Operation of Magnetic Diagnostics on the Lithium Tokamak eXperiment

The Lithium Tokamak eXperiment (LTX) is designed to investigate the novel, low-recycling lithium wall operating regime for magnetically confined plasmas. LTX reaches this regime through a heated shell coated with liquid lithium internal to the vacuum vessel. This shell provides an area of 5 m$^{2}$ of liquid lithium, more than 90{\%} coverage of plasma facing components. An extensive array of unique magnetic diagnostics has been developed to yield detailed magnetic information in the presence of the shell and allow highly-constrained reconstructions of the plasma equilibrium. CDX-U, with a 2000 cm$^{2}$ liquid lithium limiter, observed a 5-10 fold increase in energy confinement time from pre-Li discharges with Ohmic loop voltages of only 0.4-0.5 V. The expanded magnetic diagnostics set is designed to permit more accurate evaluation of the global energy confinement time and surface loop voltage for comparison with the results of CDX-U and to perform scaling experiments in order to elucidate the variation in~confinement with toroidal field, plasma current, and plasma density.