The ac-coupling between a Langmuir probe and a plasma and its effect on the plasma density measurement in the afterglow

2014 ◽  
Vol 47 (7) ◽  
pp. 075201 ◽  
Author(s):  
Fei-Xiang Liu ◽  
Zhen-Bin Wang ◽  
Yi-Kang Pu
Keyword(s):  
Plasma Density ◽  
Langmuir Probe ◽  
Density Measurement

High accuracy plasma density measurement using hybrid Langmuir probe and microwave interferometer method

2007 ◽  
Vol 78 (11) ◽  
pp. 113504 ◽  
Author(s):  
C. Deline ◽  
B. E. Gilchrist ◽  
C. Dobson ◽  
J. E. Jones ◽  
D. G. Chavers
Keyword(s):  
Plasma Density ◽  
Langmuir Probe ◽  
Density Measurement ◽  
High Accuracy ◽  
Interferometer Method

scholarly journals Solar flares observed by Rosetta at comet 67P/Churyumov-Gerasimenko

2019 ◽  
Vol 630 ◽  
pp. A49 ◽  
Author(s):  
N. J. T. Edberg ◽  
F. L. Johansson ◽  
A. I. Eriksson ◽  
D. J. Andrews ◽  
R. Hajra ◽  
...  
Keyword(s):  
Plasma Density ◽  
Solar Flares ◽  
Langmuir Probe ◽  
Extreme Ultraviolet ◽  
Vantage Point ◽  
Spectral Model ◽  
Time Of Arrival ◽  
Observable Effect ◽  
Density Measurements ◽  
Comet 67P

Context. The Rosetta spacecraft made continuous measurements of the coma of comet 67P/Churyumov-Gerasimenko (67P) for more than two years. The plasma in the coma appeared very dynamic, and many factors control its variability. Aims. We wish to identify the effects of solar flares on the comet plasma and also their effect on the measurements by the Langmuir Probe Instrument (LAP). Methods. To identify the effects of flares, we proceeded from an existing flare catalog of Earth-directed solar flares, from which a new list was created that only included Rosetta-directed flares. We also used measurements of flares at Mars when at similar longitudes as Rosetta. The flare irradiance spectral model (FISM v.1) and its Mars equivalent (FISM-M) produce an extreme-ultraviolet (EUV) irradiance (10–120 nm) of the flares at 1 min resolution. LAP data and density measurements obtained with the Mutual Impedence Probe (MIP) from the time of arrival of the flares at Rosetta were examined to determine the flare effects. Results. From the vantage point of Earth, 1504 flares directed toward Rosetta occurred during the mission. In only 24 of these, that is, 1.6%, was the increase in EUV irradiance large enough to cause an observable effect in LAP data. Twenty-four Mars-directed flares were also observed in Rosetta data. The effect of the flares was to increase the photoelectron current by typically 1–5 nA. We find little evidence that the solar flares increase the plasma density, at least not above the background variability. Conclusions. Solar flares have a small effect on the photoelectron current of the LAP instrument, and they are not significant in comparison to other factors that control the plasma density in the coma. The photoelectron current can only be used for flare detection during periods of calm plasma conditions.

Plasma density measurement and downstream etching of silicon and silicon oxide in Ar/NF3 mixture remote plasma source

2019 ◽  
Vol 21 (6) ◽  
pp. 064007
Author(s):  
H J YEOM ◽  
D H CHOI ◽  
Y S LEE ◽  
J H KIM ◽  
D J SEONG ◽  
...  
Keyword(s):  
Plasma Density ◽  
Silicon Oxide ◽  
Density Measurement ◽  
Plasma Source ◽  
Remote Plasma

Edge plasma density measurement by laser blow-off method

1989 ◽  
Vol 31 (5) ◽  
pp. 693-698 ◽  
Author(s):  
J S Bakos ◽  
G Burger ◽  
I B Foldes ◽  
P E Giese ◽  
P N Ignacz ◽  
...  
Keyword(s):  
Plasma Density ◽  
Density Measurement ◽  
Edge Plasma

scholarly journals Nuclear β-decays in plasmas: how to correlate plasma density and temperature to the activity

2020 ◽  
Vol 227 ◽  
pp. 02006
Author(s):  
Eugenia Naselli ◽  
David Mascali ◽  
Claudia Caliri ◽  
Giuseppe Castro ◽  
Luigi Celona ◽  
...  
Keyword(s):  
Charge State ◽  
Plasma Density ◽  
Electron Cyclotron Resonance ◽  
Density Measurement ◽  
Charge State Distribution ◽  
State Distribution ◽  
Time Resolved ◽  
Astrophysical Interest ◽  
X Ray ◽  
Astrophysical Objects

Magnetized plasmas in compact traps may become experimental en-vironments for the investigation of nuclear beta-decays of astrophysical inter-est. In the framework of the project PANDORA (Plasmas for Astrophysics, Nuclear Decays Observation and Radiation for Archaeometry) the research ac-tivities are devoted to demonstrate the feasibility of an experiment aiming atmeasuring lifetimes of radionuclides of astrophysical interest when changing the charge state distribution of the in-plasma ions and the other plasma param- eters such as density and temperature. This contribution describes the multidi-agnostics setup now available at INFN-LNS, which allows unprecedented in-vestigations of magnetoplasmas properties in terms of density, temperature and charge state distribution (CSD). The setup includes an interfero-polarimeter for total plasma density measurement, a multi-X-ray detectors system for X-ray spectroscopy (including time resolved spectroscopy), an X-ray pin-hole camera for high-resolution 2D space resolved spectroscopy, a two-pin plasma-chamber immersed antenna for the detection of plasma radio-self-emission, and differ- ent spectrometers for the plasma-emitted visible light characterization. The setup is also suitable for other studies of astrophysical interest, such as turbulent plasma regimes dominated by the so-called Cyclotron Maser Instability, which is a typical kinetic turbulence occurring in astrophysical objects like magnetized stars, brown dwarfs, etc. A description of recent results about plasma parame- ters characterization in quiescent and turbulent Electron Cyclotron Resonance-heated plasmas will be given.

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