6533b873fe1ef96bd12d55ec
RESEARCH PRODUCT
Studies of plasma breakdown and electron heating on a 14 GHz ECR ion source through measurement of plasma bremsstrahlung
J. NolandOlli TarvainenVadim SkalygaTaneli KalvasDaniela LeitnerPauli PeuraT. RopponenH. KoivistoV. G. ZorinPeter M. JonesVille ToivanenIvan IzotovGuillaume Machicoanesubject
Electron densityChemistryTemporal resolutionBremsstrahlungPlasmaElectronAtomic physicsPhoton energyCondensed Matter PhysicsElectron cyclotron resonanceIon sourcedescription
Temporal evolution of plasma bremsstrahlung emitted by a 14?GHz electron cyclotron resonance ion source (ECRIS) operated in pulsed mode is presented in the energy range 1.5?400?keV with 100??s resolution. Such a high temporal resolution together with this energy range has never been measured before with an ECRIS. Data are presented as a function of microwave power, neutral gas pressure, magnetic field configuration and seed electron density. The saturation time of the bremsstrahlung count rate is almost independent of the photon energy up to 100?keV and exhibits similar characteristics with the neutral gas balance. The average photon energy during the plasma breakdown is significantly higher than that during the steady state and depends strongly on the density of seed electrons. The results are consistent with a theoretical model describing the evolution of the electron energy distribution function during the preglow transient.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-08-19 | Plasma Sources Science and Technology |