6533b825fe1ef96bd1282048
RESEARCH PRODUCT
Cyclotron instability in the afterglow mode of minimum-B ECRIS.
Hannu KoivistoOlli TarvainenTaneli KalvasVadim SkalygaJanne LaulainenJ. KomppulaDmitry MansfeldIvan IzotovRisto Kronholmsubject
010302 applied physicsPhysicsta114ta213Astrophysics::High Energy Astrophysical Phenomenaplasma instabilityCyclotronBremsstrahlungPlasma01 natural sciencesInstabilityIon sourceElectron cyclotron resonance010305 fluids & plasmaslaw.inventionTwo-stream instabilityPhysics::Plasma Physicslaw0103 physical scienceselectron cyclotron resonance ion sourcesAtomic physicsInstrumentationIon cyclotron resonancedescription
It was shown recently that cyclotron instability in non-equilibrium plasma of a minimum-B electron cyclotron resonance ion source (ECRIS) causes perturbation of the extracted ion current and generation of strong bursts of bremsstrahlung emission, which limit the performance of the ion source. The present work is devoted to the dynamic regimes of plasma instability in ECRIS operated in pulsed mode. Instability develops in decaying plasma shortly after heating microwaves are switched off and manifests itself in the form of powerful pulses of electromagnetic emission associated with precipitation of high energy electrons. Time-resolved measurements of microwave emission bursts are presented. It was found that even in various gases (helium and oxygen were studied) and at different values of magnetic field and heating power, the dynamic spectra demonstrate common features: decreasing frequency within a single burst as well as from one burst to another. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-01 | The Review of scientific instruments |