Fig. 1. Waveform of heater current fluctuation

Fig. 2. Sketch map of cathode-heater assembly

Fig. 3. Heater double-helix substructure

Fig. 4. Sketch map of heater lead leg

Fig. 5. Equivalent circuit of heater assembly

Fig. 6. Block diagram of natural frequency for cathode-heater assembly

Fig. 7. Samples (1#～7#) of cathode-heater assembly

Fig. 8. Vibration spectrum of cathode-heater assembly samples

Fig. 9. X-ray photo of cathode-heater assembly

Fig. 10. Parallel equivalent circuit after adding a contact point

Fig. 11. Schematic diagram of the electromagnetic induction force of heater

Fig. 12. Control interface of heater current on/off test software