| 摘要 |
The leakage field of the c.r.t (3) is composed of dipole and quadrupole fields. A dipole compensation field is generated by a first compensation loop (7) and a quadrupole compensation field by a second loop (9). The first loop is flat and at right angles to the magnetic deflecting field (B). The second loop is also flat and at right angles to the longitudinal symmetrical axis (Z) of the c.r.t. and has upper (9a) and lower (9a) parts which generate two mutually opposing dipole fields (DK2,DK3). The centres of gravity (TP1, TP2) of the loops lie on the symmetrical axis (Z) respectively at the forward edge (6) of the funnel-like casing (4) and the forward part of the deflecting coil (1). The compensation loops are connected in series with the deflecting coil. |
