| 摘要 |
The invention relates to betatron (1), especially in X-ray testing appara tus, comprising a rotationally symmetrical inner yoke consisting of two inte rspaced parts (2a, 2b), an outer yoke (4) connecting the two inner yoke part s (2a, 2b), at least one main field coil (6a, 6b), a toroidal betatron tube (5) arranged between the opposing front sides of the inner yoke parts (2a, 2 b), and at least one contraction and expansion coil (CE coil; 7a, 7b). An in dividual CE coil (7a, 7b) is respectively arranged between the front side of the inner yoke part (2a, 2b) and the betatron tube (5), and the radius of t he CE coil (7a, 7b) is essentially the same as the nominal orbital radius of the electrons in the betatron tube (5).
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