Vacuum electron device drift tube

A vacuum electron device, comprising:

• a hollow tube structure comprising:
• at least two resonant cavities, each resonant cavity includes a cavity width along a major axis, a cavity height along a minor axis, and a cavity length along a propagation axis, and the major axis is substantially orthogonal to the minor axis;
• at least one drift tube section in a drift tube that includes at least two drift tube section widths along the major axis, a drift tube section height along the minor axis, and a drift tube section length along the propagation axis, the cavity height is greater than the drift tube section height;
• a first drift tube section of the at least one drift tube sections is disposed between a first resonant cavity and a second resonant cavity of the at least two resonant cavities;
• and
• a first drift tube section width of the at least one drift tube section is substantially different from a second drift tube section width of the at least one drift tube section.

A vacuum electron device, comprising:

• a hollow tube structure comprising:
• at least three resonant cavities, each resonant cavity includes a cavity width along a major axis, a cavity height along a minor axis, and a cavity length along a propagation axis, and the major axis is substantially orthogonal to the minor axis;
• at least two drift tube sections, each drift tube section includes a drift tube section width along the major axis, a drift tube section height along the minor axis, and a drift tube section length along the propagation axis, and the cavity height is greater than the drift tube section height;
• a first drift tube section of the at least two drift tube sections is disposed between a first resonant cavity and a second resonant cavity of the at least three resonant cavities;
• a second drift tube section of the at least two drift tube sections is disposed between the second resonant cavity and a third resonant cavity of the at least three resonant cavities;
• and
• a drift tube section length of the first drift tube section is substantially different from a drift tube section length of the second drift tube section, wherein the first drift tube section and the second drift tube section are not a drift tube between a penultimate resonant cavity and a last resonant cavity.

A vacuum electron device, comprising:

• a hollow tube structure comprising:
• at least three resonant cavities, each resonant cavity includes a cavity width along a major axis, a cavity height along a minor axis, and a cavity length along a propagation axis, and the major axis is substantially orthogonal to the minor axis;
• at least two drift tube sections in a drift tube that include a drift tube material, each drift tube section includes a drift tube section width along the major axis, a drift tube section height along the minor axis, and a drift tube section length along the propagation axis, and the cavity height is greater than the drift tube section height;
• a first drift tube section of the at least two drift tube sections is disposed between a first resonant cavity and a second resonant cavity of the at least three resonant cavities along the propagation axis;
• a second drift tube section of the at least two drift tube sections is disposed between the second resonant cavity and a third resonant cavity of the at least three resonant cavities along the propagation axis, and the second drift tube section includes a wall material along at least one interior wall of the second drift tube section;
• wherein an electromagnetic property of the wall material is substantially different from the a permeability and a permittivity of vacuum and a wall material of a remainder of the hollow tube structure.