Engineering and physics considerations for designing, installing and operating the plasma diagnostic set on DIII-D

A list and description of the resited and augmented set of plasma diagnostic instruments is given, including a list of systems and the parameters measured, the physical location around the DIII-D tokamak, the major space and engineering constraints, and the schedule for phased reinstallation on the tokamak. The order in which existing diagnostics are installed on DIII-D is dictated by their importance to the experimental program, their impact on the installation of other systems, and in some cases, the cost of modification. A more detailed description is given of the siting and design problems solved for several of the more complex diagnostic systems, such as the neutral particle charge exchange system, the Thomson scattering profile system, and the multichordal radial interferometer system. Some provision has been made to design and fabricate ports and the associated hardware to accommodate equipment built at other laboratories and universities that might be transported to DIII-D and installed with a minimum of further engineering modifications