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.
Comparing of calculated and experimental results of CAPEX-U device
The CAPEX-U (CAPillary EXperiment-Upgrade) apparatus has been developed as an XUV source based on high-current capillary discharge. Our main motivation for building such new device was to create the XUV source with amplification of spontaneous emission at shorter wavelengths (below 20 nm), which have more practical applications (the soft X-ray source for lithography and microscopy). The final experimental setup of the new device is described and the preliminary experimental results of the assembled apparatus are presented, especially the capillary current signal, and the time development of the pulse-forming-line voltage. The comparison of these experimental results with calculated/predicted values is reported in this paper as well.
Soft X-ray radiation of fast-capillary-discharge CAPEX 2
The paper reports on technological modifications of the capillary discharge experiment CAPEX, especially in capillary region. A temporal evolution of axial soft X-ray radiation and a spectroscopic measurement in the soft X-ray region on the modified capillary are presented as well. The strong spectral line at the wavelength of laser transition (Ne-like Ar, γ=46.9 nm) was observed.