A Network Based Telemetry Upgrade for the DIII-D Neutral Beam Power Diagnostics

Water flow calorimetry is utilized at DIII-D to quantify injected neutral beam power. As part of the system upgrades for the past year, the old CAMAC-based telemetry system for the WFC diagnostic was replaced by a fiber optic Ethernet-based telemetry system. The difficulty to obtain replacement CAMAC hardware and the prospect of lower noise and spurious signal sensitivity motivated the move to fiber optic Ethernet-based telemetry. The new system was installed and tested during the 2006 physics campaign startup phase. Both the CAMAC-based system and the new Ethernet-based system were used to acquire data from one common neutral beam ion source in the current year. System performance improvements are presented.