Plasma-materials interactions

During the past year, fabrication of the top and bottom instrumented limiters for the Advanced Toroidal Facility (ATF) has progressed. A concept for divertor configuration studies has been laid out. Edge diagnostic development was concentrated on imaging techniques with charge-coupled device (CCD) and infrared (IR) cameras to study the plasma edge configuration of ATF. Arrays of H/sub α/ detectors have been designed and fabricated for studies of particle fluxes and global confinement time. Preparations have been made for wall conditioning of the ATF. International collaborations constitute a major part of the PMI Program. The conceptual design of the Tore Supra pump limiters has progressed. A magnetics code has been adapted to model the performance of a system of modular limiters. Toroidal field ripple effects have been studied to optimize the limiter shape for heat removal and particle exhaust. A diagnostic system for the pump limiter, with emphasis on optical diagnostics, has been laid out. An array of six H/sub α/ detectors has been fabricated for the ALT-II experiment on TEXTOR. Plasma transport and neutral transport codes have been set up to model particle transport with the ALT-II pump limiter in TEXTOR. In the area of plasma-surface interactions, hydrogen retention in graphite under plasma bombardment was studied