Progress of DIII-D High Field Side Lower Hybrid Current Drive Experiment

A high field side lower hybrid current drive (HFS LHCD) system is scheduled for operation in FY23. HFS LHCD is designed to drive off-axis current at r/a~0.6-0.8 with peak current density up to 0.4 MA/m$^2$ and 0.4 MA/MW coupled with n||~2.7 at 4.6 GHz. Due to improved wave accessibility and penetration from HFS, very high single pass absorption is expected. A novel, compact launcher distributes power poloidally utilizing a traveling wave, 4-way splitter and toroidally with a multi-junction that also determines the launched wave spectrum. The splitter utilizes imbedded RF elements to ensure proper power splitting and minimize reflection. The imbedded RF elements were enabled by additive manufacturing and the expected disruption loads and 400C bake compelled the use of a high strength copper alloy. The klystron system has been installed in the Lower Hybrid Vault and the control system has been integrated with the DIII-D plasma control. A HVPS has been relocated to DIII-D and tested. The waveguide runs between the klystrons and circulators have been installed allowing klystron testing into dummy load to verify operation. The latest simulations, design and system status will be presented.