6533b822fe1ef96bd127cea7

RESEARCH PRODUCT

The effect of microwave power on the Ar9+ and Ar13+ optical emission intensities and ion beam currents in ECRIS

Janne LaulainenM. SakildienOlli TarvainenPeter B. JonesTaneli KalvasDerek NebenRisto KronholmHannu Koivisto

subject

Materials scienceIon beamspektroskopiaplasmatekniikka7. Clean energy01 natural sciencesIonAmplitude modulationoptical emission spectroscopymikroaallotPhysics::Plasma Physics0103 physical sciences010306 general physicsplasma (kaasut)plasma010302 applied physicsta114ionitsyklotronitPlasmaCore (optical fiber)ionsPhysics::Accelerator PhysicsOptical emission spectroscopyAtomic physicsCurrent (fluid)Beam (structure)

description

The production of Ar9+ and Ar13+ ions in an ECRIS plasma and the efficiency of the ion beam extraction and transport of the resulting Ar9+ and Ar13+ ion beams have been studied with the JYFL 14 GHz ECRIS by using optical emission spectroscopy and measurement of the m/q analyzed beam currents. The relative changes in both the optical emission and the ion beam current in CW mode as function of microwave power and in amplitude modulation (AM) operation mode are reported. The results indicate a discrepancy between the parametric dependence of high charge state ion densities in the core plasma and their extracted beam currents. The observation implies that in CW mode the ion currents could be limited by diffusion transport and electrostatic confinement of the ions rather than beam formation in the extraction region and subsequent transport. peerReviewed

yearjournalcountryeditionlanguage
2018-01-01
10.1063/1.5053288https://doi.org/10.1063/1.5053288