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Summary form only given. An atmospheric pressure plasma jet driven by energy controlled DC pulse has been developed. Unlike the most commonly used dielectric barrier atmospheric discharge sources, the proposed device utilize dielectric-free metal electrode with externally controllable ballast capacitor. Discharge energy per pulse can easily and precisely be controlled by voltage and capacitance of...
Summary form only given. This paper presents initial designs of multiple-shell gas puff imploding loads for the refurbished Z generator. The nozzle has three independent drivers for three independent plena. The outer and middle plena may be charged to 250psia whilst the central jet can be charged to 1000psia. 8-cm and 12-cm outer diameter nozzles have been built and tested on the bench. The unique...
Summary form only given. Parameters of the plasma produced by a ferroelectric plasma source (FPS) assisted high-current (~1 kA) hollow anode (HA), low-pressure (10-4 Torr) Ar gas discharge were studied using a time- and space-resolved laser induced fluorescence (LIF) diagnostic technique. It was shown that the plasma filling of the HA cavity occurs due to the expansion of the plasma flows generated...
Summary form only given. The interaction of electromagnetic (EM) waves with magnetized plasmas is an active area of research. Most of the research so far have focused upon waves launched in the (k ∥ Bo) mode where the wave vector (k) is parallel to the static magnetic field (Bo), and Bo is approximately uniform over the plasma volume with the dimension of the plasma much larger than the free space...
In this study, a large gap of the distance between electrodes (>5.5 mm) of Ar atmospheric pressure glow discharge (APGD) in radio frequency dielectric barrier discharges (RF-DBD) is achieved. The I-V characteristic and I-phase angle characteristic of RF-DBD are studied in detail. The discharge characteristic of Ar mixed with N2, O2 and air, respectively, was diagnosed by the optical emission spectrum...
Summary form only given. The anode attachments in a high intensity transferred argon arc at atmospheric pressure have been investigated experimentally. With fixed arc current (100 A), reducing plasma working gas flow rate has been used to realize the transition from the well-known diffuse attachment mode to the constricted attachment mode. Two transition modes have been found, namely a lift-up mode...
Summary form only given. Optical radiation of a D.C. plasma torch working with argon at various flow rates was observed by an optical system consisting of arrays of optical fibers and photodiodes (each array formed by 15 elements) arranged at 2 levels above the nozzle and at 4 directions separated by angle intervals 45deg. The sample rate of the electronic equipment recording the optical data was...
Summary form only given. A mixture of hydrogen with primary plasma gas argon has been used to investigate some fundamental aspects of arc instability in an SG-100 spray torch. In such arcs, owing to inherent demixing processes, the boundary layer and the core of the plasma column are dominated by hydrogen and argon respectively. Therefore, associated variations in instability features due to variation...
Summary form only given. A stable uniform, long-slit atmospheric argon plasma is produced by coupling a longitudinal section electric (LSE) mode in a dielectric loaded rectangular waveguide. The microwave-induced plasma discharge system consists of a 2.45 GHz microwave source, circulator, 3-stub tuner, transformer, and tapered rectangular waveguide loaded with two dielectric slabs. A uniform 98 mm...
Summary form only given. An easily-run plasma generator is presented to generate a novel kind of atmospheric cold plasma millimeter jet. The jet is achieved in several kinds of gases at atmosphere pressure, such as Ar, He and N2, in a capillary quartz dielectric barrier discharge (DBD) system powered by a sinuous power source with frequency of 33 kHz. There are two different discharge regions in the...
Summary form only given. The phenomenon of instabilities in a low pressure inductively coupled Ar plasma has been characterized by using various diagnostic tools, including a home-made RF impedance meter, a Langmuir probe, and optical emission spectroscopy. The impedance meter was designed to extract fast variations in amplitudes of RF voltage, current and phase. It consisted of voltage and current...
Summary form only given. Neon and argon were used as load gas for the Z-pinch experiments on the "yang" accelerator at IFP. And different sets of nozzles were tried out. An ultrafast multi-frame soft X-ray CCD camera was used in these experiments, which can get 10 frames with 10 ns time interval of pinch process at each pinch experiment. Time-integral X-ray pinhole camera and visible streak...
Summary form only given. The aim of this work is to investigate by means of a 3-D numerical model the fluid flow and temperature distribution of a plasma transferred electric arc discharge generated between two suspended metallic electrodes. This twin torch device is used inside a plasma furnace for hazardous waste incineration and asbestos inertization. Flow and energy equations are solved for an...
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