Helium line emission spectroscopy in recombining detached plasmas

2018 ◽  
Vol 25 (6) ◽  
pp. 063303 ◽  
Author(s):  
Shin Kajita ◽  
Kensuke Suzuki ◽  
Hirohiko Tanaka ◽  
Noriyasu Ohno
Keyword(s):  
Emission Spectroscopy ◽  
Line Emission ◽  
Helium Line

Design Considerations and Preliminary Characterizations of a Kilowatt-Plus Microwave-Induced Plasma

1988 ◽  
Vol 42 (6) ◽  
pp. 1061-1065 ◽  
Author(s):  
Kevin B. Cull ◽  
Jon W. Carnahan
Keyword(s):  
Line Emission ◽  
Helical Flow ◽  
Microwave Generator ◽  
Microwave Induced Plasma ◽  
Design Considerations ◽  
Resonator Cavity ◽  
Helium Line ◽  
Intensity Ratios ◽  
Ion Emission ◽  
Generator Output

A high-powered helium microwave-induced plasma was developed, and preliminary characterizations are presented. This kilowatt-plus microwave-induced plasma (KiP-MIP) was contained in a helical flow quartz torch. Power was transferred via waveguides from a 3.0-kW, 2.45-GHz, 120-pulses-per-second microwave generator to a waveguide-to-coaxial converter. A modified Beenakker TM010 resonator cavity was used to focus the energy. Effects of the magnitude of applied power on helium line emission intensities were studied, as well as comparisons of the temporal output of generator output and helium line emission. Introduction of gaseous halogens (Cl2, CBr4) produced intense ion emission which follows the intensity ratios commonly observed in He-MIPs.

Neutral helium line emission for edge plasma conditions

2005 ◽  
Vol 337-339 ◽  
pp. 1101-1105 ◽  
Author(s):  
F.B. Rosmej ◽  
R. Stamm ◽  
S. Fritzsche ◽  
H. Capes ◽  
M. Koubiti ◽  
...  
Keyword(s):  
Line Emission ◽  
Edge Plasma ◽  
Helium Line

Helium line emission from Be stars

1994 ◽  
Vol 420 ◽  
pp. 803 ◽  
Author(s):  
Krishna M. V. Apparao ◽  
S. P. Tarafdar
Keyword(s):  
Line Emission ◽  
Be Stars ◽  
Helium Line

scholarly journals Investigation of an Ablation-dominated Arc in a Model Chamber by Optical Emission Spectroscopy

2017 ◽  
Vol 4 (2) ◽  
pp. 153-156 ◽  
Author(s):  
R. Methling ◽  
A. Khakpour ◽  
S. Wetzeler ◽  
D. Uhrlandt
Keyword(s):  
Emission Spectroscopy ◽  
High Speed ◽  
Optical Emission Spectroscopy ◽  
Rotational Symmetry ◽  
Line Emission ◽  
Optical Emission ◽  
Ambient Air ◽  
Video Camera ◽  
Radial Temperature ◽  
Model Chamber

A switching arc in a model chamber is investigated by means of optical emission spectroscopy. Ignition wire is applied to initiate an arc of several kiloampere between tungsten−copper electrodes. Radiation emitted by the arc plasma is absorbed by a surrounding PTFE nozzle, leading to an ablation–dominated discharge. Video spectroscopy is carried out using an imaging spectrometer combined with a high–speed video camera. Carbon ion and fluorine atom line emission from the heating channel as well as copper, oxygen and nitrogen from ignition wire and ambient air are analyzed with focus on the low–current phases at the beginning of discharge and near current zero. Additionally, electrical parameters and total pressure are recorded while the general behavior of the discharge is observed by another video camera. Considering rotational symmetry of the arc the corresponding radial emission coefficients are determined. Finally, radial temperature profiles are calculated.

scholarly journals The continuing saga of Sakurai's object (V4334 Sgr): dust production and helium line emission

2000 ◽  
Vol 315 (3) ◽  
pp. 595-599 ◽  
Author(s):  
V. H. Tyne ◽  
S. P. S. Eyres ◽  
T. R. Geballe ◽  
A. Evans ◽  
B. Smalley ◽  
...  
Keyword(s):  
Line Emission ◽  
Dust Production ◽  
Helium Line

scholarly journals Substantial Disc Loss in the Be/X-ray Binary System A0535+26

2000 ◽  
Vol 175 ◽  
pp. 735-738
Author(s):  
N.J. Haigh ◽  
M.J. Coe ◽  
I.A. Steele ◽  
J. Fabregat
Keyword(s):  
Binary System ◽  
Ir Spectra ◽  
Optical Spectroscopy ◽  
Line Emission ◽  
Dramatic Reduction ◽  
Remarkable Change ◽  
X Ray ◽  
Helium Line ◽  
X Ray Binaries

AbstractInfrared JHK photometry from October 1998 revealed a remarkable change in the Be/X-ray binary system A0535+26, manifesting itself as a dramatic reduction in emission from the circumstellar disc. Optical and IR spectra presented here have confirmed this disc-loss in greater detail showing radically reduced Hydrogen and Helium line emission, to a degree never before seen in this system, and only rarely in a handful of Be/X-ray binaries. Optical spectroscopy has revealed the re-appearance of a small, stable inner disc, and IR spectra/photometry show the eventual regrowth of a robust circumstellar disc resembling the pre-disc-loss state.

scholarly journals Study of optical emission from laser-produced plasma expanding across an external magnetic field

2003 ◽  
Vol 21 (1) ◽  
pp. 65-71 ◽  
Author(s):  
VIRENDRA N. RAI ◽  
JAGDISH P. SINGH ◽  
FANG Y. YUEH ◽  
ROBERT L. COOK
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Emission Spectroscopy ◽  
Line Emission ◽  
Optical Emission ◽  
Atomic Emission ◽  
Laser Induced Plasma ◽  
Steady Magnetic Field ◽  
Three Body ◽  
Body Recombination

The laser-induced plasma obtained from the liquid target and expanding across a steady magnetic field has been studied using atomic emission spectroscopy. The line emission from the plasma was enhanced (>1.5 times) in the presence of a magnetic field, whereas background emission decreases. Enhancement in line intensity was found to be mainly a function of plasma beta (β). An increased rate of three-body recombination in plasma particles due to the cooling of the plasma during its expansion and an increase in effective plasma density as a result of its confinement seems to be the reason behind this enhancement.

Sign in / Sign up

Export Citation Format

Share Document