scholarly journals Investigations concerning plasma parameters and population inversion in laser-produced counterstreaming plasmas

1991 ◽  
Vol 9 (2) ◽  
pp. 501-515 ◽  
Author(s):  
P. Glas ◽  
M. Schnürer
Keyword(s):  
Computational Analysis ◽  
Nuclear Charge ◽  
Gain Coefficient ◽  
Spectral Lines ◽  
Interaction Zone ◽  
Electron Number ◽  
Plasma Parameters ◽  
X Ray ◽  
Spatial Intensity Distribution ◽  
Resonance Transitions

We investigated the case where two laser-produced plasmas collide nearly head on. Special attention was devoted to the fundamentals necessary to realize a coherent X-ray source. A gas-dynamic computational analysis was performed to understand the evolution of the density, the temperature, and the velocity of merging plasmas. The spatial intensity distribution of selected spectral lines reveals that the interaction of plasmas of different nuclear charge and charge state is not strictly collision dominated. Using spectral line intensity ratios, we determined electron temperatures and electron number densities, as well as the intensity inversion on the 4–1 to 3–1 resonance transitions of [He]-like Al. Inversion occurs in the vicinity of the targets if identical materials are used (Al–Al) and is possibly indicated in the interaction zone for different ones (Al–Cu), too. The inversion factors (and the gain coefficient) for the 4–3 transition of [He]-like Al at about 130 Å were estimated.

scholarly journals Time-Resolved Spectra in the 5–330 Å Region Emitted from the PLT and TFTR Tokamak Plasmas

1984 ◽  
Vol 86 ◽  
pp. 171-174
Author(s):  
J.L. Schwob ◽  
A.W. Wouters ◽  
S. Suckewer ◽  
F.P. Boody ◽  
M. Finkenthal
Keyword(s):  
Particle Transport ◽  
Spectral Lines ◽  
Tokamak Plasmas ◽  
Time Resolved ◽  
X Ray ◽  
Radiation Losses ◽  
Transport Studies ◽  
Resonance Transitions ◽  
Metallic Impurities ◽  
Multichannel Spectrometer

The analysis of impurity radiation from Tokamak plasmas is one of the most important diagnostics, allowing the measurement of the impurity concentrations, radiation losses and particle transport studies. This study requires simultaneous time-resolved observation of spectral lines from many ionization states for each element. The most intense and important lines are the He and H-like resonance transitions of Oxygen and Carbon and Δn = 0, 1 transitions of highly ionized metallic impurities. These emmissions have been recorded on PLT and TFTR tokamaks by means of a soft X-ray multichannel spectrometer (SOXMOS).

scholarly journals Spectroscopic study of plasma produced with a heavy ion maxilac beam

1992 ◽  
Vol 10 (4) ◽  
pp. 737-742 ◽  
Author(s):  
G. E. Belyaev ◽  
B. A. Bryunetkin ◽  
A. A. Golubev ◽  
K. Mahrt-Olt ◽  
I. Y. Skobelev ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Electron Impact ◽  
Ionic Composition ◽  
Heavy Ion ◽  
Spectral Lines ◽  
Visible Range ◽  
Plasma Parameters ◽  
X Ray ◽  
Characteristic Emission

Spectroscopic study of plasma produced through bombardment of the 1 × 3 mm2 area on the surface of a solid Mg target with Kr+ ions is carried out. Spectral lines of Mg I and Mg II ions were observed in the visible range (200–600 nm). The plasma parameters Ne = 1.4.1017 cm−3 and Te = 0.8 eV are calculated from electron impact broadening of the 4f–3d line of Mg II and from the ratio of intensities for the 4f–3d and 4s–3p lines of Mg II. The ionic composition of the plasma is determined. The detected X-ray emission is shown to be the characteristic emission of the target.

scholarly journals High-resolution measurements of X-ray emission from dense quasi-1D plasma: Line merging and profile modification

1999 ◽  
Vol 17 (3) ◽  
pp. 365-375 ◽  
Author(s):  
O. RENNER ◽  
P. SONDHAUSS ◽  
O. PEYRUSSE ◽  
E. KROUSKÝ ◽  
R. RAMIS ◽  
...  
Keyword(s):  
Theoretical Data ◽  
Theoretical Models ◽  
Spectral Lines ◽  
Line Profiles ◽  
Plasma Parameters ◽  
X Ray ◽  
Profile Modification ◽  
Spatially Resolved ◽  
Plasma Line ◽  
Band Spectra

The precise measurements of the spectral line profiles near the short-wavelength limit of the Lyman series of Al are reported. The spatially resolved narrow-band spectra were attributed to macroscopic plasma parameters by using the results of 1D and 2D hydrodynamic plasma modeling. The gradual merging and broadening of the spectral lines Al Lyε–θ was compared to the synthetic spectra produced by atomic physics codes. The discrepancies between the experimental and theoretical data indicate the limits for applicability of standard theoretical models.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

Measurement of plasma parameters of a quasistationary plasma accelerator from self-absorbed spectral lines

1992 ◽  
Vol 56 (3) ◽  
pp. 281-286
Author(s):  
Ya. F. Volkov ◽  
V. V. Marinin ◽  
N. I. Mitina ◽  
M. A. Tiarov ◽  
S. A. Trubchaninov
Keyword(s):  
Plasma Accelerator ◽  
Spectral Lines ◽  
Plasma Parameters

scholarly journals Silicon in the solar corona

1965 ◽  
Vol 23 ◽  
pp. 115-123
Author(s):  
K. G. Widing ◽  
J. R. Porter
Keyword(s):  
Solar Corona ◽  
Relative Intensity ◽  
Line Emission ◽  
X Ray ◽  
Resonance Transitions ◽  
Spectral Ranges

Resonance lines of coronal ions of silicon are prominent in the spectral ranges 40–62 Å and 254–356 Å.An unexpected feature of the soft X-ray spectrum is the weakness or absence of the resonance lines of iron in ionization stages XI through XV.A second feature is the prominence of lines of the type (3d → 2p) relative to the resonance transitions (3p → 2s) in Li-like and Beryllium-like spectra. It is suggested that the upper levels (3d) are excited by quadrupole collisions from the ground 2s or 2s2levels.The intensity of the soft X-ray lines relative to the resonance lines in the 300 Å region seems to be more consistent with temperatures well above one million degrees than with temperatures as low as 700000°K, but the data are not adequate for a precise comparison. The relative intensity of the line emission from the various stages of silicon ionization may be interpreted as indicating that the ionization of silicon peaks in stages IX and X.The abundances of C, Mg, S, and Al relative to silicon do not seem to be greatly different from the chromospheric abundances reported by Pottasch or with the photospheric abundances.

Determination of the plasma parameters in the PF-3 facility by the methods of X-ray spectroscopy

2011 ◽  
Vol 37 (11) ◽  
pp. 935-947 ◽  
Author(s):  
E. O. Baronova ◽  
V. P. Vinogradov ◽  
V. I. Krauz ◽  
V. V. Myalton ◽  
A. M. Stepanenko ◽  
...  
Keyword(s):  
Plasma Parameters ◽  
X Ray

scholarly journals Excitation and analytical characteristics of an ethanol loaded U-shaped arc

2003 ◽  
Vol 68 (2) ◽  
pp. 109-118 ◽  
Author(s):  
Marija Raskovic ◽  
Ivanka Holclajtner-Antunovic ◽  
Mirjana Tripkovic ◽  
Dragan Markovic
Keyword(s):  
Spectral Line ◽  
Electron Number Density ◽  
Ethanol Solution ◽  
Number Density ◽  
Electron Number ◽  
Plasma Parameters ◽  
Line Intensities ◽  
Ethanol Addition ◽  
Plasma Characteristics ◽  
Dc Arc

The effect of the ethanol load on the discharge and analytical parameters of an argon stabilized U-shaped DC arc has been recorded. Measurements of the radial distribution of the apparent temperatures and the electron number density of the DC plasma showed that ethanol addition causes a decrease in both plasma parameters. The changes in the plasma characteristics, as well as in transport and atomisation processes of the analyte cause a general change in the spectral line intensities, which depends on the physical characteristics of the analyte and the quantity of ethanol loaded into the plasma. Improved detection limits were obtained for V and Mn when a 10%(v/v) water?ethanol solution was nebulized into the plasma.

Sign in / Sign up

Export Citation Format

Share Document