| 摘要 |
In order to make fine adjustments to the magnetic field strength between the pole pieces 14, 15 of a magnetron, the magnetron is provided with a movable mass of magnetically permeable material such as a slider 20, which is slidable in a tangential direction over the surface of the outer casing 16 of the anode. The slider can be locked in position when a desired adjustment of the magnetic field has been achieved. Alternative movable masses are rotary members.
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