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Summary form only given: The anode attachment of the arc plays an important role for the anode erosion characteristics and the anode lifetime. These phenomena are required to prevent the anode erosion. The interaction of the anode attachment with lateral gas forming a cold boundary layer has been researched, previously. The anode attachment stability is applied to the non-transferred torches such...
This paper presents a model of the typical dielectric barrier plasma discharge at atmospheric pressure, structured as an equivalent electric circuit whose elements are identified with, and deducted from, the main influential variables of the process, namely, the applied gas, the geometry of the reactor, the breakdown parameters, as well as the power supply associated to the dielectric barrier discharge...
An inductively coupled pulsed plasma source with an operating frequency of 29 kHz is under investigation at the Institute for Applied Physics in Frankfurt. The experimental setup consists of a series resonance circuit with a load capacitance of 12 muF and a large diameter induction coil surrounding a spherical discharge vessel. During discharge generation pulse coil currents reached a maximum value...
Summary form only given. High-power high-pressure induction thermal plasmas have been widely used in many material processing fields such as syntheses of nanopowders and thermal barrier coatings etc, because they have advantages such as remarkably higher enthalpy and higher radical density than cold plasmas, and also little contamination. To functionalize induction thermal plasmas, we have developed...
Paper due to the influence of wide range of agents undergoes different degradation processes that result in alarming conditions of most of the historical documents. One of the problems that have to be solved is the paper biodeterioration by microbiological agents. Generally the paper material sterilization can be achieved by chemical and/or physical means, such as heat, chemical solutions, gases and...
Direct observation of an attosecond pulse train, formed with synthesized high- order harmonic fields of an intense femtosecond pulse, is demonstrated. The two photon above-threshold ionization of an argon atom and the two-photon Coulomb explosion of a nitrogen molecule are utilized as a correlated signal of our autocorrelation measurements.
Summary form only given. The decrease of electrode erosion is important to keep the arc and to save the cost. Normally, the vacuum or rare gases such as argon and helium are used to prevent the electrode erosion. If the anode attachment of arc is moving, the decrease of electrode erosion could be achieved even if atmosphere is air. In this paper, the arc movement in rail-gun. especially restrike phenomena...
A municipal waste of 50 million tons a year has been generated in Japan. There is demand for harmless processing and environmental safety of fly ash. Plasma arc is effective in melting process of one of the fly ash. Incineration and melted processing technology of argon and nitrogen plasma are dominate in Japan. However, there are few reports of radiation distribution emitted from argon and nitrogen...
Up to 4 cm long corrugated plasma waveguides are generated in clustered hydrogen, nitrogen, and argon gas jets. The corrugation period is as short as 70 mum with relative modulation amplitudes up to -20%.
The fraction of the ion flux in the radially expanding plasma flux was obtained in hot refractory anode vacuum arc by measuring the ion current and the film deposition characteristics. Experiments were conducted with an arc current of 200 A, a molybdenum anode and an electrode separation of about 10 mm. It was found that the collected ion current in vacuum increased about twice from the beginning...
Summary form only given. It is well known that stimulated rotational Raman scattering (SRRS) in atmospheric nitrogen presents a limitation to the propagation of high-intensity laser radiation through long air paths. A method that has sometimes been proposed to mitigate this problem in laser fusion facilities is to replace part of the air path with a breathable mixture of oxygen and a monatomic gas...
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