Quasi-spherical compression of a spark-channel plasma

1980 ◽  
Vol 58 (7) ◽  
pp. 983-999 ◽  
Author(s):  
E. Panarella
Keyword(s):  
Shock Waves ◽  
Electron Temperature ◽  
Plasma Electron ◽  
Neutron Production ◽  
Gas Pressure ◽  
Total Neutron ◽  
Neutron Output ◽  
Theta Pinch ◽  
Discharge Volume ◽  
Spark Channel

An axial spark channel in deuterium has been used as a target for implosive shock waves created with a conventional cylindrical theta-pinch device. The compression of the channel by the implosive waves raised the plasma electron temperature to ~ 120 eV for ~ 6 kJ of condenser bank energy and 1 Torr initial gas pressure.In order to improve the efficiency of compression, of the channel plasma and to reduce the end losses inherent in the cylindrical configuration, the theta-pinch geometry was then converted from cylindrical into spherical. Under identical conditions of gas pressure and condenser bank energy, the electron temperature now peaked at ~ 400 eV. When the bank energy was increased to ~ 10 kJ, neutron production was observed. The total neutron output per shot ranged from 105 to 106 and increased inversely with the pinch discharge volume.

scholarly journals Diagnostics of low-pressure capacitively coupled RF discharge argon plasma

2019 ◽  
Vol 13 (27) ◽  
pp. 76-82
Author(s):  
Kadhim A. Aadim
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Langmuir Probe ◽  
Gas Flow ◽  
Low Pressure ◽  
Gas Pressure ◽  
Rf Discharge ◽  
Electrode Gap ◽  
Probe Characteristic ◽  
Capacitively Coupled

Low-pressure capacitively coupled RF discharge Ar plasma has been studied using Langmuir probe. The electron temperature, electron density and Debay length were calculated under different pressures and electrode gap. In this work the RF Langmuir probe is designed using 4MHz filter as compensation circuit and I-V probe characteristic have been investigated. The pressure varied from 0.07 mbar to 0.1 mbar while electrode gap varied from 2-5 cm. The plasma was generated using power supply at 4MHz frequency with power 300 W. The flowmeter is used to control Argon gas flow in the range of 600 standard cubic centimeters per minute (sccm). The electron temperature drops slowly with pressure and it's gradually decreased when expanding the electrode gap. As the gas pressure increases, the plasma density rises slightly at low gas pressure while it drops little at higher gas pressure. The electron density decreases rapidly with expand distances between electrodes.

scholarly journals Measurement of plasma electron temperature and density by using different applied voltages and working pressures in a magnetron sputtering system

2018 ◽  
Vol 7 (3) ◽  
pp. 1177 ◽  
Author(s):  
Sabah N. Mazhir ◽  
Mohammed K. Khalaf ◽  
Sarah K. Taha ◽  
Hussein K . Mohsin
Keyword(s):  
Magnetron Sputtering ◽  
Electron Temperature ◽  
Electron Density ◽  
Applied Voltage ◽  
Low Cost ◽  
Plasma Electron ◽  
Spectral Lines ◽  
Glow Discharge Plasma ◽  
Working Pressure ◽  
Sputtering System

This paper discusses applying different voltages and pressure in the presence of silver target and argon gas to produce plasma. Home-made dc magnetron sputtering system was used to produce glow discharge plasma. The distance between two electrodes is 4 cm. Gas used to produce plasma is argon that flows inside the chamber with flow rate 40 sccm. Intensity of spectral lines, electron temperature and electron density were studied. The results show that the intensity of spectral lines increases with the increase of the working pressure and applied voltage. Electron temperature increases by the increase of applied voltage but decreases with the increase of working pressure, while electron density decreases with the increase of applied voltage and increases with the increase of working pressure. This research demonstrates a new low cost approach to start producing high corrosion resistance materials.  

scholarly journals New Approach, Taking into Account Elastic and Inelastic Processes, for Transport Properties of a two Temperature Plasma

1985 ◽  
Vol 40 (9) ◽  
pp. 885-891 ◽  
Author(s):  
C. Bonnefoi ◽  
J. Aubreton ◽  
J.-M. Mexmain
Keyword(s):  
Thermal Conductivity ◽  
Electron Temperature ◽  
Plasma Electron ◽  
Temperature Plasma ◽  
Heavy Particles ◽  
New Approach ◽  
Definition Of ◽  
Thermal Conductivity Λ ◽  
Two Temperature ◽  
Inelastic Processes

Abstract We have developed a modified Chapman-Enskog method for a two-temperature partially ionized plasma: electron temperature (Te) and heavy particles temperature (Th). We introduce a new definition of the diffusion forces and then calculate the reactive thermal conductivity λR.

Ionisationsmechanismus in der Relaxationszone schwach instationärer Stoßwellen in Argon und Krypton / Ionisation Mechanism in the Relaxation Zone oj Weakly Instationary Shock Waves in Argon and Krypton

1974 ◽  
Vol 29 (4) ◽  
pp. 568-576 ◽  
Author(s):  
G. Meinhold ◽  
F. Demmig ◽  
W. Bötticher
Keyword(s):  
Shock Waves ◽  
Shock Front ◽  
Electron Temperature ◽  
Excited States ◽  
Gas Temperature ◽  
Electron Collisions ◽  
Step Process ◽  
Gasdynamic Model ◽  
Excitation Processes ◽  
Additional Excitation

The primary ionisation relaxation up to electron densities of ne = 4·1013 cm-3 is investigated by means of 4 mm - microwave - interferometry. The values of the timedependent gas temperature Ta, and gas density na behind the shock front are calculated using a gasdynamic model which strictly takes into account the instationarity of the flow. From the results it is concluded that neither the familiar two step process dominated by atom collisions nor the assumption of additional excitation processes by electron collisions can fully describe the observed ionisation rates. There is evidence that both the ionisation rates and the electron temperature are influenced by transitions between the first four excited states due to superelastic electron collisions. As a result the electron temperature may even exceed the gas temperature.

Measurements of the Ion and Electron Temperature in a Theta-Pinch Plasma by Forward Scattering

1966 ◽  
Vol 16 (24) ◽  
pp. 1082-1085 ◽  
Author(s):  
B. Kronast ◽  
H. Röhr ◽  
E. Glock ◽  
H. Zwicker ◽  
E. Fünfer
Keyword(s):  
Electron Temperature ◽  
Forward Scattering ◽  
Pinch Plasma ◽  
Theta Pinch

Parametric Study of a Low-Pressure Theta-Pinch Discharge in Argon for Preliminary Analytical Optimization

1989 ◽  
Vol 43 (6) ◽  
pp. 991-997 ◽  
Author(s):  
Jeffrey S. White ◽  
Gae Ho Lee ◽  
Alexander Scheeline
Keyword(s):  
Discharge Current ◽  
Parametric Study ◽  
Low Pressure ◽  
Gas Pressure ◽  
Discharge Energy ◽  
Current Waveform ◽  
Theta Pinch ◽  
Discharge Gas

The qualitative dependence of spectrochemical performance of a thetapinch discharge on a variety of experimental variables including discharge gas pressure, sample positioning, discharge energy, and discharge current waveform is reported.

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