Peculiarities of working regimes of electron detector of two millimiter range with open resonance system with periodic structure

We discuss the characteristic features of operation regimes of an electron detector, operating in the two-millimeter range, with a virtual cathode, and an open resonant system with a period structure. We describe the construction, and give the dimensions, of the individual units. The device operation is based on the interaction of an electron beam with the forward and backward spatial harmonics; the device also operating in the diffraction regime. The current sensitivity of the detector varied across the range, and decreased significantly when going over from the diffraction regime to the travelling-wave and backward- wave regimes.