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View article: Accelerating the fusion workforce in the USA
Accelerating the fusion workforce in the USA Open
The fusion energy research and development landscape has seen significant advances in recent years, with important scientific and technological breakthroughs and a rapid rise of investment in the private sector. The workforce needs of the …
View article: Machine-learned trends in mirror configurations in the large plasma device
Machine-learned trends in mirror configurations in the large plasma device Open
This study demonstrates the efficacy of machine learning (ML)-based trend inference using data from the large plasma device (LAPD). The LAPD is a flexible basic plasma science device with a high discharge repetition rate (0.25–1 Hz) and re…
View article: Wave coupling and propagation from a fast-wave antenna in the lower hybrid range of frequencies
Wave coupling and propagation from a fast-wave antenna in the lower hybrid range of frequencies Open
A set of experiments were conducted on the LArge Plasma Device (LAPD) at UCLA to test the operational principles of a traveling wave antenna of the comb-line type. This antenna was designed to launch helicon waves (fast waves in the lower …
View article: Physics of beam-driven ion cyclotron emission in the large plasma device
Physics of beam-driven ion cyclotron emission in the large plasma device Open
Ion cyclotron emission (ICE) is widely observed from spatially localised minority energetic ion populations in toroidal magnetically confined fusion (MCF) plasmas, both tokamaks and stellarators. Its spectral structure is typically regular…
View article: Measurement of Energy Reduction of Inertial Alfvén Waves Propagating through Parallel Gradients in the Alfvén Speed
Measurement of Energy Reduction of Inertial Alfvén Waves Propagating through Parallel Gradients in the Alfvén Speed Open
We have studied the propagation of inertial Alfvén waves through parallel gradients in the Alfvén speed using the Large Plasma Device at the University of California, Los Angeles. The reflection and transmission of Alfvén waves through inh…
View article: Turbulence and transport in mirror geometries in the Large Plasma Device
Turbulence and transport in mirror geometries in the Large Plasma Device Open
Thanks to advances in plasma science and enabling technology, mirror machines are being reconsidered for fusion power plants and as possible fusion volumetric neutron sources. However, cross-field transport and turbulence in mirrors remain…
View article: Accelerating the Fusion Workforce
Accelerating the Fusion Workforce Open
The fusion energy research and development landscape has seen significant advances in recent years, with important scientific and technological breakthroughs and a rapid rise of investment in the private sector. The workforce needs of the …
View article: Linear gyrokinetic simulations of toroidal Alfvén eigenmodes in the Mega-Amp Spherical Tokamak
Linear gyrokinetic simulations of toroidal Alfvén eigenmodes in the Mega-Amp Spherical Tokamak Open
Linear gyrokinetic (GK) simulations using the Gyrokinetic Toroidal Code (GTC) [Lin et al., “Turbulent transport reduction by zonal flows: Massively parallel simulations,” Science 281, 1835–1837 (1998)] have been performed to investigate To…
View article: Turbulence and transport in mirror geometries in the Large Plasma Device
Turbulence and transport in mirror geometries in the Large Plasma Device Open
Thanks to advances in plasma science and enabling technology, mirror machines are being reconsidered for fusion power plants and as possible fusion volumetric neutron sources. However cross-field transport and turbulence in mirrors remains…
View article: Understanding the L-H isotope effect at the DIII-D tokamak and advancements in synthetic turbulence diagnostics
Understanding the L-H isotope effect at the DIII-D tokamak and advancements in synthetic turbulence diagnostics Open
It is determined that while heat flux differences between hydrogen and deuterium isotope experiments result from natural differences in carbon impurity content at DIII-D, it is not the origin of the low to high confinement mode (L-H) trans…
View article: Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes
Experimental Study of Alfvén Wave Reflection from an Alfvén-speed Gradient Relevant to the Solar Coronal Holes Open
We report the first experimental detection of a reflected Alfvén wave from an Alfvén-speed gradient under conditions similar to those in coronal holes. The experiments were conducted in the Large Plasma Device at the University of Californ…
View article: Report of the FESAC Facilities Construction Projects Subcommittee
Report of the FESAC Facilities Construction Projects Subcommittee Open
On December 1, 2023, the Director of the of the Office of Science (SC) charged all the Department of Energy Office of Science Federal Advisory Committees to respond to look toward the scientific horizon and identify what new or upgraded fa…
View article: On the origin of the DIII-D L-H power threshold isotope effect
On the origin of the DIII-D L-H power threshold isotope effect Open
The increased low to high confinement mode (L to H-mode) power threshold in DIII-D low collisionality hydrogen plasmas (compared to deuterium) is shown to result from lower impurity (carbon) content, consistent with reduced (mass-dep…
View article: Design of the Lanthanum hexaboride based plasma source for the large plasma device at UCLA
Design of the Lanthanum hexaboride based plasma source for the large plasma device at UCLA Open
The Large Plasma Device (LAPD) at UCLA (University of California, Los Angeles) produces an 18 m long, magnetized, quiescent, and uniform plasma at a high repetition rate to enable studies of fundamental plasma physics. Here, we report on a…
View article: Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena in Heliophysics and Beyond
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena in Heliophysics and Beyond Open
Whitepaper #192 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: ground-based missions/projects; state of the professio…
View article: Gender Diversity in Heliophysics
Gender Diversity in Heliophysics Open
Gender diversity in the field of heliophysics is severely lacking, to the detriment of all members of the field.This status is due in part to insufficient institutional support and inclusion practices for transgender and nonbinary people a…
View article: Dynamic Formation of a Transient Jet from Arched Magnetized Laboratory Plasma
Dynamic Formation of a Transient Jet from Arched Magnetized Laboratory Plasma Open
A laboratory plasma experiment was built to explore the eruptive behavior of arched magnetized plasmas with dimensionless parameters relevant to the Sun’s photosphere ( β ≈ 10 −3 , Lundquist number ≈10 4 , plasma radius/ion gyroradius ≈20,…
View article: Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes
Measured Reduction in Alfvén Wave Energy Propagating through Longitudinal Gradients Scaled to Match Solar Coronal Holes Open
We have explored the effectiveness of a longitudinal gradient in Alfv\'en speed in reducing the energy of propagating Alfv\'en waves under conditions scaled to match solar coronal holes. The experiments were conducted in the Large Plasma D…
View article: Reduction in RF sheath rectification with insulating antenna enclosure walls
Reduction in RF sheath rectification with insulating antenna enclosure walls Open
Radiofrequency (RF) sheath rectification is one of the most prominent deleterious effects associated with ion cyclotron range of frequencies (ICRF) heating in fusion plasmas. RF sheaths and associated effects, such as impurity generation a…
View article: Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD
Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD Open
In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power to show experimentally that turbulent density fluctuations decrease with decreasing density gradient…
View article: Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD
Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD Open
In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power to show experimentally that turbulent density fluctuations decrease with decreasing density gradient…
View article: Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD
Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD Open
In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power to show experimentally that turbulent density fluctuations decrease with decreasing density gradient…
View article: Evolution of an arched magnetized laboratory plasma in a sheared magnetic field
Evolution of an arched magnetized laboratory plasma in a sheared magnetic field Open
Arched magnetized structures are a common occurrence in space and laboratory plasmas. Results from a laboratory experiment on spatio-temporal evolution of an arched magnetized plasma ( $\beta \approx 10^{-3}$ , Lundquist number $\approx 10…
View article: Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations
Stabilization of Alfvén Eigenmodes in DIII-D via Controlled Energetic Ion Density Ramp and Validation of Theory and Simulations Open
Fast-ion driven Alfvén waves with frequency close to the ion cyclotron frequency (f=0.58f_{ci}) excited by energetic ions from a neutral beam are stabilized via a controlled energetic ion density ramp for the first time in a fusion researc…
View article: Study of the Design and Assembly of a High Harmonic Fast Wave Antenna for an LAPD
Study of the Design and Assembly of a High Harmonic Fast Wave Antenna for an LAPD Open
The simulation survey of TAE Technologies has demonstrated that high harmonic fast wave (HHFW) heating is a promising method for core electron heating of FRC plasma. This study mainly describes the HHFW antenna mechanical design and assemb…
View article: Propagation of shear Alfvén waves in a two-ion plasma and application as a diagnostic for the ion density ratio
Propagation of shear Alfvén waves in a two-ion plasma and application as a diagnostic for the ion density ratio Open
In this paper, we propose an efficient diagnostic technique for determining spatially resolved measurements of the ion density ratio in a magnetized two-ion species plasma. Shear Alfvén waves were injected into a mixed helium–neon plasma u…
View article: Powering the Future: Fusion & Plasmas
Powering the Future: Fusion & Plasmas Open
This report provides a decade-long vision for the field of fusion energy and plasma science and presents a path to a promising future of new scientific discoveries, industrial applications, and, ultimately, the delivery of fusion energy. W…