2 MW ECRH System for ST40 Spherical Tokamak

A multi-frequency electron cyclotron resonance heating (ECRH) and current drive (CD) system is currently under construction at the ST40 spherical tokamak. The system employs 2 GYCOM gyrotrons with a maximum output power of 1 MW each and a pulse length of 2s. Both gyrotrons can be tuned to operate either at 105 GHz or 140 GHz. The system is designed to study a non-inductive plasma start-up, current ramp-up and sustainment.