RADIOLYTIC CORROSION AND RELATES PROBLEMS IN THE COOLING WATER CIRCUITS OF HIGH-ENERGY PARTICLE ACCELERATORS

摘要

Copper(II) ion production by radiolytic effects in the RF-cooling water cir¬cuit of the CERN 600 MeV Synchro-cyclotron was determined. Corrosion inhibitors, such as hydrazine and benzotriazole, were added to the water in a "circuit-simulator" and the corrosion rate under irradiation conditions was studied. Later, these inhibitors were directly applied to the water of the RF-cooling circuit and their behaviour was examined.nBeam intensity, water flow rate, available copper surface and temperature were kept constant and the dependence of copper(II) ion production on irradiation time was determined. Through this experiment it was possible to derive a law C ~ t for the time (t) dependence of the increase of copper(II) ion concentration (c). It could be shown too, that corrosion of copper surfaces in an irradiated water circuit follows a law which is different from that for "normal" corrosion in pure demineralized (but oxygen-containing) water.