"Energy spectra of tailored particle beams from trapped single-component plasmas" Physics of Plasmas 16 , 057105 (2009) T. R. Weber, J. R. Danielson, and C. M. Surko (PDF)
... To extract a beam from a trapped plasma, VC at one end of the plasma is lowered to a value VE for about 15 s. This process is illustrated schematically in Fig. 3共a兲 where the potential at r = 0 is shown during an extraction. The extraction time is chosen to be sufficiently long so that particles wi ...
... To extract a beam from a trapped plasma, VC at one end of the plasma is lowered to a value VE for about 15 s. This process is illustrated schematically in Fig. 3共a兲 where the potential at r = 0 is shown during an extraction. The extraction time is chosen to be sufficiently long so that particles wi ...
"Radial Compression and Inward Transport of Positron Plasmas Using a Rotating Electric Field" Phys. Plasmas 8 (2001), pp.1879-85 R. G. Greaves and C. M. Surko (PDF)
... The availability of efficient low-energy positron sources are important in areas as diverse as atomic physics,1 materials and surface science,2,3 plasma physics,4 mass spectrometry,5 and astrophysical simulations.6 The development of techniques to accumulate positrons in Penning traps has extended m ...
... The availability of efficient low-energy positron sources are important in areas as diverse as atomic physics,1 materials and surface science,2,3 plasma physics,4 mass spectrometry,5 and astrophysical simulations.6 The development of techniques to accumulate positrons in Penning traps has extended m ...
Generation of radial electric field in the process of full... by kinetic kink mode Taro Matsumoto , Shinji Tokuda
... of the collisionless electron skin depth. Naitou et al. performed a nonlinear gyro-kinetic particle simulation of the m = 1 mode in a cylindrical geometry with a uniform plasma pressure (Naitou et al., 1995, 1996). They showed that the magnetic reconnection is triggered by the electron inertia in a ...
... of the collisionless electron skin depth. Naitou et al. performed a nonlinear gyro-kinetic particle simulation of the m = 1 mode in a cylindrical geometry with a uniform plasma pressure (Naitou et al., 1995, 1996). They showed that the magnetic reconnection is triggered by the electron inertia in a ...
- Institute of Physics Belgrade Roundcube Webmail
... average velocity, and relative values of elastic collision and attachment rates (not associated with any vertical axis; just showing the profile). ...
... average velocity, and relative values of elastic collision and attachment rates (not associated with any vertical axis; just showing the profile). ...
Observations of Synchrotron Radiation from Electrons Accelerated
... information about the dynamics of the laser-plasma acceleration. For mildly relativistic pulses, the x-ray radiation indicates a small oscillation parameter, which correlates with non-Maxwellian electron spectra and modulated transmitted optical spectra, all indicative of wakefield acceleration of t ...
... information about the dynamics of the laser-plasma acceleration. For mildly relativistic pulses, the x-ray radiation indicates a small oscillation parameter, which correlates with non-Maxwellian electron spectra and modulated transmitted optical spectra, all indicative of wakefield acceleration of t ...
770_1.PDF
... wavelengths in ~44-A range can be transported to the detection system with no significant losses. Due to stray interference effects related to the external green antireflection coated surfaces, the etalon also reflects -10% of the stray light. For this reason, a 3-pass geometry has been employed to ...
... wavelengths in ~44-A range can be transported to the detection system with no significant losses. Due to stray interference effects related to the external green antireflection coated surfaces, the etalon also reflects -10% of the stray light. For this reason, a 3-pass geometry has been employed to ...
Document
... At low and intermediate pressures, the electric field is positive on the surface, indicating that the multipactor discharge can be sustained. At high pressures, the electric field is negative on the surface. The energy of electrons impacting the surface is low enough so that the secondary electr ...
... At low and intermediate pressures, the electric field is positive on the surface, indicating that the multipactor discharge can be sustained. At high pressures, the electric field is negative on the surface. The energy of electrons impacting the surface is low enough so that the secondary electr ...
Simulated expansion of an ultra-cold, neutral plasma
... Coulomb coupling parameter is especially important because if it is roughly 1 or larger then the potential energy dominates and highly correlated motion between charged particles is expected. The experiments can tune the plasma so that ⌫ e Ⰷ1. It is precisely when the Coulomb coupling parameter was ...
... Coulomb coupling parameter is especially important because if it is roughly 1 or larger then the potential energy dominates and highly correlated motion between charged particles is expected. The experiments can tune the plasma so that ⌫ e Ⰷ1. It is precisely when the Coulomb coupling parameter was ...
Direct comparison of experimental and theoretical results on the
... In recent experiments [16], detailed measurements were performed on the discharge modes of a helicon source excited by double m = 0 antenna at a frequency of 7 MHz and high Ar pressures up to 51 mTorr. Depending on the electron density and temperature, the νe /ω ratio could reach the value of ten an ...
... In recent experiments [16], detailed measurements were performed on the discharge modes of a helicon source excited by double m = 0 antenna at a frequency of 7 MHz and high Ar pressures up to 51 mTorr. Depending on the electron density and temperature, the νe /ω ratio could reach the value of ten an ...
Experimental Evidence for a Reduction in Electron Thermal
... fields and stochastic transport. In astrophysics, the turbulent motion of the plasma, for example, in galaxy clusters, can generate tangled magnetic fields on vast scales. In their seminal work on the subject, Rechester and Rosenbluth suggest a method for quantifying the stochastic diffusion of the ...
... fields and stochastic transport. In astrophysics, the turbulent motion of the plasma, for example, in galaxy clusters, can generate tangled magnetic fields on vast scales. In their seminal work on the subject, Rechester and Rosenbluth suggest a method for quantifying the stochastic diffusion of the ...
"Radial compression and torque-balanced steady states of single-component plasmas in Penning-Malmberg traps" Physics of Plasmas 13 (2006), 055706 J. R. Danielson and C. M. Surko (PDF)
... 关共1 / T兲dT / dt ⬃ 1.0 s−1兴 is much slower than the cyclotron cooling rate. The work described below focuses on the evolution of the plasma to high-density steady states, the nature of these states, and the limits that can be achieved. In general, when the plasma reaches such a state, the temperature ...
... 关共1 / T兲dT / dt ⬃ 1.0 s−1兴 is much slower than the cyclotron cooling rate. The work described below focuses on the evolution of the plasma to high-density steady states, the nature of these states, and the limits that can be achieved. In general, when the plasma reaches such a state, the temperature ...
Physics of fully-loaded laser-plasma accelerators - HAL
... of injection, if these electrons are not trapped, no other electron will be trapped. Because the phase velocity of the wakefield is higher than the velocity of light in the upward density gradient, the earliest ionized electrons cannot be trapped in the first plasma buckets. They slip across several ...
... of injection, if these electrons are not trapped, no other electron will be trapped. Because the phase velocity of the wakefield is higher than the velocity of light in the upward density gradient, the earliest ionized electrons cannot be trapped in the first plasma buckets. They slip across several ...
Performances of the Beam Generated by Metal
... The patterned electrode has been grounded, and the rear electrode has been supplied by trigger pulse Utr. of both positive and negative polarity. Before the trigger pulse to be applied the gun output current was null in the range of the electric field strength from minimum to 40 MV/m. Within the app ...
... The patterned electrode has been grounded, and the rear electrode has been supplied by trigger pulse Utr. of both positive and negative polarity. Before the trigger pulse to be applied the gun output current was null in the range of the electric field strength from minimum to 40 MV/m. Within the app ...
Beyond Ideal MHD - Harvard-Smithsonian Center for Astrophysics
... This results in a net effective thermal diffusion and may be important in galaxy clusters ...
... This results in a net effective thermal diffusion and may be important in galaxy clusters ...
Title Three-dimensional diagnostics of dynamic behaviors of excited
... for the low-voltage and high-voltage operation modes, respectively, corresponding to the conditions for the emission measurement. The regions within about 25- m distance from the electrode and barrier rib surfaces could not be accessed by the probing laser beam. Therefore, those regions are not show ...
... for the low-voltage and high-voltage operation modes, respectively, corresponding to the conditions for the emission measurement. The regions within about 25- m distance from the electrode and barrier rib surfaces could not be accessed by the probing laser beam. Therefore, those regions are not show ...
I A two-region model of a radiofrequency I low
... In this paper we present a two-region model of a radiofrequency low-pressure, high-density plasma source. A chlorine discharge sustained in a TCPnCP source is considered as a case study. However, the model can be applied to other gases, including mixedgas plasmas, as well as other HDP sources. For e ...
... In this paper we present a two-region model of a radiofrequency low-pressure, high-density plasma source. A chlorine discharge sustained in a TCPnCP source is considered as a case study. However, the model can be applied to other gases, including mixedgas plasmas, as well as other HDP sources. For e ...
Space charge and plasma effects in zero kinetic energy (ZEKE
... self-consistent electric fields. The electrons and ions are assumed to have characteristic temperatures, T e and T i , which are related to their average random thermal velocity. Although in these simulations the velocity distributions are Maxwellian, this is not a necessary condition. The component ...
... self-consistent electric fields. The electrons and ions are assumed to have characteristic temperatures, T e and T i , which are related to their average random thermal velocity. Although in these simulations the velocity distributions are Maxwellian, this is not a necessary condition. The component ...
PDP-11 Formation of Closed Flux Surfaces in Reconnection Current
... restricted room in the ST central region. Many kinds of CS-free start-up methods have been studied in various experimental devices [1]. As one of candidates for CS-free start-up methods, combination of torus discharge by using external poloidal field (PF) coils and axial merging technique has been i ...
... restricted room in the ST central region. Many kinds of CS-free start-up methods have been studied in various experimental devices [1]. As one of candidates for CS-free start-up methods, combination of torus discharge by using external poloidal field (PF) coils and axial merging technique has been i ...
remote sensing as a tool of seismic hazards monitoring
... turbulent motion of plasma layers and the generation of small-scale plasma inhomogeneities (with inhomogeneity scale about tens meters and more and plasma density variations δ n p / n p ~ 0.01 ). ...
... turbulent motion of plasma layers and the generation of small-scale plasma inhomogeneities (with inhomogeneity scale about tens meters and more and plasma density variations δ n p / n p ~ 0.01 ). ...
A novel mechanism for electron-cyclotron maser
... Another important instability driven by a fast electron beam is the Langmuir wave (LW) instability, which usually has a much faster growth rate than that of the AW instability. However, this does not imply that the LW instability is more important than the AW instability. The propagation of the LW c ...
... Another important instability driven by a fast electron beam is the Langmuir wave (LW) instability, which usually has a much faster growth rate than that of the AW instability. However, this does not imply that the LW instability is more important than the AW instability. The propagation of the LW c ...
The Magnetosphere and Plasmasphere
... • When B has a minimum at some reference point so along each magnetic field line encircled (or “enhelixed”) by a particle, the collisionless parallel motion will be that of a particle in an effective potential well (remember, though, that the magnetic potential depends on the constant m, which is no ...
... • When B has a minimum at some reference point so along each magnetic field line encircled (or “enhelixed”) by a particle, the collisionless parallel motion will be that of a particle in an effective potential well (remember, though, that the magnetic potential depends on the constant m, which is no ...
Three-scale structure of diffusion region of magnetic reconnection in
... events with plasma containing hot and cold ion components of comparable densities [Andre and Cully, 2012]. It was suggested that such ion distribution alters properties of the magnetic reconnection regions at the magnetopause [Toledo‐Redondo et. al., 2016]. Motivated by these recent findings, we per ...
... events with plasma containing hot and cold ion components of comparable densities [Andre and Cully, 2012]. It was suggested that such ion distribution alters properties of the magnetic reconnection regions at the magnetopause [Toledo‐Redondo et. al., 2016]. Motivated by these recent findings, we per ...
Plasma Process 11 IC..
... Class notes for EE6318/Phys 6383 – Spring 2001 This document is for instructional use only and may not be copied or distributed outside of EE6318/Phys 6383 ...
... Class notes for EE6318/Phys 6383 – Spring 2001 This document is for instructional use only and may not be copied or distributed outside of EE6318/Phys 6383 ...
Electrodynamic Properties of Metals and Superconductors
... respect to the positive ion background. This creates surface charges σ = nde and thus an electric field E = 4πnde (cgs units) If the electrons in a plasma are displaced from a uniform background of ions, electric fields will be built up in such a direction as to restore the neutrality of the plasma ...
... respect to the positive ion background. This creates surface charges σ = nde and thus an electric field E = 4πnde (cgs units) If the electrons in a plasma are displaced from a uniform background of ions, electric fields will be built up in such a direction as to restore the neutrality of the plasma ...
Plasma Vortices in Planetary Wakes
... sponse in their motion rather than to trajectories directed by the magnetic field. The overall manner in which the solar wind responds as it interacts with the Venus iono‐ sphere is different since in the absence of an intrinsic planetary magnetization its particles reach the ionospheric plasma and, ...
... sponse in their motion rather than to trajectories directed by the magnetic field. The overall manner in which the solar wind responds as it interacts with the Venus iono‐ sphere is different since in the absence of an intrinsic planetary magnetization its particles reach the ionospheric plasma and, ...
Plasma (physics)
Plasma (from Greek πλάσμα, ""anything formed"") is one of the four fundamental states of matter, the others being solid, liquid, and gas. A plasma has properties unlike those of the other states.A plasma can be created by heating a gas or subjecting it to a strong electromagnetic field applied with a laser or microwave generator. This decreases or increases the number of electrons, creating positive or negative charged particles called ions, and is accompanied by the dissociation of molecular bonds, if present.The presence of a significant number of charge carriers makes plasma electrically conductive so that it responds strongly to electromagnetic fields. Like gas, plasma does not have a definite shape or a definite volume unless enclosed in a container. Unlike gas, under the influence of a magnetic field, it may form structures such as filaments, beams and double layers.Plasma is the most abundant form of ordinary matter in the Universe (the only matter known to exist for sure, the more abundant dark matter is hypothetical and may or may not be explained by ordinary matter), most of which is in the rarefied intergalactic regions, particularly the intracluster medium, and in stars, including the Sun. A common form of plasmas on Earth is seen in neon signs.Much of the understanding of plasmas has come from the pursuit of controlled nuclear fusion and fusion power, for which plasma physics provides the scientific basis.