Cooling system for the RIKEN Ring Cyclotron

A cooling system for the RIKEN Ring Cyclotron Facilities is described. The system was constructed to be capable of processing the estimated power consumption of 6 MW after completion of the facilities in the near future, though the present power consumption is about 2 MW. The system consists of three parts: one for the ring cyclotron and a part of beam transport line, one for various experimental apparatuses and the AVF Cyclotron, and one for an evacuation system. In the former two, deionized city water is used as a primary coolant and combination of a heat exchanger and a cooling tower is employed. In the latter undeionized city water is circulated in a cooling tower. The temperature of the coolant after cooling a device is planned not to exceed 50deg C. The design value of the coolant pressure is set below 10 kg/cm2. The operation of the system is performed manually on an operation panel in a local machine room, and the status of the system is displayed on a control console of the accelerator through a computer system. Several remarks on the maintenance of the system are also pointed out. (author)