: The drift tubes between cavities are designed to cut off electromagnetic wave propagation, meaning cavities are coupled only by the bunched electron beam. Traveling Wave Tubes (TWTs) :
: Unlike klystrons, TWTs feature continuous interaction between an electron beam and a traveling wave along a slow-wave structure (like a helix). Principles of Klystrons, Traveling Wave Tubes, ...
Exceptional points of degeneracy in traveling wave tubes - OUCI : The drift tubes between cavities are designed
: The book spans 740 pages and details the operation and major classes of microwave tubes, including klystrons , traveling wave tubes (TWTs), magnetrons, cross-field amplifiers (CFAs), and gyrotrons. traveling wave tubes (TWTs)
Based on the principles outlined in the text and related resources: :