Measurement of the spatial characteristics of an erosive silicon laser plasma using small-sized high-resolution spectrometers

2021 ◽  
pp. 38-42
Author(s):  
Boris A. Lapshinov ◽  
Nikolay I. Timchenko
Keyword(s):  
Laser Plasma ◽  
Emission Spectra ◽  
Target Surface ◽  
Spectral Lines ◽  
Slit Diaphragm ◽  
Plasma Radiation ◽  
Atmospheric Conditions ◽  
Spatial Characteristics ◽  
Silicon Target ◽  
Oriented Parallel

The spatial characteristics of the erosion laser plasma are investigated. The application of small-sized spectrometers of the visible and ultraviolet ranges for recording the spectrum of plasma radiation is considered. Erosive laser plasma is formed on the surface of a silicon target under the action of pulsed laser radiation with a wavelength of 1064 nm under normal atmospheric conditions. The laser plasma torch was scanned using a movable slit diaphragm oriented parallel to the target surface. The emission of erosion laser plasma was recorded using small-size spectrometers. Based on the obtained plasma emission spectra, the dependences of the intensity of the spectral lines of silicon on the geometric position of the slit diaphragm are revealed. A comparison is made of the intensities of the spectral lines of silicon on the polished and grinded sides of the target.

scholarly journals Photo-ionized neon plasmas induced by radiation pulses of a laser-plasma EUV source and a free electron laser FLASH

2013 ◽  
Vol 31 (2) ◽  
pp. 195-201 ◽  
Author(s):  
A. Bartnik ◽  
R. Fedosejevs ◽  
P. Wachulak ◽  
H. Fiedorowicz ◽  
C. Serbanescu ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Spectral Characteristics ◽  
Emission Spectra ◽  
Spectral Lines ◽  
Plasma Radiation ◽  
Beam Radiation ◽  
Radiation Beam ◽  
Ionized Plasmas

AbstractIn this work, a laser-produced plasma extreme ultraviolet source and a free electron laser were used to create Ne photo-ionized plasmas. In both cases, a radiation beam was focused onto a gas stream injected into a vacuum chamber synchronously with the radiation pulse. Extreme ultraviolet radiation from the plasma spanned a wide spectral range with pronounced maximum centered at λ = 11 ± 1 nm while the free electron laser pulses were emitted at a wavelength of 32 nm. The power density of the focused plasma radiation was approximately 2 × 107 W/cm2 and was seven orders of magnitude lower compared with the focused free electron laser beam. Radiation fluences in both experimental conditions were comparable. Despite quite different spectral characteristics and extremely different power densities, emission spectra of both photo-ionized plasmas consist of the same spectral lines within a wavelength range of 20 to 50 nm, however, with different relative intensities of the corresponding lines. The dominating spectral lines originated from singly charged ions (Ne II); however, Ne III lines were also detected. Additionally, computer simulations of the emission spectra, obtained for photo-ionized plasmas, driven by the plasma extreme ultraviolet source, were performed. The corresponding measured and calculated spectra are presented. An electron temperature and ionic composition were estimated. Differences between the experimental spectra, obtained for both irradiation conditions, were analyzed. The differences were attributed mainly to different energies of driving photons.

scholarly journals Research on interactions of plasma streams with CFC targets in the Rod Plasma Injector facility

Nukleonika ◽  
2016 ◽  
Vol 61 (2) ◽  
pp. 179-183
Author(s):  
Dobromil R. Zaloga ◽  
Roch Kwiatkowski ◽  
Elżbieta Skladnik-Sadowska ◽  
Marek J. Sadowski ◽  
Katarzyna Nowakowska-Langier
Keyword(s):  
Fibre Composite ◽  
Emission Spectra ◽  
Optical Emission ◽  
Target Surface ◽  
Spectral Lines ◽  
Optical Measurements ◽  
Plasma Stream ◽  
Operational Parameters ◽  
Carbon Fibre Composite ◽  
Sem Images

AbstractThis paper present results of optical spectroscopy studies of interactions of intense plasma streams with a solid target made of carbon fibre composite (CFC). The experiments were carried out within the Rod Plasma Injector (RPI) IBIS facility. The optical measurements were performed first for a freely propagating plasma stream in order to determine the optimal operational parameters of this facility. Optical emission spectra (OES) were recorded for different operational modes of the RPI IBIS device, and spectral lines were identified originating from the working gas (deuterium) as well as some lines from the electrode material (molybdenum). Subsequently, optical measurements of plasma interacting with the CFC target were performed. In the optical spectra recorded with the irradiated CFC samples, in addition to deuterium and molybdenum lines, many carbon lines, which enabled to estimate erosion of the investigated targets, were recorded. In order to study changes in the irradiated CFC samples, their surfaces were analysed (before and after several plasma discharges) by means of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) techniques. The analysis of the obtained SEM images showed that the plasma irradiation induces noticeable changes in the surface morphology, for example vaporisation of some carbon fibres and formation of microcracks. The obtained EDS images showed that upon the irradiated target surface, some impurity ions are also deposited, particularly molybdenum ions from the applied electrodes.

Analysis of spectral and spatial characteristics of tin laser plasma

2010 ◽  
Vol 28 (0) ◽  
pp. 129-134
Author(s):  
Л. В. Месарош ◽  
М. П. Чучман ◽  
І. Е. Качер
Keyword(s):  
Laser Plasma ◽  
Spatial Characteristics

The investigation of aluminium laser plasma radiation at different air preasures

2009 ◽  
Vol 24 (0) ◽  
pp. 126-130
Author(s):  
Л. В. Месарош ◽  
М. П. Чучман ◽  
О. К. Шуаібов ◽  
І. Е. Качер ◽  
Г. Е. Ласлов
Keyword(s):  
Laser Plasma ◽  
Plasma Radiation

Hard X radiation and fast particles in laser plasma experiments at laser intensities of up to 5×1018 W/cm2 on the target surface

JETP Letters ◽  
2000 ◽  
Vol 71 (6) ◽  
pp. 246-249
Author(s):  
V. G. Borodin ◽  
O. N. Gilev ◽  
A. L. Zapysov ◽  
V. M. Komarov ◽  
V. A. Lykov ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Target Surface

Study of Temperature Behavior of Luminescence Emission of LaVO4 and La1-xEuxVO4 Powders

2015 ◽  
Vol 230 ◽  
pp. 153-159 ◽  
Author(s):  
Oksana Chukova ◽  
Sergiy G. Nedilko ◽  
Sergiy A. Nedilko ◽  
Tetiana Voitenko ◽  
Olga Gomenyuk ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Spectral Lines ◽  
Temperature Behavior ◽  
Precipitation Method ◽  
Temperature Range ◽  
Luminescence Emission ◽  
Electron Transitions ◽  
The Matrix ◽  
Co Precipitation ◽  
The Eu

The La1‑xEuxVO4 powders were synthesized by co-precipitation method. Emission spectra of the LaEuVO4 and La1‑xEuxVO4 powders consist of wide non-structural bands of the matrix emission and narrow spectral lines caused by inner f-f electron transitions in the Eu3+ ions, respectively. The both types of emission were studied within 8 – 300 K temperature range. Decomposition of spectra of the wide matrix emission on three bands has been carried out and temperature dependencies for each band were studied. Temperature behavior of the Eu3+ emission was investigated for lines assigned to different Eu3+ centres. Obtained dependencies are analyzed and discussed using proposed schemes of transitions in the VO43- groups and structure of the nearest surrounding of the Eu3+ emission centres.

scholarly journals The horizontal resolution of MIPAS

2008 ◽  
Vol 1 (1) ◽  
pp. 103-125 ◽  
Author(s):  
T. von Clarmann ◽  
C. De Clercq ◽  
M. Ridolfi ◽  
M. Höpfner ◽  
J.-C. Lambert
Keyword(s):  
Michelson Interferometer ◽  
Elevation Angle ◽  
Emission Spectra ◽  
Horizontal Resolution ◽  
Atmospheric Composition ◽  
Trace Gas ◽  
Atmospheric Conditions ◽  
Tangent Point ◽  
High Vertical Resolution ◽  
Along Track

Abstract. Limb remote sensing from space provides atmospheric composition measurements at high vertical resolution while the information is smeared in the horizontal domain. The horizontal components of two-dimensional (altitude and along-track coordinate) averaging kernels of a limb retrieval constrained to horizontal homogeneity can be used to estimate the horizontal resolution of limb retrievals. This is useful for comparisons of measured data with modeled data, to construct horizontal observation operators in data assimilation applications or when measurements of different horizontal resolution are intercompared. We present these averaging kernels for retrievals of temperature, H2O, O3, CH4, N2O, HNO3 and NO2 from MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) high-resolution limb emission spectra. The horizontal smearing of a MIPAS retrieval in terms of full width at half maximum of the rows of the horizontal averaging kernel matrix varies typically between about 200 and 350 km for most species, altitudes and atmospheric conditions. The range where 95% of the information originates from varies from about 260 to 440 km for these cases. This information spread is smaller than the MIPAS horizontal sampling, i.e. MIPAS data are horizontally undersampled, and the effective horizontal resolution is driven by the sampling rather than the smearing. The point where the majority of the information originates from is displaced from the tangent point towards the satellite by typically less than 10 km for trace gas profiles and about 50 to 100 km for temperature, with a few exceptions for uppermost altitudes. The geolocation of a MIPAS profile is defined as the tangent point of the middle line of sight in a MIPAS limb scan. The majority of the information displacement with respect to this nominal geolocation of the measurement is caused by the satellite movement and the geometrical displacement of the actual tangent point as a function of the elevation angle. In none of the cases investigated, propagation of the horizontal smoothing on the vertical profile shape has been observed.

Influence of the pressure of a gaseous atmosphere on the characteristics of the emission spectra of a laser plasma generated on the surfaces of solid targets

1998 ◽  
Vol 28 (8) ◽  
pp. 685-688 ◽  
Author(s):  
O A Bukin ◽  
I V Bazarov ◽  
N S Bodin ◽  
A A Ilyin ◽  
V D Kiselev ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Emission Spectra ◽  
Gaseous Atmosphere

Characterization of multilayer x-ray mirrors for the λ ⋍ 19 nm range using a laser-plasma radiation source

1993 ◽  
Vol 23 (1) ◽  
pp. 76-80 ◽  
Author(s):  
I A Zhitnik ◽  
S V Kuzin ◽  
M M Mitropol'skiĭ ◽  
Evgenii N Ragozin ◽  
V A Slemzin ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Radiation Source ◽  
Plasma Radiation ◽  
X Ray ◽  
Nm Range

scholarly journals Studies of plasma interactions with tungsten targets in PF-1000U facility

Nukleonika ◽  
2016 ◽  
Vol 61 (2) ◽  
pp. 149-153
Author(s):  
Maryna S. Ladygina ◽  
Elzbieta Skladnik-Sadowska ◽  
Dobromil R. Zaloga ◽  
Marek J. Sadowski ◽  
Monika Kubkowska ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Optical Emission ◽  
Target Surface ◽  
Sample Surface ◽  
Optical Microscope ◽  
High Plasma ◽  
Spectral Lines ◽  
Optical Measurements ◽  
Plasma Stream ◽  
Plasma Parameters

Abstract This paper presents results of experimental studies of tungsten samples of 99.95% purity, which were irradiated by intense plasma-ion streams. The behaviour of tungsten, and particularly its structural change induced by high plasma loads, is of great importance for fusion technology. The reported measurements were performed within a modified PF-1000U plasma-focus facility operated at the IFPiLM in Warsaw, Poland. The working gas was pure deuterium. In order to determine the main plasma parameters and to study the behaviour of impurities at different instants of the plasma discharge, the optical emission spectroscopy was used. The dependence of plasma parameters on the initial charging voltage (16, 19 and 21 kV) was studied. Detailed optical measurements were performed during interactions of a plasma stream with the tungsten samples placed at the z-axis of the facility, at a distance of 6 cm from the electrode outlets. The recorded spectra showed distinct WI and WII spectral lines. Investigation of a target surface morphology, after its irradiation by intense plasma streams, was performed by means of an optical microscope. The observations revealed that some amounts of the electrodes material (mainly copper) were deposited upon the irradiated sample surface. In all the cases, melted zones were observed upon the irradiated target surface, and in experiments performed at the highest charging voltage there were formed some cracks.

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