the role of low-pressure rf plasma in the inactivation of escherichia coli o157, klebsiella pneumoniae, proteus mirabilis, and enterobacter sakazakii using n2-o2 and sf6 gases was assessed. 1×109 colony-forming units (cfus) of each bacterial isolate were placed on three polymer foils. the effects of pressure, power, distance from the source, and exposure time to plasma gases were optimized. the...

The design and preliminary testing of a waveguide electron cyclotron resonance (ECR) heated plasma source is presented in this paper. The design utilizes resonant absorption of traveling microwaves to heat the discharge, avoiding any lifetime constraints on the device due to barium depletion or ion bombardment in more conventional devices. Results from magnetostatic calculations are presented, ...

There are regimes of plasma source operation in which the ion motion is controlled by the ambipolar electric eld and ion-atom collisions. This paper presents a derivation of the corresponding ion distribution function and plasma density pro les in the source for a given electron temperature and a given gas ionization rate. Conditions are discussed under which the ion ux is predominantly radial ...

A simplified vacuum arc design [based on metal vapor vacuum arc (MeVVA) concepts] is employed as a plasma source for a study of a (7)Be non-neutral plasma. The design includes a mechanism for interchanging the cathode source. Testing of the plasma source showed that it is capable of producing on the order of 10(12) charges at confinable energies using a boron-carbide disk as the cathode target....

There is interest in using a helicon plasma source in propulsive applications as both an ion source and as a thruster. Developing a helicon thruster requires a performance baseline as a basis for future optimization and expansion. The thrust of a helicon is measured using an null-type inverted pendulum thrust stand at a pressure of 2x10 -5 Torr through the operating range of 215-840 W RF power,...