The experimental study of the neutron-nuclei interaction based on the time-of-flight spectroscopy using the IBR-30 facility proceeds in the Frank Laboratory of Neutron Physics (JINR). This facility was built more than 20 years ago and needs the replacement. In accordance with the improvement program the new facility IREN (Intense REsonance Neutron source) is under construction now. The IREN setup  includes the driver electron linac LUE-200 and the multiplying target. Two high gradient (35 MeV/m) linac sections will be powered by the SLED power multiplication scheme based on the 5045 SLAC klystrons. Such a high value of electric field results in electron emission from the section walls (the so called dark current) and could increase the neutron pulse duration
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