Engineering the Baseball Magnet System

The Baseball II magnet system has satisfactorily completed engineering testing at LRL. Over a three day period the magnet was lowered to 30°K by a helium refrigerator. Then the magnet was filled with liquid helium from the 10,000 liter storage dewar and energized to about 75% of its capability. The electrical and magnet quench systems performed satisfactorily. However, helium loss rates were greater than necessary because the permanent heat shield was not installed. A plasma beam line is being completed that incorporates superconducting magnetic shielding to protect the injected beam from the Baseball II fringe field.