Abstract
A Passive Active Multijunction (PAM) launcher is designed for the ADITYA-U Tokamak. The launcher will launch 250 kW of RF power at 3.7 GHz into the tokamak. The tokamak will be operated at a toroidal magnetic field of 1.5 T and a plasma current of ∼200 kA. The performance of the launcher in terms of its temperature, thermal stress and deformations due to thermal loads and plasma current disruption is important. The paper presents the multiphysics simulation results of the proposed PAM launcher. The simulations are performed in COMSOL Multiphysics and the results are verified analytically. The maximum temperature of the launcher obtained was 38.5 °C, while the resultant thermal stress was ∼50 MPa for an input RF power of 250 kW. The peak temperature for input power of 150 kW and 350 kW was 31.5 °C and 47 °C respectively. The simulated Von-Mises stress on the launcher during plasma disruption was ∼2.21 MPa. These results are in good agreement with those obtained from analytical calculations.
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