The goal of the lower hybrid current drive (LHCD) program on Alcator C-Mod is to develop and optimize ITERrelevant steady-state plasmas by controlling the current density profile. Using a 4x16 waveguide array, over 1 MW of LH power at 4.6 GHz has been successfully coupled to the plasmas. However, current drive efficiency precipitously drops as the line averaged density (ne) increases above 1020...

This work presents an analysis of the influence connector repeatability in three different methods for estimating propagation constant transmission lines from two-port measurements. For this purpose, 16 transitions using 1.85-mm coaxial-to-microstrip end-launcher connectors has been tested. It shown that same pair instead whole set significantly reduces standard deviation transition S-parameter...

Two launch vehicle concepts based on technologies available today or in a short term future in Western Europe are presented. The design of both launchers has the goal of exploiting synergies with current European programs to limit development and operational costs. Technologies of particular interest here are the high performance solid rocket motors with carbon-epoxy filament wound monolithic m...

An improvement to the load-pull technique for a large-signal design of a transistor amplifier is proposed. On the contrary to the current load-pull technique – a smallsignal pre-matching on the output of the transistor is applied which results in reduced demands on a maximum VSWR of the tuner. This minimizes the launcher radiation in the K band and reduces measurement uncertainty. The proposed ...

The ever-widening applications of numerical calculations leads to a variety of new numerical methods, which are di erent in their solution algorithms as well as in the discretization of the governing equations. Despite this development, much work still remains in their improvement towards a fast, accurate and stable convergence. This work shows a numerical method for the solution of compressibl...

background and objectives: electric, magnetic and electromagnetic fields can act as stress factors with different effects on biological systems. due to the nutritional and medicinal values, and the increasing electromagnetic radiations, the present study was performed to investigate the effects of the electromagnetic field on the developmental stages and cytotoxic properties of okra. methods: b...

background: with increased use of computers, exposure to electric and magnetic fields is increasing, the main objective of this study was to evaluate the electric and magnetic field strength in portable computers (laptops) and its relation with eyestrain users. methods: in this cross – sectional study, magnetic and electric fields in 125 laptop computers were measured from 30 cm and 50 cm dista...

Diamond growth at low temperatures (?400 °C) and over large areas is attractive for materials, which are sensitive to high require good electronic, chemical or surface tribological properties. Resonant-cavity microwave plasma enhanced (MWPE) vapor deposition (CVD) a standard method growing diamonds, however, with limited area. An alternative CVD of diamond area temperature use wave (SWP). In th...