Travelling-Wave Tube, Electron Gun, and Power Amplification System

An electron gun comprising:

• a control circuit configured to determine a quantity of N electron beams and currents of the N electron beams, wherein N is a positive integer greater than or equal to 1;
• and
• M cathodes, wherein N cathodes in the M cathodes are configured to emit the N electron beams under control of the control circuit,
• wherein each of the N cathodes is configured to emit one of the N electron beams, and
• wherein M is greater than or equal to N.

A power amplification system comprising:

• a first signal processor configured to input a radio frequency signal;
• and
• a travelling-wave tube coupled to the first signal processor, wherein the travelling-wave tube is configured to:
• receive the radio frequency signal from the first signal processor;
• and
• amplify power of the radio frequency signal,
• wherein the travelling-wave tube comprises:
• one or more electron guns;
• a control circuit configured to:
• determine a quantity of N electron beams and currents of the N electron beams;
• and
• control the one or more electron guns to emit the N electron beams;
• and
• a slow-wave circuit configured to perform beam-wave interaction with the N electron beams.