We describe the results of investigations of the suitability of the electrostatic plasma lens as a focusing element in the low-energy injection beam lines of particle accelerators. We have explored the focusing of high-current, wide-aperture, heavy-ion beams by a plasma lens. The results indicate that for optimal focusing conditions the lens does not increase the beam emittance nor the beam noise. The ion current density was increased by a factor of 30, up to 250 mA/ cm 2 in the work described here. We project that with an optimized ion extraction system, the plasma lens can provide an ion-beam current density of up to 400 mA/ cm 2 or more.
A very simple design of cathodic filtered vacuum arc plasma source is proposed. The source without filter has only four components and none of them require precise machining. The source operates in a repetitively pulsed regime, and for laboratory experiments it can be used without water cooling. Despite the simple construction, the source provides high ion current at the filter outlet reaching 2.5% of 400 A arc current, revealing stable operation in a wide pressure range from high vacuum to oxygen pressure up to more than 10(-2) mbar. There is no need in complicated power supply system for this plasma source, only one power supply can be used to ignite the arc, to provide the current for the arc itself, to generate the magnetic field in the filter, and provide its positive electric biasing without any additional high power resistance.
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