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The performance of a newly built omega type electrostatic analyzer designedto act as an in-line charge-state purification system for ions in the keVenergy range is reported. The analyzer consists of a set of four consecutiveelectrostatic 140{\deg} concentric cylindrical electrodes enclosed by Matsudaelectrodes. This setup was recently tested and validated using $O^{5+}$ ,$Ar^{9+}$ and $Xe^{20+}$ ion beams at an energy of 14 qkeV at the ARIBEfacility. A resolving power of 10.5 and a transmission of 100 % of the desiredcharge state are measured allowing a good purification of incoming ion beamswith charge states up to 10+ and a fairly good purification for charge statesat least up to 20+. In comparison with other in-line solutions such as Wienfilter, our system has the advantage of being purely electrostatic andtherefore lacking common drawbacks as for example hysteresis.

An electrostatic in-line charge-state purification system for multicharged ions in the kiloelectronvolt energy range