wave turbulence the linear Large Plasma Device (LAPD) [W. Gekelman et al., Rev. Sci. Inst. 62, 2875 (1991)] illuminate processes that drive and dissipate turbulence. These reveal nonlinear instability dominates injection energy into by overtaking when fluctuations about equilibrium are small. The drives flute-like ($k_\parallel = 0$) density using free from background gradient. Through axial wavenumber transfer to $k_\parallel...
A new turbulent plasma source at the Swarthmore Spheromak Experiment (SSX) facility is described. The MHD wind tunnel configuration employs a magnetized gun to inject high-beta into large, well-instrumented, vacuum drift region. This provides unique laboratory conditions approaching that in solar wind: there no applied background magnetic field region and has net axial flux; flow speed on order of local sound ( M ~ 1), so energy density comparable thermal density; ratio pressure unity...
Continuous control over azimuthal flow and shear in the edge of Large Plasma Device (LAPD) [W. Gekelman et al., Rev. Sci. Instr. 62, 2875 (1991)] has been achieved using a biasable limiter. This allowed careful study effect on pressure-gradient-driven turbulence particle transport LAPD. The combination externally controllable turbulent plasma along with detailed spatial diagnostic capabilities LAPD makes experiment useful testbed for validation suppression models. Motivated by these models,...
Abstract We have measured the radiation tolerance of poly-crystalline and single-crystalline diamonds grown by chemical vapor deposition (CVD) process measuring charge collected before after irradiation in a 50 m pitch strip detector fabricated on each diamond sample. irradiated one group sensors with 800 MeV protons, second 24 GeV steps, to protons cm −2 respectively. observe sum mean drift paths for electrons holes both CVD decreases fluence from its initial value according simple damage...
We provide a tutorial on the paradigms and tools of magnetohydrodynamic (MHD) turbulence. The principal paradigm is that turbulent cascade from large scales to small, resulting in power law behavior for frequency spectrum magnetic fluctuations EB(f). will describe five useful statistical MHD turbulence time domain: temporal autocorrelation function, spectrum, probability distribution function increments, structure permutation entropy. Each these be illustrated with an example taken solar...
Both multifractal and monofractal scaling of structure function exponents are observed in the turbulent magnetic fluctuations Swarthmore Spheromak Experiment plasma. Structure probability distribution (PDF) analysis exhibits low frequency, inertial range turbulence but higher dissipation fluctuations. The transition from to occurs rapidly suggesting a mechanism that is insensitive scale size. functions PDFs presented for both temporal spatial measurements. Variations helicity plasma also...
The nature of MHD turbulence is analyzed through both temporal and spatial magnetic fluctuation spectra. A magnetically turbulent plasma produced in the wind-tunnel configuration Swarthmore Spheromak Experiment (SSX). power fluctuations projected into directions perpendicular parallel to a local mean field; ratio these quantities shows presence variance anisotropy which varies as function frequency. Comparison amongst magnetic, velocity, density spectra are also made, demonstrating that...
The absorption of fast Alfvén waves (FW) by ion cyclotron harmonic damping in the range harmonics from 4th to 8th is studied theoretically and with experiments DIII-D tokamak. A formula for linear on ions an arbitrary distribution function which symmetric about magnetic field used estimate single-pass various cases experimental interest. It found that neutral beam injection can be significant even at if beta, energy background plasma density are high enough geometry appropriate. predictions...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation S. Zhou, W. Heidbrink, H. Boehmer, R. McWilliams, T. A. Carter, Vincena, B. Friedman, D. Schaffner; Sheared-flow induced confinement transition in a linear magnetized plasma. Phys. Plasmas 1 January 2012; 19 (1): 012116. https://doi.org/10.1063/1.3677361 Download citation file: Ris (Zotero) Reference Manager...
We have explored the thermodynamics of compressed magnetized plasmas in laboratory experiments and we call these studies ‘magnetothermodynamics’. The are carried out Swarthmore Spheromak eXperiment device. In this device, a plasma source is located at one end other end, closed conducting can installed. generate parcels observe their compression against wall cylinder. parameters such as density, temperature magnetic field measured during using HeNe laser interferometry, ion Doppler...
We have previously generated elongated Taylor double-helix flux rope plasmas in the SSX MHD wind tunnel. These are remarkable their rapid relaxation (about one Alfv\'en time) and description by simple analytical force-free theory despite high plasma beta internal flow speeds. report on turbulent features observed these including frequency spectra, autocorrelation function, probability distribution functions of increments. discuss here possibility that turbulence facilitating access to final...
We report measurements of the equations state a fully relaxed magnetohydrodynamic (MHD) laboratory plasma. Parcels magnetized plasma, called Taylor states, are formed in coaxial plasma gun, and allowed to relax drift into closed flux conserving volume. Density, ion temperature, magnetic field measured as function time states compress heat. The theoretically predicted MHD double adiabatic compared experimental measurements. find that equation is inconsistent with our data.
The intermittency in turbulent magnetic field fluctuations has been observed to scale with the amount of helicity injected into a laboratory plasma. An unstable spheromak MHD wind tunnel Swarthmore Spheromak Experiment displays and plasma as it relaxes Taylor state. level this turbulence is determined by finding flatness probability distribution function increments for pickup coil B˙(t). increases helicity, but spectral indices are unaffected variation. While evidence provided which supports...
Abstract It is widely accepted that stars in a spiral disk, like the Milky Way’s, can radially migrate on order of scale length over disk’s lifetime. With exception cold torquing, also known as “churning,” processes contribute to radial migration are necessarily associated with kinematic heating. Additionally, it an open question whether or not episode torquing kinematically long distances. This study uses suite analytically based simulations investigate dynamical response when subject and...
Fine emulsions, i.e. a dispersion of fine liquid droplets in another liquid, can be obtained by forced flow coarse predispersion through small orifices. Direct observations at the original scale is nearly impossible. A promising solution large scale-up, considering most important factors. The experiments presented here were conducted on model 250 times size, while maintaining strong hydromechanical similarity. breakup single oil water was documented with highspeed camera.
This white paper summarizes major scientific challenges and opportunities in understanding magnetic reconnection related explosive phenomena as a fundamental plasma process.
The fluid Taylor scale is measured in the Bryn Mawr Experiment (BMX) of Plasma Laboratory and examined as a potential dissipation magnetic turbulence within plasma. We present first laboratory measurements turbulent magnetized plasma through multi-point correlations broadband fluctuations. From spatial temporal correlations, respectively, scales are 2±1 3±1 cm. These on same order magnitude estimated ion BMX with inertial between 1 10 cm gyroscales 0.1 1.0 these measurements, Reynolds number...