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Gas discharges in supercritical fluids are an excellent candidate for high-power switching duty. Experimental and theoretical research has been performed. We present an analysis of results and a quick comparison with SF6 and CO2.
On the sun we can identify many of the motions derived from stellar spectral analysis. A summary is given of the observed solar velocity phenomena. Many of these (e.g. meridional flow, giant cells, solar differential rotation, supergranula tion) are of great interest in astrophysics especially for interior structure and chromospheric and coronal structuring but contribute virtually nothing to the...
The present chapter highlights the problems facing when modelling the marine environment, in particular for biochemical aspects. It is shown how the marine environment differs from other fluids and how this affects modelling. General modelling approaches are shown and the problem of the vaste range of scales encountered is adressed. In addition to mathematical modelling problems, practical questions...
Important aspects of pulsed power processing that up to now received little attention are opened and summarized. A start is made in dealing with these aspects. They can be summarized as matching power source to process by controlling the global parameters impedance, time distribution, energy distribution and spatial distribution. An application is presented that can help changing the future of the...
Fast and repetitive switching in high-power circuits is a challenging task where the ultimate solutions still have to be found. Areas of application are pulsed power technology and power stations. We proposed a new approach. Supercritical fluids have insulation strength and thermal properties like liquids and fluidity, self-healing and absence of bubbles like gases. That's why we start investigating...
Supercritical fluid(SCF), characterized by high pressure and high density, combines the advantage of gas and liquid: high ability of mass transfer (dense, high diffusivity and low viscosity) and high heat transfer (high heat conductivity). Research on discharge behavior of SCF in high electrical field are more recent and less common, and are also motivated by new environmental and economical reasons...
Supercritical fluid (SCF), characterized by high pressure and high density, combines the advantage of gas and liquid: high ability of mass transfer (dense, high diffusivity and low viscosity) and high heat transfer (high heat conductivity). Research on discharge behavior of SCF in high electrical field is more recent and less common, and is also motivated by new environmental and economical reasons...
In this paper we present a circuit topology with driftstep recovery diodes. We will explore the effect of higher forward and reverse currents on the circuit performance. In addition, we realized an adjustable output voltage of the pulser. The primary capacitor voltage can be varied while maintaining proper saturation of the pulse transformer. We will introduce a solution with a pre-magnetizing circuit...
In this paper we present a solid state 0–120 kV microsecond pulse charger for our nanosecond pulse generator [1]. The pulse forming line of our nanosecond pulse generator must be charged with microsecond pulses to prevent pre-firing of its oil spark-gap. The pulse charger consists of two identical compact pulse charger modules with integrated electronics. The electronics are mounted on a compact PCB...
The introduction by the Ioffe Institute of an unconventional switching mechanism, based on the very fast recovery of a drift-step recovery diode (DSRD) allows methods for pulsed power generation [1–2]. Therefore a circuit topology is needed to generate a fast forward current through the DSRD, before a reverse current can activate the drift step recovery. This requires a complicated circuit, consisting...
In this paper we present a solid state 120 kV microsecond pulse charger for our nanosecond pulse generator [1]. The pulse forming line of our nanosecond pulse generator must be charged with microsecond pulses to prevent pre-firing of its oil spark-gap. The pulse charger consists of three identical very compact pulse transformer units with integrated electronics. The electronics are mounted on a compact...
The application of self-optimization allows future manufacturing processes to adapt to changing process boundary conditions automatically. Integrated intelligence in the form of expert knowledge allows the extension of application fields of the manufacturing processes, the guarantee of the product quality and the reduction of machine down time. The subject of this paper is research work about the...
The LTD (Linear-Transformer-Driver), in fact a kind of Inductive-Voltage-Adder, is gaining importance with regard to transient plasma generation. A LTD is based on multiple discharge branches, where each branch consists of an energy storage capacitor and a switch. All branches are magnetically coupled, and discharged simultaneously for high power pulse generation.
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