Amplification of extreme ultraviolet (XUV) radiation at wavelengths about 50 nm in a recombining z-pinch plasma is reported. Discharge currents of 40 kA were used to produce highly uniform plasma columns with a diameter of less than 500 mm and a length of up to 9 cm. During the expansion of the pinch plasma, amplification at the 4f-3d and 4d-3p transitions of lithiumlike oxygen OVI was observed. The gain-length products were determined to be 2.5 (4f-3d) and 2.2 (4d-3p), corresponding to gain coefficients of 0.28 and 0.24 cm 21 , respectively. [S0031-9007(96)
The fine-focusing capability of a current-carrying, "active" plasma lens has been demonstracted for the first time. A cylindrically symmetric argon discharge plasma pulsed with an oscillating current of over 20 kA in amplitude served as a current conducting medium. With this plasma lens has been demonstrated for the first time. A cylindrically symmetric argon discharge plasma pulsed with an oscillating current of over 20 kA in amplitude served as a current conducting medium. With this plasma lens the diameter of an incident 2.2-GeV gold ion beam from the linear accelerator UNILAC at GSI-Darmstadt was focused from initially 10 to about 0.25 mm, at a focal length of only 140 mm. The gradient of the azimuthal magnetic field exceeded 120 T/m. The striking features of this first-order and strong-focusing plasma lens favor its use as a precise high-gradient focusing device for high-energy charged particles.
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