Gas-filled-capillary discharge experiment
We have studied high-current capillary discharge as a prospective XUV laser source since 1998. We have built two experimental devices CAPEX and CAPEX-U. On both these devices we have observed the very strong amplification of neon-like argon line at 46.9 nm, which corresponds to laser transition. Recently high resolved spectra were obtained with the help of McPherson spectrometer as well as a spherical Si/Sc multilayer mirror was used to focus laser pulses generated by a 46.9-nm capillary-discharge amplifier. The latest experimental results are presented in this paper.
Soft X-ray emission of a fast-capillary-discharge device
The paper reports on some technological modifications of the capillary discharge device, especially in the spark gap region. Passively generated pre-pulse plasma was replaced by an external driver, which can independently control a pre-ionisation capillary current. The time development of the axial soft X-ray radiation of the modified capillary discharge device is reported as well.
Excitation and Radiation of Highly Ionised Ions in the Fast Gas‐Filled‐Capillary Discharge
The capillary experiment CAPEX was reconstructed to approach conditions suitable for creation of population inversion in Ne‐like Ar. The reconstruction consisted in substitution of ceramics capillary for former plastic one, in remarkable reduction of pre‐ionisation current, and in change of Ar filling and pumping geometry. The soft X‐ray spectroscopic measurements were performed with survey flat field spectrograph. It is shown that under certain conditions the strong spectral line at the wavelength of laser transition (46.9 nm) appears and dominates the spectrum even at exposition 50 ns.