6533b82efe1ef96bd1293e8f

RESEARCH PRODUCT

Limitation of the ECRIS performance by kinetic plasma instabilities (invited).

Guillaume MachicoaneRisto KronholmHannu KoivistoTaneli KalvasJ. KomppulaDmitry MansfeldVadim SkalygaJanne LaulainenOlli TarvainenIvan IzotovV. Toivanen

subject

Physicsta114OscillationMagnetic confinement fusionPlasmaElectron01 natural sciencesplasma electronsElectron cyclotron resonanceIon source010305 fluids & plasmasIon0103 physical scienceselectron cyclotron resonance ion sourceskinetic instabilitiesAtomic physics010306 general physicsInstrumentationBeam (structure)

description

Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due to anisotropic electron velocity distribution. The instabilities are associated with strong microwave emission and periodic bursts of energetic electrons escaping the magnetic confinement. The instabilities explain the periodic ms-scale oscillation of the extracted beam current observed with several high performance ECRISs and restrict the parameter space available for the optimization of extracted beam currents of highly charged ions. Experiments with the JYFL 14 GHz ECRIS have demonstrated that due to the instabilities the optimum Bmin-field is less than 0.8BECR, which is the value suggested by the semiempirical scaling laws guiding the design of ECRISs. peerReviewed

yearjournalcountryeditionlanguage
2016-01-01The Review of scientific instruments
10.1063/1.4931716https://pubmed.ncbi.nlm.nih.gov/26931921