We have built two experimental apparatuses CAPEX and CAPEX-U as XUV sources, which are based on the fast capillary discharge. On both these devices we have observed lasing at 46.9 nm (Ne-like Ar line). However, these devices are not only lasing at 46.9 nm, but they are used for testing a possibility of amplification at the wavelength below 20 nm that have more practical applications. Nowadays, the fast high-current capillary-discharge experiments with nitrogen-filled capillary are in progress as well. In this paper the pre-pulse capillary current and its influence on discharge parameters (the main current amplitude and duration, the plasma temperature and ionization stage) will be studied with the help of spectroscopic measurements.
展开▼
