Abstract
Inner-shell ionization and hollow atom x-ray lasers are studied in order to propose a short wavelength x-ray laser system. For hollow atom x-ray laser Mg vapor with 10<SUP>17</SUP> cm<SUP>-3</SUP> density and Larmor x-rays are treated as a target material and x-rays are treated as a target material and x-ray source, respectively. The Larmor x-rays are suitable as a pump x-ray source because they have high brightness and short pulse. Their peak intensity and energy spectrum are appropriate for inner-shell ionization. The necessary intensities of x-ray source are obtained by x-ray intensity of 10<SUP>13</SUP>W/cm<SUP>2</SUP> and 3 X 10<SUP>13</SUP> W/cm<SUP>2</SUP> in inner-shell ionization and hollow atom x-ray lasers, respectively. For short wavelength inner-shell ionization x- ray emission, Na-like ions are good target. By x-ray intensity of 2 X 10<SUP>15</SUP>W/cm<SUP>2</SUP> at a few keV photon energy, the gain is about 10 cm<SUP>-1</SUP> for more than 10 fs with use of Na-like S ion.
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