scholarly journals Effect on Deuteron Temperature on Iron Forbidden Line Intensities in RF-Heated Tokamak Plasmas

1988 ◽  
Vol 102 ◽  
pp. 199-202
Author(s):  
K. Sato ◽  
S. Suckewer ◽  
A. Wouters
Keyword(s):  
Temperature Measurement ◽  
Temperature Sensitive ◽  
Tokamak Plasmas ◽  
Rf Heating ◽  
Collisional Excitation ◽  
Ion Temperature ◽  
Noticeable Effect ◽  
Line Intensities ◽  
Proton Temperature ◽  
Sensitive Line

AbstractTwo line ratios, the forbidden line at 845.5 Å to the allowed line at 135.7 Å in Fe XXII and the forbidden line at 592.1 Å to the forbidden line at 1118.2 Å in Fe XIX, have been measured as ion temperature-sensitive line ratios during rf heating in the Princeton Large Torus. The results indicate that deuteron collisions in plasmas of high deuteron temperature have a noticeable effect on the intensity of the forbidden lines. Measured relative intensities are compared with values from level population calculations which include deuteron collisional excitation between the levels of the ground configuration. The agreement between the observed and calculated ratios is within 30%. A method for deuteron (or proton) temperature measurement in tokamak plasmas is discussed.1More details about this experiment can be found in Ref. 2.

scholarly journals Possible Density Determination of the Nebular Component of Cataclysmic Variables with the N III 4641/4635 Line Ratio

2004 ◽  
Vol 194 ◽  
pp. 258-258
Author(s):  
Joaquín Bohigas ◽  
Eduardo Pérez-Tijerina ◽  
Roberto Machorro
Keyword(s):  
Radiative Decay ◽  
Cataclysmic Variables ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Line Ratio ◽  
Temperature Sensitive ◽  
Collisional Excitation ◽  
Important Diagnostic Tool ◽  
Sensitive Line

The dependence of the N III 4641/4635 line ratio on the electron density is presented. It is shown that this ratio may be an important diagnostic tool in cataclysmic variables.Pérez-Tijerina, Bohigas & Machorro (2001) used the Chianti code and database developed by the U.S. Nautical Observatory (Landi, 200) in order to find density and temperature sensitive line ratios in the conditions occuring in plasmas produced in pulsed laser deposition experiments for thin film deposition, i.e., around 1018 cm 3 and 104 K. Level populations are determined considering only radiative decay and collisional excitation and de-excitation.

Ion temperature measurement of tokamak plasmas by collective Thomson scattering ofD2O laser radiation

1989 ◽  
Vol 62 (24) ◽  
pp. 2833-2836 ◽  
Author(s):  
R. Behn ◽  
D. Dicken ◽  
J. Hackmann ◽  
S. A. Salito ◽  
M. R. Siegrist ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Temperature Measurement ◽  
Thomson Scattering ◽  
Tokamak Plasmas ◽  
Ion Temperature ◽  
Collective Thomson Scattering

Optimum pulse length of a high-power SMM laser for Tokamak ion temperature measurement

1982 ◽  
Vol 24 (10) ◽  
pp. 1325-1329 ◽  
Author(s):  
T Okada ◽  
K Kato ◽  
R Noudomi ◽  
M Muraoka ◽  
M Akazaki
Keyword(s):  
Temperature Measurement ◽  
High Power ◽  
Pulse Length ◽  
Ion Temperature

scholarly journals Formic acid above the Jungfraujoch during 1985–2007: observed variability, seasonality, but no long-term background evolution

2010 ◽  
Vol 10 (6) ◽  
pp. 14771-14814 ◽  
Author(s):  
R. Zander ◽  
P. Duchatelet ◽  
E. Mahieu ◽  
P. Demoulin ◽  
G. Roland ◽  
...  
Keyword(s):  
Formic Acid ◽  
High Spectral Resolution ◽  
Temperature Sensitive ◽  
Atmospheric Gases ◽  
Vertical Column ◽  
Line Intensities ◽  
Sigma Level ◽  
Remote Measurements ◽  
Remote Determination

Abstract. This paper reports on daytime total vertical column abundances of formic acid (HCOOH) above the Northern mid-latitude, high altitude Jungfraujoch station (Switzerland; 46.5° N, 8.0° E, 3580 m altitude). The columns were derived from the analysis of infrared solar observations regularly performed with high spectral resolution Fourier transform spectrometers during over 1537 days between September 1985 and September 2007. The investigation was based on the spectrometric fitting of five spectral intervals, one encompassing the HCOOH ν6 band Q branch at 1105 cm−1, and four additional ones allowing to optimally account for critical temperature-sensitive or timely changing interferences by other atmospheric gases, in particular HDO, CCl2F2 and CHClF2. The main results derived from the 22 yr long database indicate that the free tropospheric burden of HCOOH above the Jungfraujoch undergoes important short-term daytime variability, diurnal and seasonal modulations, inter-annual anomalies, but no statistically significant long-term background change at the 1-sigma level. A major progress in the remote determination of the atmospheric HCOOH columns reported here has resulted from the adoption of new, improved absolute spectral line intensities for the infrared ν6 band of trans-formic acid, resulting in retrieved free tropospheric loadings being about a factor two smaller than if derived with previous spectroscopic parameters. Implications of this significant change with regard to earlier remote measurements of atmospheric formic acid and comparison with relevant Northern mid-latitude in situ findings will be assessed critically. Sparse HCOOH model predictions will also be evoked.

scholarly journals Population modelling of the He II energy levels in tokamak plasmas: I. Collisional excitation model

2019 ◽  
Vol 52 (4) ◽  
pp. 045001
Author(s):  
K D Lawson ◽  
K M Aggarwal ◽  
I H Coffey ◽  
F P Keenan ◽  
M G O’Mullane ◽  
...  
Keyword(s):  
Energy Levels ◽  
Tokamak Plasmas ◽  
Collisional Excitation ◽  
Population Modelling ◽  
Excitation Model
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