Abstract
The high compression rate electron gun and uniform magnetic focusing system, dedicated to the W-band extended interaction klystron(EIK), were designed. The negative effect of the ferromagnetic alloy, or kovar alloy used to weld ceramic to metals, on the magnetic field in the gun area and on the electron beam transition was investigated. The dependence of the magnetic field at the gun area on the focusing magnetic field was simulated with software SUPERFISH, and experimentally evaluated. The simulated results were found to be in consistent with the measured data. In addition, two technically feasible modifications of the design were proposed: one is to enlarge the hole of the soft-iron shielding pole; the other is to partially substitute stainless steel for ferromagnetic alloy. Fabricated with partial substitution scheme, the compression rate and electron beam diameter of the newly-developed electron gun reached 120 and 0.26 mm, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 819-823 |
| Number of pages | 5 |
| Journal | Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology |
| Volume | 34 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1 Aug 2014 |
| Externally published | Yes |
Keywords
- Distributed interaction klystron
- Electron optics
- High compression rate
- W-band
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