buncher

1. Something that bunches or causes to bunch.Examples: "Stranded copper wire and cable are made on machines known as bunchers or stranders. Conventional bunchers are used for stranding small diameter wires (34 to 10 AWG)."

2. Something that bunches or causes to bunch.Examples: "The pulse width can be decreased by means of a buncher, which consists of a longitudinal re-entrant cavity. The first electrons to reach the buncher are accelerated by a weaker longitudinal field than those that reach it at later times."; "Amplification has taken place because in the buncher grids the electrons are affected very little, but in the drift space this effect is given time to grow and the bunching becomes much more pronounced.[…]After leaving the buncher field the electrons travel towards the plate, are slowed down, stopped and then reattracted by the buncher."; "A two cavity Klystron amplifier consists of a cathode, focussing electrodes, two buncher grids separated by a very small distance forming a gap of two catcher grids with small gap B followed by a collector."

3. (military, RAF, World War II) A ground-based radio transmitter, configured within a system to guide aircraft to their allocated airfields.Examples: "Each airfield had its own buncher which emitted a particular radio signal. Each plane had a radio compass so that when we flew toward the buncher, the compass would go straight up. When we flew over the buncher, it would point straight down."