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The general scheme and current status of an electron linear accelerator with an S band travelling wave (f = 2856 MHz) accelerating structure-a driver for a pulsed neutron source (the Intense Resonance Neutron source (IREN)) at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research-are presented. The parameters of the accelerating system and the measured parameters of the electron beam-pulse beam current, duration of the current pulse, repetition rate, electron energy spec trum, and loading characteristics of the accelerating structure-are given. The beginning of the implemen tation of the project of the second stage of the IREN facility, which forms the basis for the development of the accelerator aimed at increasing its beam power, is reported. Technical solutions underlying the modernization of the accelerator's electrophysical systems are discussed: accelerating system, RF power supplies, and mod ulators.

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