Method of determination of the electron density in the gap of high-current vacuum arc on the base of continual radiation analysis

2012 ◽  
Author(s):  
A. A. Logachev ◽  
M. V. Lisnyak
Keyword(s):  
Electron Density ◽  
Vacuum Arc ◽  
High Current ◽  
Method Of Determination

Determination of Cr density during high-current anode modes in vacuum arc

2019 ◽  
Vol 125 (13) ◽  
pp. 133301 ◽  
Author(s):  
A. Khakpour ◽  
S. Gortschakow ◽  
St. Franke ◽  
R. Methling ◽  
S. Popov ◽  
...  
Keyword(s):  
Vacuum Arc ◽  
High Current

scholarly journals Determination of Cr Density in the Active Phase of a High-current Vacuum Arcs

2017 ◽  
Vol 4 (2) ◽  
pp. 190-193 ◽  
Author(s):  
S. Gortschakow ◽  
A. Khakpour ◽  
S. Popov ◽  
St. Franke ◽  
R. Methling ◽  
...  
Keyword(s):  
High Speed ◽  
Active Phase ◽  
State Density ◽  
Vacuum Arc ◽  
Anode Surface ◽  
High Current ◽  
Electrode Gap ◽  
Broadband Absorption ◽  
Vapour Density

Melting and evaporation of the anode surface strongly influence the interruption capability of vacuum circuit breakers, because they lead to injection of atomic vapour into the inter-electrode gap. Determination of the vapour density and its dynamics with respect to different anode phenomena is therefore of great importance. Results of Cr density measurements in a high-current vacuum arc by using broadband absorption spectroscopy are presented. The vapour density of atomic Cr is determined after the formation of anode spots as well as close to the current zero. Cr I resonance lines at 425.43 nm have been used for the analysis. An AC current pulse with maximum value of 7 kA and a frequency of 100 Hz is applied to a vacuum arc between two cylindrical butt electrodes made of CuCr7525 with a diameter of 10 mm. The high-current anode modes are observed by means of high-speed camera imaging. The temporal evolution of the Cr ground state density is presented and discussed.

scholarly journals Determination of the voltage drop on a high-current vacuum arc discharge under conditions of a limited cross-section of the plasma flow

2021 ◽  
Vol 2064 (1) ◽  
pp. 012019
Author(s):  
A G Rousskikh ◽  
A S Zhigalin ◽  
V I Oreshkin ◽  
P Artyomov
Keyword(s):  
Cross Section ◽  
Plasma Flow ◽  
Voltage Drop ◽  
Arc Discharge ◽  
Vacuum Arc ◽  
High Current ◽  
Plasma Gun ◽  
Flow Through ◽  
Arc Current

Abstract The work is devoted to the study of the high-current vacuum arc discharge characteristics under conditions of a limited cross-section of the plasma flow. The experiments were carried out on the IMRI-5 setup with a sinusoidal arc current amplitude of 300–350 kA and a rise time of 500 ns. Aluminum rods with diameters from 3 to 7 mm were used as a cathode. The plasma flow was formed in a channel whose diameter was equal to that of the cathode. The features of the formation of a plasma jet with various configurations of the used plasma gun are described. The electrophysical parameters of the arc discharge are presented. Theoretical estimates of the voltage drop across the high-current arc during the outflow of a plasma flow through holes with a limited diameter are provided.

Determination of Cr Density After Current Zero in a High-Current Vacuum Arc Considering Anode Plume

2017 ◽  
Vol 45 (8) ◽  
pp. 2108-2114 ◽  
Author(s):  
Alireza Khakpour ◽  
Sergey Popov ◽  
Steffen Franke ◽  
Ruslan Kozakov ◽  
Ralf Methling ◽  
...  
Keyword(s):  
Vacuum Arc ◽  
High Current ◽  
Current Zero

Development of a method for multielemental determination in water by EDXRF with radioisotopic source of 238Pu.

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Camilo Fuentes Serrano ◽  
Juan Reinaldo Estevez Alvares ◽  
Alfredo Montero Alvarez ◽  
Ivan Pupo Gonzales ◽  
Zahily Herrero Fernandez ◽  
...  
Keyword(s):  
Thin Layer ◽  
Expanded Uncertainty ◽  
Considerable Decrease ◽  
X Ray ◽  
Precipitation Efficiency ◽  
Method Of Determination ◽  
Sensitivity Curves ◽  
Order Of Magnitude ◽  
Metrological Parameters

A method for determination of Cr, Fe, Co, Ni, Cu, Zn, Hg and Pb in waters by Energy Dispersive X Ray Fluorescence (EDXRF) was implemented, using a radioisotopic source of 238Pu. For previous concentration was employed a procedure including a coprecipitation step with ammonium pyrrolidinedithiocarbamate (APDC) as quelant agent, the separation of the phases by filtration, the measurement of filter by EDXRF and quantification by a thin layer absolute method. Sensitivity curves for K and L lines were obtained respectively. The sensitivity for most elements was greater by an order of magnitude in the case of measurement with a source of 238Pu instead of 109Cd, which means a considerable decrease in measurement times. The influence of the concentration in the precipitation efficiency was evaluated for each element. In all cases the recoveries are close to 100%, for this reason it can be affirmed that the method of determination of the studied elements is quantitative. Metrological parameters of the method such as trueness, precision, detection limit and uncertainty were calculated. A procedure to calculate the uncertainty of the method was elaborated; the most significant source of uncertainty for the thin layer EDXRF method is associated with the determination of instrumental sensitivities. The error associated with the determination, expressed as expanded uncertainty (in %), varied from 15.4% for low element concentrations (2.5-5 μg/L) to 5.4% for the higher concentration range (20-25 μg/L).

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