Joint JET ISX-B beryllium limiter experiment. Monthly newsletter, June 1984 (open access)

Joint JET ISX-B beryllium limiter experiment. Monthly newsletter, June 1984

The main goal for the month of June was the characterization of neutral beam heated discharges with the beryllium limiter. The beam injection experiments were begun with 0.53 MW of beam power yielding a total of 0.7 MW with the ohmic power included. At this power level the maximum limiter load was 1.4 kW/cm/sup 2/, and the surface temperature rise was about 300/sup 0/C. In the next step the injected power was raised to 0.83 MW so that the total heating power was about 1 MW. The plasma parameters were I/sub p/ = 116 kA, anti n/sub e/ = 4.10/sup 13/ cm/sup -3/, and B/sub T/ = 1.4 T. The resulting maximum heat flux on the limiters was 2.2 kW/cm/sup 2/, and the corresponding surface temperature rise was 470/sup 0/C. These conditions came very close to the design load of 2.5 kW/cm/sup 2/. At this point the plasma behavior was extensively characterized and documented in terms of density and temperature profiles, impurity content, parameter space, and limiter loads. It was found that the global plasma behavior was very similar to the reference case with the TiC-coated graphite limiters. In both cases the impurity content was dominated by oxygen and carbon, …
Date: January 1, 1984
Creator: unknown
System: The UNT Digital Library