| 摘要 |
Multicharged ion source with several electron cyclotron resonance zones. The source comprises a sealed enclosure containing a gas for forming a plasma confined in said enclosure, means for producing a high frequency electromagnetic field within the enclosure, means for producing within the enclosure a group of radial and axial, local magnetic fields and defining equimagnetic surfaces permitting the confinement of the plasma on one of these surfaces, the electron cyclotron resonance condition being satisfied, the group having an axis of symmetry, means for extracting the ions through the orifice made in the wall of the enclosure and located on the axis of symmetry and means for reducing, outside the volume occupied by the plasma, the amplitude of the local axial magnetic fields in the vicinity of and slightly upstream of the extraction orifice in n zones located outside the axis, so that new ionizing electron cyclotron resonances appear in these zones. |
