ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A microwave plasma cathode (MPC) was developed to replace the thermionic filaments of the cold or hot reflex discharge ion source (CHORDIS) ion source for operation with reactive gases. Experiments with our MPC showed its long lifetime and its capability of high-current electron emission. Two new types of antennae are presented. Different electron extraction apertures were used, but the best results were obtained with an extraction aperture of 6 mm in diameter. Ion beam currents for different oxygen pressures and different discharge voltages are presented and discussed. The gas pressure proved to be a critical parameter in respect to the extracted ion beam densities and beam noise. Total ion current densities of 16.8 mA/cm2 were obtained for oxygen. We are also presenting an experiment where the MPC-CHORDIS system was used as a tool to study the influence of the beam noise on the space charge compensation at the GSI Darmstadt injection beam line. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1150360
