LINEAR BEAM TUBES

摘要

An electron gun has at one end a cathode and at the other end, an anode. The anode is mounted adjacent to but isolated from an end wall of a structure downstream of the gun. The anode is supported by a folded mounting comprised of a first part extending back from the anode towards the cathode end of the gun and a second part extending forward from the end of the first part remote from the anode towards the end wall. One of the two parts is of an insulating material and has provided on a surface, a limiting impedance which is electrically in series in a path between the anode and an external termination which in operation may be grounded. This permits the naode to tend to charge towards cathode potential if an anode to cathode arc occurs.