To improve the spatial resolution of FIB systems, field type ion injector has been developed. Measurements of the injector parameters are performed on the high-vacuum stand with a residual pressure about <$E 5~cdot~10 sup -7> Pa. Ion injector consists of a needle-in-capillary type gas field ion source, focusing einzel lens and compact Wien filter with permanent magnets. The field ion source design provides the possibility of cooling the tungsten needle to a liquid nitrogen temperature. Current-voltage characteristics of the ion source operating at room temperature have been measured. Ion field emission current up to <$E (1~-~5)~cdot~10 sup -12> A at 2 - 5 kV emission voltage is obtained.

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