New Superembeddings for Type II Superstrings

Possible ways of generalization of the superembedding approach for the supersurfaces with the number of Grassmann directions being less than the half of that for the target superspace are considered on example of Type II superstrings. Focus is on n=(1,1) superworldsheet embedded into D=10 Type II superspace that is of the interest for establishing a relation with the NSR string.Comment: 26 pages, LaTeX, JHEP.cls and JHEP.bst style files are used; v2: misprints corrected, comments, acknowledgments, references adde

Mathematical Simulation of a High-Frequency Low-Pressure Discharge with Gas Injection in Non-Local Approximation: Electro- and Plasmadynamics

The electro- and plasmadynamic parameters of a high-frequency discharge at a low pressure (13.3–200 Pa) with a gas blowing-through are investigated in a nonlocal approximation. A discharge in a cylindrical discharge tube in a medium of argon is considered. The flow at the beginning of the discharge tube occurs in the regime of a continuous medium, whereas in the region of a plasma bunch and further downstream the flow regime changes to a freemolecular one. In this connection, a hybrid mathematical model is constructed that includes the Boltzmann equation for a neutral gas and the balance equations of the concentration and energy of electrons in the continuous medium approximation. The equations for the plasma particles are supplemented by the Maxwell equations transformed into the equations of telegraphy in the high-frequency electric intensity. The results of calculations of the electric intensity, concentration of electrons, and of electron temperature in the discharge tube are presented. It is shown that account for the nonlocality is an essential factor in simulating the high-frequency inductive discharge with gas injection ensuring effective transfer of charged particles from the field of their generation to the working chamber

Calculation of conditions for maintaining an ICRF-plasma using a self-consistent model

The article proposes a new approach to calculating the strength of the magnetic field on the inner wall of the discharge chamber, which is necessary to maintain a steady state of a low-pressure ICRF discharge. The model is treate as a nonlinear eigenproblem. The influence of the third type boundary conditions for electron density as well as and the nonlinear boundary conditions for electrical strength is considered. This approach makes it possible solving two problems of designing ICRF plasma torches: for a given electron density in the discharge find the magnetic field strength that ensures the maintenance of the discharge, or, conversely, at a given magnetic field strength, determine the value of the electron density that can be created in the discharge. In addition, the radial distributions of the electric and magnetic fields and the electron concentration can be determined

Study of RF plasma flow at low pressure: Electron temperature influence

© 2020 Published under licence by IOP Publishing Ltd. A mathematical model of low-pressure RF plasma flow taking into consideration electron temperature influence is presented. Results of calculations of carrier gas velocity, pressure and temperature as well as electron density and electron temperature in plasma flow are showed. Influence of electric field on electron temperature and plasma flow is analyzed

Experimental installation to study the RF plasma flow at low pressures with experiment data synchronization

© 2020 Published under licence by IOP Publishing Ltd. A diagram and description of an experimental setup for studying the properties of a stream of RF plasma at low pressure are presented. The setup is equipped with diagnostic devices that record the temperature, volt-ampere characteristics, and pressure in the chamber