Advanced wall reversed field pinch

For the next step in the investigation of reversed-field pinches, the HBTX machine is being converted to have an advanced first wall with a low Z smooth surface and a close-fitting, thick conducting shell. The new wall is the logical extrapolation of previous work where the loop voltage has been reduced about five fold by lowering field errors, improving the equilibrium, and removing the limiters. These steps reduce the magnetic flux intersecting the wall and the advanced first wall will further reduce this flux by suppressing magnetic fluctuations. The engineering design and construction of the new experiment are described. >