| 摘要 |
The present invention relates to multistage vacuum collectors for ultra-high frequency tubes. Each electrode of the collector comprises two walls which are axially symmetrical with respect to the beam propagation axis and which are superimposed along said axis. The retarding path of the electrons due to the decreasing potentials of the electrodes is thus located in a small volume space between the facing walls of two adjacent electrodes. A plurality of permanent magnets positioned outside the vacuum enclosure above the final electrode produce an asymmetrical magnetic field with respect to the propagation axis. Application to travelling-wave tubes and klystrons. |
