| 摘要 |
Geometry correction adapted to the defects generated by a uniform magnetic field deflector. The correction means (4) includes eight windings (14) to (21) arranged inside a magnetic circuit (13) and supplied in series by a direct current source. Four variable resistors are connected in parallel on the pairs of adjacent windings (14, 15), (16, 17), (18, 19), (20, 21). <IMAGE>
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