XUV AMPLIFICATION IN A RECOMBINING Z-PINCH PLASMA

Amplification of extreme ultraviolet (XUV) radiation at wavelengths ab out 50 nm in a recombining z-pinch plasma is reported. Discharge curre nts of 40 kA were used to produce highly uniform plasma columns with a diameter of less than 500 mu m and a length of up to 9 cm. During the expansion of the pinch plasma, amplification at the 4f-3d and 4d-3p t ransitions of lithiumlike oxygen OVI was observed. The gain-length pro ducts were determined to be 2.5 (4f-3d) and 2.2 (4d-3p), corresponding to gain coefficients of 0.28 and 0.24 cm(-1), respectively.