Small-sized electron linear RF accelerator with beam autoacceleration for geology and industry

The paper deals with the project of a small-sized electron linear RF accelerator with a beam energy up to 1 MeV, intended for use in bore holes for geological purposes. The application of autoacceleration method allows to exclude a high-frequency generator and therefore essentially reduce the installation dimensions. A single electron beam generates RF power at the initial part of the accelerating structure, and at other-longer-part this RF power is used for acceleration of a small part of this beam. For RF-power generated at 3.5-4.5 GHz frequency band the accelerating structure diameter (for iris-loaded waveguide) can be about 70-90 mm or less. High voltage pulses (10-20 kV) are required for this accelerator operation. This pulses can be supplied with the help of cable, the length of which can be reasonably large. Such accelerator can be used for other purposes, as well, where the special requirements to a system dimensions occurs, and may be designed for exploitation in mobile (on a automobile) or portable variants