Performance test of omegatrons with electrode structures of box-type and guard-ring-type were carried out in approximately uniform magnetic field ranging from 2, 000 gauss to 10, 000 gauss. It was confirmed that the resolving power was in comparatively good accord with the theoretical value. When the magnetic field was 10, 000 gauss and the r-f potential was 2 volts, the resolving power of our omegatron with guard-ring-type structure was 65 for the ion mass of 65. The behavior of an ion in nonuniform magnetic field with axially symmetric distribution was examined analy tically. The result shows that such nonuniformity does not disturb the performance of the omegatron, and further more would improve the resolving power. This lead to the conclusion that a relatively small-sized magnet can be applied for the practical use of the omegatron. However, viewing from our practical experiences, the weakness of magnetic field imposes limitations on the performance of omegatron. As the magnetic field was intensified, the higher resolving power was obtained with ease of adjustment, with good stability, and without injuring the sensitivity. As for the electrode structure, the adjustment of conditions for the performance of box-type omegatrons seems to be more critical than for the guard-ring-type omegatron. However, a number of experimental tubes must be examined to arrive at a conclusion. The potential distributions of r-f electoric field in the omegatron were measured by means of the electrolytic tank method.
抄録全体を表示