Diagnostics for a magnetized target fusion experiment

We are planning experiments using a field reversed configuration plasma inj ected into a metal cylinder, which is subsequently electrically imploded to achieve a fusing plasma. Diagnosing this plasma is quite challenging due t o the short timescales, high energy densities, high magnetic fields, and di fficult access. We outline our diagnostic sets in both a phase I study (whe re the plasma will be formed and translated), and phase II study (where the plasma will be imploded). The precompression plasma (diameter of only 8-10 cm, length of 30-40 cm) is expected to have n similar to 10(17) cm(-3), T similar to 100-300 eV, B similar to 5 T, and a lifetime of 10-20 mus. We wi ll use visible laser interferometry across the plasma, along with a series of fiber-optically coupled visible light monitors to determine the plasma d ensity and position. Excluded flux loops will be placed outside the quartz tube of the formation region, but inside of the diameter of the theta -pinc h formation coils. Impurity emission in the visible and extreme ultraviolet range will be monitored spectroscopically, and fast bolometers will measur e the total radiated power. A 20 J Thomson scattering laser beam will be in troduced in the axial direction, and scattered light (from multiple spatial points) will be collected from the sides. Neutron diagnostics (activation and time-resolved scintillation detectors) will be fielded during both phas es of the DD experiments. (C) 2001 American Institute of Physics.