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Second harmonic modes observed in the 250 GHz gyrotron
| Mode | Frequency (GHz) | Magnetic field (T) | Voltage (kV) | Start current (mA) |
|---|---|---|---|---|
| TE2,4,1 | 323.67 | 5.84 | 7.3 | 12 |
| TE0,4,1 | 327.41 | 5.90 | 7.8 | 15 |
| TE3,4,1 | 358.42 | 6.48 | 8.6 | 15 |
| TE3,4,2 | 358.81 | 6.50 | 8.6 | 47 |
| TE1,5,1 | 365.26 | 6.60 | 8.8 | - |
