Abstract
Thermal co-simulation for the collector of a 140GHz, 1MW gyrotron is achieved in this paper. Thermal losses due to the particle collision in collector from the CST Particle Studio are directly applied to the thermal analysis by the CST Multi-Physics Studio. The convective heat transfer coefficient of copper with different water flow rate has been discussed. In the simulation, the maximum temperature in the collector changes from 419°C to 245°C, which is achieved respectively at the water flow rates from 5m/s to 15m/s. The thermal deformation caused by different temperature distribution in the collector changes from 0.551mm to 0.253mm, which provides physical analysis for the collector.
Highlights
The MW-class, continuous wave (CW), 140 GHz gyrotron has been already used in the future as the microwave source for heating, current drive and stability control of plasmas in the International Thermonuclear Experimental Reactor (ITER)
1000 kg/m3 0.664 W/m ∗ K 4200 J/kg ∗ K 4.47 × 10−7m2/s 1.01 × 10−3pa/s determined, the physical parameters of the water are shown in Table II: According to our water cooling system capacity, the convective heat transfer coefficient h with water flow rate from 5 m/s to 15 m/s is calculated by the previous formulas (1)–(8), and the length of collector is 750mm, the CST Multi-Physics Studio is applied to simulate the temperature distribution in the collector
The simulation results describe the thermal behavior in the collector, and the results of thermal solver are imported into mechanical solver to calculate the thermal deformation
Summary
The MW-class, continuous wave (CW), 140 GHz gyrotron has been already used in the future as the microwave source for heating, current drive and stability control of plasmas in the International Thermonuclear Experimental Reactor (ITER). The temperature caused by heat power dissipation of the collector will rise. In order to research the heat dissipation in the collector of gyrotron, some simulation methods are already used to describe the trajectory of electrons and the temperature distribution on the collector.. The previous thermal simulation always is performed only after obtaining the trajectory of electrons by other software, which could lead to the undesired errors in the result import processes. This paper is organized as follows: Section II presents the simulation approach and the analysis of convective heat transfer coefficient and temperature distribution in the collector.
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