Abstract
In order to increase X-ray output from the K shells of a highly ionized plasma in a small gas-puff Z-pinch, work with nitrogen or carbon instead of neon or argon is suggested. Basic measurements of the radiation of such a plasma, made by vacuum X-ray diodes and thin filters, are presented. Two working regimes with nitrogen at pinch currents 160 and 200 kA, with different contributions of line and continuous spectra in the K shell output, are discussed. It is shown that at a typical energy input of small Z-pinches (several kilo Joules) the suggested lighter elements can be ionized to He-like and H-like states not only in the hot spots, as has been observed with neon and argon, but also in the bulk. The yield of nitrogen K-shell radiation (about 10 J per shot) is therefore substantially higher than that of neon. Besides the pinch physics and radiation dynamics, the K-shell emission of the lighter elements may also be interesting in X-ray sources in the spectral region of a 'water window'.
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