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  • 1
    Electronic Resource
    Electronic Resource
    Limitations to the plasma energy and density in electron cyclotron resonance ion sources (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3408-3415 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron Cyclotron Resonance (ECR) plasmas are generated by the resonant interaction of a high-frequency (hf) wave with the electrons of the plasma close to the electron Larmor frequency. At high hf power the collisional relaxation is not sufficient to thermalize the electrons and a complex Electron Distribution Function (EDF) is generated. In ECR Ion Sources (ECRIS), dedicated to the production of Highly Charged Ions (HCI), such a hot electron component is required to ionize the atoms to very high charged states; in this paper experiments on the electron population are presented. It is shown that ECRIS plasmas are very far from thermal equilibrium; which is necessary for the production of HCI; the observed saturation of the performances (in electron energy and density, and ion charge state) can be explained by the wave–plasma interaction itself: low-energy electrons interact primarily with the electric field of the wave, whereas the high-energy component experiences mainly pitch-angle scattering due to the interaction with the magnetic field of the wave, which becomes dominant. A simple model, consistent with the results obtained in the domain of strong hf power, is developed. This model explains the saturation phenomena encountered. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873581
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of low-frequency oscillations in heavy ion plasmas heated by electron cyclotron resonance (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4307-4309 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved experiments (bremsstrahlung, diamagnetism, electron, and ion end-loss currents) have been carried out at the Electron Cyclotron Resonance Ion Source Quadrumafios [A. Girard, et al., Rev. Sci. Instrum. 65, 1714 (1994)] continuously operated with heavy neutral gases. All the diagnostics reveal oscillations (on the time scale of about 1 s) which could be characterized by variations of the hot electron perpendicular temperature. The onset of this low-frequency periodic regime with increasing heating powers and/or decreasing gas injection pressures is shown to limit the highly charged ion currents available. The addition of a lighter gas, e.g., He into Kr, delays the appearance of the periodic regime and enables one to extract higher currents. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871961
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    Paper (German National Licenses)
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