Commissioning of new injection line at INR proton linac

An essential reconstruction of the injection line has been carried out in the INR linac. The original LEBT was designed to inject 750 keV proton and H/sup -/ beams simultaneously into the Alvarez tank. It included a section downstream of the merging magnet, where two beams are transported simultaneously. In order to improve reliability of the high voltage transformers as well as to increase average current of the accelerated beam a decision has been taken to insert a booster RFQ downstream of the merging magnet. The 198.2 MHz RFQ has been designed to accelerate hydrogen ions from 400 keV to 750 keV. For the transportation of 400 keV beam from HV injector to the RFQ entrance the old part of the LEBT is used. A 345 mm space between RFQ and DTL contains a buncher with the effective voltage of 110 kV, four electromagnet quadrupole lenses and two boxes for beam diagnostics. The results of the commissioning of the new injection system are reported.