CST – Computer Simulation Technology

Magnetron injection gun for a broadband gyrotron backward-wave oscillator
C. P. Yuan, T. H. Chang, N. C. Chen, Y. S. Yeh
Physics of Plasmas
Juli 2009
073109-1 - 073109-6
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 (a) 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  will be discussed in depth

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