Abstract
A mutli-frequency electron cyclotron resonance heating and current drive system is currently under construction at the ST40 spherical tokamak. The system employs two gyrotrons with a maximum output power of 1 MW each. Both gyrotrons can be tuned to operate at either 105 GHz or 140 GHz. The system is designed to study a non-inductive plasma start-up, current ramp-up and sustainment. Detailed modelling of the system capabilities has been conducted for various RF launch configurations in ST40.
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