The characteristic of evaporative cooling magnet for ECRIS

Abstract

Compared with traditional de-ionized pressurized-water cooled magnet of ECRIS, evaporative cooling magnet has some special characteristics, such as high cooling efficiency, simple maintenance, and operation. The analysis is carried out according to the design and operation of LECR4 (Lanzhou Electron Cyclotron Resonance ion source No. 4, since July 2013), whose magnet is cooled by evaporative cooling technology. The insulation coolant replaces the de-ionized pressurized-water to absorb the heat of coils, and the physical and chemical properties of coolant remain stable for a long time with no need for purification or filtration. The coils of magnet are immersed in the liquid coolant. For the higher cooling efficiency of coolant, the current density of coils can be greatly improved. The heat transfer process executes under atmospheric pressure, and the temperature of coils is lower than 70 °C when the current density of coils is 12 A/mm(2). On the other hand, the heat transfer temperature of coolant is about 50 °C, and the heat can be transferred to fresh air which can save cost of water cooling system. Two years of LECR4 stable operation show that evaporative cooling technology can be used on magnet of ECRIS, and the application advantages are very obvious.

Thermal Circuit Analysis and Performance Evaluation of Evaporative Cooling Transformers Within Advanced Industrial Logistics Infrastructure

“…Air, their primary insulating and coolant coolant to absorb latent heat from heated components, enabling thermal system self-circulation [2]. Its merits of power insulation, excellent cooling performance, low system pressure, ease of maintenance, simple operation, nonflammability, safety, and reliability have facilitated its successful application in a range of electrical equipment, including hydroelectric generators (such as two 700MW units in the Three Gorges) [3], steam turbine generators [4], iron separators [5], frequency converters [6,7], ion source magnets [8], and supercomputers [9,10].…”