Measurements of Plasma Potential and Electron Temperature Fluctuation in a Low-Temperature Magnetized Plasma

2001 ◽  
Vol 41 (5) ◽  
pp. 449-454 ◽  
Author(s):  
S.V. Ratynskaia ◽  
K. Rypdal ◽  
V.I. Demidov
Keyword(s):  
Low Temperature ◽  
Electron Temperature ◽  
Temperature Fluctuation ◽  
Plasma Potential ◽  
Magnetized Plasma

scholarly journals Drift-Alfvén fluctuations and transport in multiple interacting magnetized electron temperature filaments

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
R. D. Sydora ◽  
S. Karbashewski ◽  
B. Van Compernolle ◽  
M. J. Poulos ◽  
J. Loughran
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
Current Model ◽  
Outer Region ◽  
Wave Pattern ◽  
Plasma Potential ◽  
Magnetized Plasma ◽  
Low Energy Electrons ◽  
Convective Pattern ◽  
Set Up

The results of a basic electron heat transport experiment using multiple localized heat sources in close proximity and embedded in a large magnetized plasma are presented. The set-up consists of three biased probe-mounted crystal cathodes, arranged in a triangular spatial pattern, that inject low energy electrons along a strong magnetic field into a pre-existing, cold afterglow plasma, forming electron temperature filaments. When the three sources are activated and placed within a few collisionless electron skin depths of each other, a non-azimuthally symmetric wave pattern emerges due to interference of the drift-Alfvén modes that form on each filament’s temperature gradient. Enhanced cross-field transport from chaotic ( $\boldsymbol{E}\times \boldsymbol{B}$ , where $\boldsymbol{E}$ is the electric field and $\boldsymbol{B}$ the magnetic field) mixing rapidly relaxes the gradients in the inner triangular region of the filaments and leads to growth of a global nonlinear drift-Alfvén mode that is driven by the thermal gradient in the outer region of the triangle. Azimuthal flow shear arising from the emissive cathode sources modifies the linear eigenmode stability and convective pattern. A steady-current model with emissive sheath boundary predicts the plasma potential and shear flow contribution from the sources.

Comparative measurements of plasma potential with ball-pen and Langmuir probe in low-temperature magnetized plasma

2015 ◽  
Vol 22 (3) ◽  
pp. 033516 ◽  
Author(s):  
M. Zanáška ◽  
J. Adámek ◽  
M. Peterka ◽  
P. Kudrna ◽  
M. Tichý
Keyword(s):  
Low Temperature ◽  
Langmuir Probe ◽  
Plasma Potential ◽  
Magnetized Plasma

scholarly journals Some experiments with the tunnel probe in a low temperature magnetized plasma

2018 ◽  
Vol 958 ◽  
pp. 012007
Author(s):  
J. Kovačič ◽  
T. Gyergyek ◽  
B. Kavaš ◽  
M. Vodnik ◽  
J. Kavčič ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnetized Plasma

scholarly journals Effect of the gas puff location on the divertor plasma properties in COMPASS tokamak

2020 ◽  
Vol 1492 (1) ◽  
pp. 012003
Author(s):  
M Dimitrova ◽  
M Tomes ◽  
Tsv Popov ◽  
R Dejarnac ◽  
J Stockel ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Vacuum Chamber ◽  
Plasma Potential ◽  
Saturation Current ◽  
Langmuir Probes ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Low Field ◽  
Saturation Current Density ◽  
Deuterium Gas

Abstract Langmuir probes are used to study the plasma parameters in the divertor during deuterium gas puff injection on the high- (HFS) or low-field sides (LFS). The probe data were processed to evaluate the plasma potential and the electron temperatures and densities. A difference was found in the plasma parameters depending on the gas puff location. In the case of a gas puff on the LFS, the plasma parameters changed vastly, mainly in the inner divertor – the plasma potential, the ion saturation-current density and the electron temperature dropped. After the gas puff, the electron temperature changed from 10-15 eV down to within the 5-9 eV range. As a result, the parallel heat-flux density decreased. At the same time, in the outer divertor the plasma parameters remained the same. We thus concluded that using a gas puff on the LFS will facilitate reaching a detachment regime by increasing the density of puffed neutrals. When the deuterium gas puff was on the HFS, the plasma parameters in the divertor region remained almost the same before and during the puff. The electron temperature decreased with just few eV as a result of the increased amount of gas in the vacuum chamber.

scholarly journals Low Temperature Dielectronic Recombination Coefficients for Ions of C, N and O

1983 ◽  
Vol 103 ◽  
pp. 513-514
Author(s):  
H. Nussbaumer ◽  
P.J. Storey
Keyword(s):  
Low Temperature ◽  
Electron Temperature ◽  
General Formula ◽  
Dielectronic Recombination ◽  
Simple Function ◽  
Recombination Coefficient ◽  
Temperature Range

Dielectronic recombination coefficients have been calculated for some ions of C, N and O by Storey (1981, Mon. Not. R. astr. Soc., 195, 27P). Using the same approach, we have extended those calculations to all other ions of C, N and O for which a dielectronic contribution to the total recombination coefficient might be expected at nebular temperatures. Recombination coefficients have been calculated in the temperature range from 5000 K up to the temperature at which the Burgess general formula becomes valid. The total dielectronic recombination coefficients are fitted to a simple function of the electron temperature.

Electron temperature fluctuation measurements and techniques in the DIII-D tokamak

1997 ◽  
Vol 68 (1) ◽  
pp. 484-487 ◽  
Author(s):  
C. L. Rettig ◽  
W. A. Peebles ◽  
J. Lohr ◽  
M. E. Austin
Keyword(s):  
Electron Temperature ◽  
Temperature Fluctuation

A magnetized plasma with very low electron temperature

2012 ◽  
Vol 21 (5) ◽  
pp. 055025 ◽  
Author(s):  
Shannon Dickson ◽  
Devin Konecny ◽  
Tyler Nickerson ◽  
Scott Robertson
Keyword(s):  
Electron Temperature ◽  
Magnetized Plasma

A new MHD model for Io's and Europa's plasma interaction

2020 ◽  
Author(s):  
Aljona Blöcker ◽  
Lorenz Roth ◽  
Nickolay Ivchenko ◽  
Emmanuel Chané ◽  
Ronny Keppens
Keyword(s):  
Heat Flux ◽  
Electron Temperature ◽  
Inelastic Collisions ◽  
Magnetized Plasma ◽  
Plasma Interaction ◽  
Complex Plasma ◽  
Electron Heat ◽  
Self Consistent ◽  
Physical Effects ◽  
Auroral Emissions

<p>Io and Europa are embedded in Jupiter’s magnetosphere and the moons’ surfaces and atmospheres interact with the surrounding moving magnetized plasma forming a complex plasma interaction. The interaction scenarios for both moons are characterized by inhomogeneities in the atmospheres from local outgassing. These inhomogeneities affect the electromagnetic environment but can also lead to localized features in the moons' auroral emissions. The moons’ aurora in turn is sensitive to the energy or temperature of the exciting electrons in the plasma. To simulate the interaction scenarios including atmospheric inhomogeneities and aurora generation, we expand the magnetohydrodynamic code MPI-AMRVAC by implementing a self-consistent description of the electron temperature and the electron density where the cooling by inelastic collisions between the magnetospheric electrons and the atmosphere, and the electron heat flux from the magnetospheric plasma to the moons’ ionosphere are included. Furthermore, the numerical schemes of MPI-AMRVAC are able to handle discontinuities that arise from the atmospheric inhomogeneities. Here, we demonstrate the implementation of the physical effects and first modeling results of Io’s and Europa’s plasma interaction with the advanced MHD code.</p>

Sustenance of inhomogeneous electron temperature in a magnetized plasma column

2015 ◽  
Vol 22 (9) ◽  
pp. 092107 ◽  
Author(s):  
S. K. Karkari ◽  
S. K. Mishra ◽  
P. K. Kaw
Keyword(s):  
Electron Temperature ◽  
Plasma Column ◽  
Magnetized Plasma
Sign in / Sign up

Export Citation Format

Share Document