Results of experimental study of a wide-aperture relativistic klystron for VLEPP are presented. Investigations have been performed using the driving beam of the JINR LIA-3000 induction accelerator. To suppress self-excitation parasitic modes we have used technique of RF absorbing drift tubes. We have obtained 75 MW of output power in a long pulse (250 ns) and 100 MW ± in a short pulse (50 ns).
A concept of a linear proton accelerator with RF cavities excited by the electron beam is discussed. The accelerators with parameters of the second proton beam equal to 1 GeV, 10 -100 mA, can be used for a new type of electronuclear installations and neutron productions.
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