Development of water cooling distribution system for ITER-India Gyrotron Test Facility

ITER-India, the Indian domestic agency for ITER has the responsibility to supply 2 high power Gyrotron RF Sources (1 MW, 170 GHz, 3600 sec) for Electron Cyclotron Heating and Current Drive (EC H and CD) system on ITER. Currently, single Gyrotron operation scenario is considered in the IIGTF, which requires ∼2700 LPM of water at inlet pressure of 6 Bar through 22 cooling circuits to extract 2.5 MW of thermal load in the system. As the number of independent cooling circuits are more and their respective requirements are different, the components are grouped according to their pressure drop and flow rate specifications. Additionally, two booster pumps are considered in 2 groups to cater to the pressure drop requirements. Since most of the components of Gyrotron System are rated for low pressure, additional Pressure Reducing Valves (PRV) are considered in respective groups that can meet the required flow parameters of individual components. The design has also been verified with a flow analysis to ensure the flow balance at the rated specifications. Based on this design, development of water cooling system has been initiated through local industry and the fabrication is ongoing. During project execution, necessary design changes, aspects related to quality control have been implemented. This paper presents system overview, requirements, design concept, design changes, test plan and status in detail