RELIABILITY INCREASE WAYS FOR HIGH-POWER LINACS - ADS DRIVERS

The reliability problem becomes special significant in a high-power linac, when it is used as the driver of electronuclear facility. In the report the reliability analysis of large linacs, their high power RF and other technological systems is given. Some possible means and engineering solutions suggested for reliability increase of planed super-power accelerators are considered. - ) linacs with output energy 20- 100 MeV works as injectors of large synchrotrons in a mode short (10-15 µs) and rare (1-10 Hz) pulses (I-2, ANL, CERN Linac-1, CERN Linac-2, KEK etc.). Bringing up to date insufficiently reliable linac parts and systems (19, 20), they succeeded in reduction of the total downtime of such machines up to 0.5-1.0 % of the planned operating time per year that can be considered as satisfactory result. At increase of output energy, duration and pulse- repetition rate, as in a case of FNAL linacs (before upgrade 200 MeV, d.f.=0.2 %) and BNL (200 MeV, d.f.=0.35 %), the shut-down times rises up to 2 and 7 % respectively, and at a fill d.f.=12 % on linac of a meson factory LAMPF with energy 800 MeV and beam power of 800 kW the downtime will increase till 15-20 % that are medial quantities for a 9-year's period of operation (21). It is possible to explain it by rising of power capacity of all technological systems, and also magnification of full amount of equipment. The distribution of downtime among technological systems of LAMPF linac have been described (21). It is important to note, that two systems - the injector and RF system together give about 60 % of downtimes.