Magnetron injection gun for a broadband gyrotron backward-wave oscillator
- Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan (China)
- Department of Electro-Optical Engineering, Southern Taiwan University, Tainan 710, Taiwan (China)
The magnetron injection gun is capable of generating relativistic electron beam with high velocity ratio and low velocity spread for a gyrotron backward-wave oscillator (gyro-BWO). However, the velocity ratio ({alpha}) varies drastically against both the magnetic field and the beam voltage, which significantly limits the tuning bandwidth of a gyro-BWO. This study remedies this drawback by adding a variable trim field to adjust the magnetic compression ratio when changing the operating conditions. Theoretical results obtained by employing a two-dimensional electron gun code (EGUN) demonstrate a constant velocity ratio of 1.5 with a low axial velocity spread of 6% from 3.4-4.8 Tesla. These results are compared with a three-dimensional particle-tracing code (computer simulation technology, CST). The underlying physics for constant {alpha} will be discussed in depth.
- OSTI ID:
- 21277326
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 7; Other Information: DOI: 10.1063/1.3187903; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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