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Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

1995

Electrical and Computer Engineering ETDs

Articles 1 - 2 of 2

Full-Text Articles in Engineering

Construction And Characterization Of An Extended Helicon Plasma Source, Russell Ford Jewett Jr. Sep 1995

Construction And Characterization Of An Extended Helicon Plasma Source, Russell Ford Jewett Jr.

Electrical and Computer Engineering ETDs

A new helicon source has been developed for plasma processing applications. The source is a modification of the traditional cylindrical helicon source design to rectangular geometry. In order to accomplish this, the antenna used for launching helicon waves is stretched in the direction perpendicular to the static magnetic field lines. This source was coupled to a long rectangular slab chamber which is used for the actual material processing. A static magnetic field of -200 Gauss peak strength, pointing out from the source into the diffusion region, was applied to facilitate helicon wave propagation. 13.56 MHz rf power was used ...


Effects Of Varying Coupling Impedance, Finite Length, And Asynchronous Harmonics On High Power Bwo Performance, Larald Dean Moreland Apr 1995

Effects Of Varying Coupling Impedance, Finite Length, And Asynchronous Harmonics On High Power Bwo Performance, Larald Dean Moreland

Electrical and Computer Engineering ETDs

A systematic study of high power backward wave oscillators (BWOs) was performed using the Sinus-6 repetitively-pulsed relativistic electron beam accelerator. Peak output power of up to 550 MW was measured in a frequency range of 9.2 to 9.8 GHz with pulse lengths up to 10 ns. The experimental results were compared with numerical simulations using TWOQUICK, a 2.5 D, relativistic, fully electromagnetic, particle-in-cell (PIC) code. It was observed that a significant increase in microwave efficiency can be obtained by using a BWO with a spatially varying coupling impedance instead of the traditional uniform distribution. Based on experiments ...