A Reflection Technique for Plasma‐Density Measurement

1968 ◽  
Vol 39 (7) ◽  
pp. 3349-3354 ◽  
Author(s):  
R. L. Bruce ◽  
F. W. Crawford ◽  
R. S. Harp
2019 ◽  
Vol 21 (6) ◽  
pp. 064007
Author(s):  
H J YEOM ◽  
D H CHOI ◽  
Y S LEE ◽  
J H KIM ◽  
D J SEONG ◽  
...  

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

2007 ◽  
Vol 78 (11) ◽  
pp. 113504 ◽  
Author(s):  
C. Deline ◽  
B. E. Gilchrist ◽  
C. Dobson ◽  
J. E. Jones ◽  
D. G. Chavers

2020 ◽  
Vol 227 ◽  
pp. 02006
Author(s):  
Eugenia Naselli ◽  
David Mascali ◽  
Claudia Caliri ◽  
Giuseppe Castro ◽  
Luigi Celona ◽  
...  

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.


2019 ◽  
Vol 61 (4) ◽  
pp. 045012 ◽  
Author(s):  
G Loisch ◽  
G Asova ◽  
P Boonpornprasert ◽  
Y Chen ◽  
J Good ◽  
...  

1988 ◽  
Vol 117 ◽  
Author(s):  
David I. C. Pearson ◽  
G. A. Campbell ◽  
C. W. Domier ◽  
P. C. Efthimion

AbstractA low-cost heterodyne microwave interferometer system capable of measuring and/or controlling the plasma density over a dynamic range covering two orders of magnitude is demonstrated. The microwave frequency is chosen to match the size and density of plasma to be monitored. Large amplitude, high frequency fluctuations can be quantitatively followed and the longer-time-scale density can be held constant over hours of operation, for example during an inline production process to maintain uniformity and stoichiometry of films. A linear relationship is shown between plasma density and discharge current in a specific plasma device. This simple relationship makes control of the plasma straightforward using the interferometer as a density monitor. Other plasma processes could equally well benefit from such density control capability. By combining the interferometer measurement with diagnostics such as probes or optical spectroscopy, the total density profile and the constituent proportions of the various species in the plasma could be determined.


2010 ◽  
Vol 85 (3-4) ◽  
pp. 328-331 ◽  
Author(s):  
L. Esteban ◽  
M. Sánchez ◽  
J.A. López ◽  
O. Nieto-Taladriz ◽  
J. Sánchez

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