Control system for electron cyclotron resonance heating in the large helical device

The configuration of and methods for the Electron Cyclotron Resonance Heating (ECRH) control system in the Large Helical Device (LHD) are discussed. The ECRH system is routinely used for high electron temperature plasma production and sustainment in the LHD and must be remotely operated reliably and stably. The ECRH system consists of several elements that require reliable control and monitoring, including gyrotrons, high voltage power supplies, millimeter wave transmission systems, and antenna systems.