Articles tagged with Plasma
Physicist Fatima Ebrahimi has used advanced models to simulate the cyclic behavior of edge-localized modes (ELMs), a type of plasma instability. She found that ELMs can form when a steep gradient of current exists at the plasma edge, and these instabilities can extinguish themselves by disrupting their own source.
Researchers have discovered a method to quickly shut down instabilities in fusion devices by injecting highly energetic particles, which can cause fusion reactions to fizzle out. This technique could prove useful for the international fusion facility ITER and demonstrate the ability to confine a burning plasma.
Researchers at PPPL successfully demonstrated a hot plasma edge in a fusion facility by coating tokamak walls with lithium. The findings show that high-edge temperatures and constant temperature profiles can be achieved, which is crucial for improving plasma performance and efficiency.
A new study by Huazhong University of Science and Technology finds that maximizing energy density within the capillary chamber yields the longest plasma jet. Varying capillary dimensions, cathode diameter, and cathode tip length are key factors in achieving optimal performance.
The US-China collaboration has made excellent progress in using lithium to control ultra-hot plasma in fusion reactions. The use of lithium powder, granules, and liquid form has shown promising results in eliminating instabilities and improving energy confinement.
A new study uses a hydrodynamic model to predict specific patterns in hadrons' angular distribution, shedding light on the structure and dynamics of quark-gluon plasmas. The results suggest that the plasma is not a gas but a liquid with extremely low viscosity.
Researchers found that lithium oxide retains hydrogen isotopes like pure lithium, improving plasma performance in fusion devices. The study suggests that high-purity lithium may not be necessary for optimal results.
Physicists at Princeton Plasma Physics Laboratory have developed a new computer model of plasma stability in tokamaks, which could help scientists predict and avoid disruptions. The new model simplifies the physics involved and predicts conditions that can contain high-pressure plasmas.
Researchers at PPPL and General Atomics simulated a self-organized flow of superhot plasma that fuels fusion reactions. The findings show that sufficient heating can drive instabilities leading to plasma rotation, which may be used to improve fusion device performance. High-energy beams traditionally injected into the plasma are replac...
Researchers from Pohang University of Science and Technology have discovered solitary perturbations (SP) structures that correlate with pedestal collapse in magnetized toroidal plasma. This finding provides new insights into the mechanisms behind reliable nuclear fusion.
Physicists have developed a new feedback controller to control fusion plasma energy and rotation. The algorithm uses sensors, algorithms, and actuators to modify the plasma's rotation profile and stored energy.
Researchers have discovered a key link between plasma flow and turbulent transport in toroidal fusion plasmas. This understanding has led to improved confinement regimes and reduced the prospects of fusion.
Researchers discovered a new discharge phenomenon, apokamp, occurring off the plasma arc in air at normal atmospheric pressure. The apokamp consists of ionisation waves - plasma bullets - moving with high velocity and may help explain blue jet phenomenon identified in 1994.
Researchers at Nagoya University developed a cold plasma-activated Ringer's solution that exhibits anti-tumor effects, attributed to the lactate component. The solution triggers cell death through increased intracellular hydrogen peroxide levels, suggesting a potential specific tumor therapy.
A team of researchers at UNIST has discovered the underlying physics of suppressing ELMs using magnetic perturbation. The study, published in Physical Review Letters, confirms that ELMs can be weakened by losing energy through interaction with turbulence induced by MP.
Researchers have developed a novel liquid metal shower divertor system that can withstand extremely high heat loads and efficiently evacuate plasma as neutral gases. The new design features a fine jet stream of liquid metal, which forms a strong wall to block plasma and facilitate effective evacuation.
Researchers developed a hybrid simulation program to investigate plasma oscillation and high-energy particle interaction. The program accurately reproduces experimental data, significantly improving the prediction accuracy of high-energy alpha particle distribution in fusion reactor core plasma.
Scientists observe localized plasma deformation, known as a 'tongue', in the LHD, confirming Artsimovich's prediction. The discovery offers insights into maintaining high-temperature and high-density plasmas for fusion research.
Physicists at PPPL have developed a real-time velocity diagnostic that measures plasma velocity in four locations within the National Spherical Torus Experiment-Upgrade. This device enables rapid calculations of how the velocity profile of ions evolves over time, which is crucial for optimizing plasma stability and fusion reactions.
Researchers at PPPL found that mean flow energy is never more than 1% of turbulent energy in H-mode, ruling out the predator-prey model. This result deepens the mystery of H-mode, but may refocus efforts on other contenders for understanding its physics.
Researchers at General Atomics have developed a new tool for controlling fusion plasmas, allowing for separate and continuous specification of power and torque. This breakthrough has the potential to improve magnetic fusion in machines worldwide.
Scientists at DIII-D National Fusion Facility have successfully reproduced radiation patterns in simulations, providing a breakthrough in fusion research. By eliminating molecular physics and accurately accounting for divertor plasma parameters, researchers have made significant progress towards designing radiating exhaust solutions.
The Wendelstein 7-X (W7-X) experiment in Germany has achieved impressive initial plasma results, pushing the boundaries of magnetic confinement. The device uses a unique twist design to optimize plasma confinement on both individual-particle and macroscopic scales.
Researchers have successfully simulated and observed the formation of plasmoids in a tokamak chamber, enabling plasma startup without solenoids. This breakthrough enables future commercial fusion power plants to operate more efficiently.
Researchers have created a 'stability map' to track fusion plasma rotation and collisionality in real-time. This allows for the detection of potential instability and control over the plasma, potentially avoiding disruption of fusion reactions.
Researchers presented initial results from the upgraded NSTX-U facility, doubling magnetic field strength and plasma current. Key findings include surpassing predecessor's maximum magnetic field strength and reducing turbulence through heating power.
A three-year, $3.3 million collaboration will study methods of predicting and avoiding disruptions on KSTAR, a long-pulse tokamak. The research aims to develop techniques for characterizing, forecasting, and avoiding events that can halt fusion reactions and damage tokamaks.
Researchers propose spherical tokamaks as a design for future fusion devices, offering a compact and low-cost solution for harnessing fusion energy. The upgraded NSTX-U and MAST facilities will provide crucial data for developing commercial fusion plants.
Researchers from PPPL found that applying magnetic fields can control Alfvén waves and reduce fast-ion escape, leading to higher temperatures and more efficient fusion processes. This breakthrough could help improve tokamak performance.
The PPPL will optimize lithium delivery systems for long-pulse plasmas on the Experimental Advanced Superconducting Tokamak (EAST) in China. The goal is to protect plasma-facing components and prevent impurities from halting fusion reactions.
A Princeton graduate student has developed a program that helps stabilize fusion plasmas, reducing instabilities that decrease tokamak efficiency. The new method uses feedback from sensors for real-time control of plasma rotation and fuels fusion reactions.
The study proposes a technique to increase the number of electrons trapped in the wake of the laser pulse, improving beam quality. This could lead to better technology for future accelerators and bring high energy physics experiments to more labs and universities.
Researchers at PPPL gained insights into how turbulence affects heat leakage in fusion plasmas, finding a steep density gradient reduces electron turbulence and heat loss. This could lead to more efficient fusion reactors like ITER, reducing heat leakage.
The team demonstrated that a laser pulse can accelerate an electron beam and couple it to a second laser plasma accelerator, achieving higher energy. The solution used two different kinds of LPA, including a discharge capillary and a jet of supersonic gas, and developed a disposable mirror system for staging.
Scientists use real-time observations and computer simulations to analyze the solar corona's dynamic system. The sun's magnetic field drives space weather on Earth and affects interplanetary radiation. Understanding its structure is crucial for studying space throughout the solar system.
Researchers at DOE's Princeton Plasma Physics Laboratory have modeled new sources of turbulence in spherical tokamaks, a potential game-changer for fusion energy. The findings suggest that keeping non-uniform plasma flows within an optimized level and reducing trapped electron collisions could improve plasma confinement.
Researchers at National Institute for Fusion Science have discovered a new confinement state inside a magnetic island, essential for improving fusion reactor plasma confinement. This breakthrough was achieved through the 'momentary heating propagation method' and has implications for future fusion research.
A US-China fusion research team has made a significant breakthrough by moving plasma closer to the wall, increasing power and efficiency of magnetic fusion energy. This achievement paves the way for future development of tokamaks like ITER, which is currently under construction in France.
Researchers are exploring plasma-based treatments for fungal infections, as well as using plasmas to extend the shelf life of seafood. Additionally, advancements in plasma propulsion technology are being made for small spacecraft, offering potential solutions for satellite thrusters.
Researchers at Vanderbilt University have successfully created tiny drops of quark-gluon plasma using the Large Hadron Collider, exhibiting coherent behavior and flowing properties similar to those of liquids. The findings shed new light on the formation process of these primordial droplets.
Researchers created the smallest quark-gluon plasma in proton-lead collisions, contradicting previous expectations. This discovery sheds new light on high-energy physics and helps define the conditions needed for quark-gluon plasma existence.
Researchers at SLAC National Accelerator Laboratory have developed a new method to accelerate positrons using plasma wakefield acceleration. This breakthrough could lead to the construction of smaller and more efficient electron-positron colliders, which would help unravel the fundamental building blocks of nature.
Researchers at Tata Institute of Fundamental Research created bacteria to emit intense hard x-ray radiation. By using nanostructured bacterial cells and silver nanoparticles, they achieved a 10,000-fold increase in x-ray emission compared to plain glass slides.
A new approach has been proposed to communicate with spacecraft as they re-enter the atmosphere, utilizing a matched layer in the antenna to replicate special conditions that enhance signal transmission. This method could also be applied to other hypersonic vehicles, such as military planes and ballistic missiles.
The STAR collaboration has observed a 'chiral magnetic wave' rippling through the quark-gluon plasma created at RHIC's energetic particle smashups. This finding provides evidence for the chiral magnetic effect, a quantum phenomenon causing electric charge separation along the axis of a magnetic field.
Physicists at Princeton Plasma Physics Laboratory have simulated the formation of plasmoids in hot plasma gas that fuels fusion reactions. The discovery could lead to more efficient creation and maintenance of plasma through transient Coaxial Helicity Injection, simplifying tokamak design.
The study found that axial momentum loss occurs in the helicon plasma thruster due to internal electric fields. This loss significantly affects propulsive performance. The findings suggest more detailed understanding of plasma dynamics is needed for further development of high-power, electrodeless propulsion devices.
Delgado-Aparicio's research aims to eliminate impurities that cool plasma and halt fusion reactions, crucial for ITER and NSTX-U experiments. His $2.6M grant will fund development of a complex diagnostic tool to analyze impurity reactions with plasma.
Researchers developed new plasma models applicable to medicine using data on oxygen ion transport and interaction with water molecules. These models account for how discharges are created in water vapour, enabling the development of novel therapeutic treatments for wound healing and dermatology.
Researchers analyze particle jets from lead ion collisions to understand quark-gluon plasma properties. The study reveals that high-energy jets are suppressed, contradicting some theoretical models.
Researchers at the DIII-D tokamak have demonstrated that lithium injections can transiently double temperature and pressure at the plasma edge, delaying instabilities. The results show a 60% increase in total energy-confinement time and improved performance of the plasma.
Researchers at Penn State will focus on developing plasma photonic crystals and plasma-embedded metamaterials that operate in the terahertz range, enabling applications such as antennas with beam steering and filter devices. The project aims to replace traditional metallic split-ring resonators with low-loss dielectric resonators.
Sprites form at plasma irregularities in the lower ionosphere, a phenomenon that can be useful for remote sensing of the region. The researchers used high-speed videos and fluid models to study sprite dynamics and determine the origin of the irregularities.
Researchers at the University of Utah created the smallest plasma transistors that can operate in extreme environments, including nuclear reactors. These devices have the potential to enable innovative applications such as medical X-ray imaging and real-time air quality monitoring, and could be used to control robots in nuclear reactors.
Researchers have discovered that introducing plasma to combustion reactions can sustain flames in conditions where they would normally be extinguished. This technology could significantly improve the efficiency of military jets, passenger planes, and unmanned drones by conserving fuel and extending flight times.
Recent experiments have found that lithium bound to carbon walls in fusion devices plays a key role in improving plasma performance. The combination of lithium, oxygen, and carbon improves deuterium retention and reduces recycling, leading to enhanced energy confinement and reduced edge plasma instabilities.
A joint experiment between Chinese and American scientists successfully demonstrated a tokamak fusion reactor's ability to maintain high fusion performance for extended periods. The experiment exploited plasma self-generations of electrical current, reducing the need for external coils and increasing cost-effectiveness.
Researchers have successfully shielded fusion facility walls using lithium vapors, extending protection to 10 times longer than expected. The breakthrough could alleviate concerns about plasma contamination and aborting fusion reactions in future devices.
Researchers at the National Spherical Torus Experiment have successfully created giant plasma bubbles using a method called Coaxial Helicity Injection, which harnesses the power of magnetic reconnection. The simulation results shed light on the complex mechanisms behind this phenomenon, revealing how forces and currents interact to gen...
Researchers discovered that rotating plasma during disruptions can spread energy around the vessel, reducing heat load. The Alcator C-Mod team found spontaneous rotation in tokamaks, while DIII-D tested theory using 3D magnetic fields to control instability direction.