Abstract
A 1-cm-long hollow parylene (C8H8) cylinder-type target was irradiated with a long pulse CO2 laser (400 J/50 ns) to produce a confined soft x-ray laser source. The amplification of the Balmer-alpha line (182.2 Å) of the H-like carbon was observed using two different gain determination methods. The time- and space-integrated gain coefficient up to 2.2(+0.6/−1.1)cm−1 was obtained from the ratio of the axial to transverse line intensity. By using the C8H7Cl target, the gain coefficient increased up to 2.8(+0.6/−1.1)cm−1, inferring the radiative cooling effect. The experimental results agreed with the simulation results within a factor of 5. By reducing the cylinder mass by a factor of 20, the simulation result gave the long gain duration up to 20 ns in FWHM and large gain region up to 1.3 mm in radius.
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