A high current, low emittance Li$^{+}$ alumino-silicate ion source and injector

We will present the design of a Li$^{+}$ ion source and injector for the Neutralized Drift Compression Experiment-II (NDCX-II) for warm dense matter experiments. The injector has been designed to use a large diameter ($\approx $ 11 cm) Li$^{+}$-doped alumino-silicate source with an injected ion kinetic energy of 100 keV, pulse duration of 0.5$\mu $s, and beam current of 100mA. Using small prototype emitters, at a temperature of approximately 1275\r{ } C, the space charge limited Li$^{+}$ beam current density of J $\approx $ 1 mA/cm$^{2}$ was obtained for a 0.64 cm diameter emitting area. The lifetime of the ion source is $\ge $ 50 hours while pulsing the extraction voltage at 2 to 3 times per minute (a rate expected in NDCX-II). We are designing and fabricating a larger diameter source, in parallel with continuing R {\&} D effort to increase the life time of the ion source.