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Recently a great attention is attracted to the creation of the small size nonequilibrium atmospheric plasma jets and their interaction with living tissue. This facilitates the development of appropriate tools for their diagnostics. The diagnostic tools that have been traditionally utilized for characterization of cold nonequilibrium atmospheric plasma jets include intensified charge-coupled device...
Diagnostic of the edge region, called scrape-off layer (SOL) of tokamak plasma is of great interest because the research on the SOL plays an important role in understanding discharge characteristics between the plasma facing components and core region. For this reason, plasma diagnostics have been developed and adapted to the fusion plasma with high time resolution and small perturbation. Recently,...
Due to the short time of neutron pulses produced in PF, counting these pulses is the most important technical challenge in the field of neutron diagnostics. In this context, many counters and detectors have been designed, as can be noted the activation counters, Geiger Muller and scintillator detectors. Activation counters, count the number of produced neutrons, but the time variation of neutron emission...
The effects of varying aperture size and gas flow rate on the output electron current, distribution of ion energies and resulting thrust of a piezoelectric plasma propulsion system are assessed. An rf driven lithium niobate crystal was used to generate the plasma in a small vacuum chamber pressurized with argon gas. Flow rates of the argon gas and aperture diameters were independently varied to determine...
Determining the electric potential configuration of a biased electrode immersed in plasma in any point away from its symmetry axis is of great importance for the physics of plasmas. Our purpose is to explain how the electrode's potential independently (only in the presence of the unperturbed plasma) can influence the experimentally measured potential profiles of some complex structures that may emerge...
Fast plasma heating in a multi-mirror magnetic trap by a high-current beam of relativistic electrons is a promising way to achieve fusion-grade plasma parameters. A high-level Langmuir turbulence develops during the beam-plasma interaction. These high-energy-density plasma oscillations can generate electromagnetic (EM) radiation in a wide frequency range extending from the plasma frequency to its...
Research on terahertz wave transmission through plasma is significant for researches on plasma itself and transmission discipline of terahertz wave through plasma. It is possible for plasma with suitable density to be an available stealth outerwear for plane or missile in THz waveband. In this paper, plasma is gotten by ionizing inert gases such as argon and helium gases with pulsed high alternating...
In order to plasma generators and its parameter importance, in this paper firstly an inductively type plasma generators has been defined in COMSOL[6] software, then by changing plasma inputs such as Pressure, Coil Current and Working Frequency, plasma parameters have been simulated. Finally with these results, Total Electron Density Rate for various conditions has been investigated and compared with...
Reactive oxygen and nitrogen species (RONS) have been shown to play important roles in various fields, including medical treatment (e.g. cancer and chronic wounds), food preservation, and water purification. It is well established that atmospheric pressure plasmas generate a wide variety of RONS in air near room temperature, including O2*, O3, OH, O, and NO. Those highly reactive species are hard...
Water safety regarding residual radicals as a result of water exposure to non-thermal plasma (NTP) is reported using single-molecule measurements. In this study the kinetic of strand breakages of large DNA molecules suspended in water exposed to an argon plasma jet was analyzed1. The single molecule measurements investigation was also conducted on pure water after post exposure to plasma. Results...
Plasma processes, particularly plasma etching and plasma deposition processes are crucial for a large variety of industrial manufacturing processes. For these processes the knowledge of the ion energy distribution function plays a key role. Measurements of the ion energy distribution function (IEDF) are at least challenging and often impossible in industrial processes. An alternative to measurements...
Given that the development of future plasma energetics depends on the application and control of nonequlibrium, anisotropic electron energy distribution functions (EEDF) in plasmas, the development of methods to measure and control EEDF is of great importance.
A radiofrequency plasma source was previously developed at the University of Michigan to study the behavior of ions downstream of a diverging magnetic field.1,2 A follow-up experiment investigates the performance of the plasma source operating as a thruster. During this experiment, simultaneous thruster performance and far-field plume measurements of the rf plasma source are taken in the Large Vacuum...
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