Modeling of plasma transport and negative ion extraction in a magnetized radio-frequency plasma source

Ion kinetics in a magnetized plasma source

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 ...

Modified extraction geometry in a radio-frequency ion source

2014 This paper is to show that a number of plausible arguments supporting the use of Bayly and Ward’s extraction geometry in radio-frequency ion source can be put forward. The ThonemannHarrison and the Schmidt-Eyrich version of this method have been compared in a series of measurements from the points of view of working parameters and beam characteristics. Current, gas supply rate, mass spectr...

Production of large-volume negative-ion source using multistring-type CF4 magnetized plasma

Dissociation of Co2 in a Radio-frequency Plasma Source

Current dependence on fossil fuels to satisfy increasing energy needs has created an overabundance of CO2 emissions. This project aims to use a radio frequency (rf) plasma source to dissociate CO2 completely into solid carbon and gaseous oxygen to reduce CO2 concentrations in the atmosphere. An rf plasma excited by a double helix antenna with an axial magnetic field is used to create the CO2 di...

Thrust Measurements of a Radio Frequency Plasma Source

There is interest in the use of a heliconplasma source in propulsive applications as both an ion source anda thruster. Development of a helicon thruster requires a performance baseline as a basis for future optimization and modification. For the first time, the thrust of a helicon plasma source ismeasured using a null-type inverted pendulum thrust stand at an operating pressure of 2 × 10−5 torr...