| CPC H01J 37/3455 (2013.01) [C23C 14/35 (2013.01); H01J 37/3405 (2013.01); H01J 37/342 (2013.01)] | 20 Claims |

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1. A magnet system comprising:
a housing comprising a housing interior;
a magnet holder arranged in the housing interior and rigidly attached to the housing; and
a housing cover which, when assembled with the housing, forms a fluid-tight chamber, wherein the housing cover comprises:
a gear stage;
a generator; and
a rotary coupling that couples the gear stage to the generator.
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