Patent ID: 6194836
Filing Date: 2001-02-27
Classification: H01J

Abstract:
Electronic cyclotronic resonance source with:magnetic means of generating a magnetic field in a cavity delimited by these means, the cavity having an axial direction along an axis AA and a radial direction;means of injecting an HF wave into the said cavity, the HF wave and the magnetic field created by the magnetic means ensuring that an electronic cyclotronic resonance condition is maintained in the cavity;means of injecting gases into the cavity the source being characterized in that the magnetic means comprise:first magnetic means (M.sub.3) comprising a number N.sub.1 of elements (62-1, 62-2, 62-3, 62-4), where N.sub.1 is an integer number .gtoreq.0, the N.sub.1 elements together forming an axial magnetic structure;second magnetic means (M.sub.1, M.sub.2) each comprising N.sub.2 elements (64-2 . . . 64-5; 66-2, . . . 66-4) where N.sub.2 is an integer number .gtoreq.0 together forming a radial magnetic structure, these elements (64-2 . . . 64-5; 66-2 . . . 66-4), being in the form of rings (64-2 . . . 64-5; 66-2, . . . 66-4), the rings of each of the subsets ebing nested inside each other and the vector sum of the fields created by the first (M.sub.3) and the second (M.sub.1, M.sub.2) magnetic means being used to define at least one closed line of minima of the modulus B of the vector sum, inside one or several volumes inside the cavity and delimited by the surfaces with constant modulus B.sub.f in the magnetic field.