J. Phys. IV France
Volume 11, Numéro PR2, Juillet 2001
X-Ray Lasers 2000
Page(s) Pr2-103 - Pr2-106
7th International Conference on X-Ray Lasers

J. Phys. IV France 11 (2001) Pr2-103-Pr2-106

DOI: 10.1051/jp4:2001219

Investigation of X-ray lasing in a capillary discharge

S.S. Ellwi1, L. Juschkin1, S. Ferri1, H.-J. Kunze1 and E. Louis2

1  Institute for Experimental Physics V, Ruhr-University, 44780 Bochum, Germany
2  FOM - Institute for Plasma Physics Rijnhuizen, Nieuwegein, The Netherlands

Using a new technique of an induced MHD instability in a capillary made of polyacetal we observed an intense spike (signal) of the Balmer-[MATH] line of C VI at 18.22 nm during the second half cycle of the discharge. The spike is identified as Amplified Spontaneous Emission (ASE), and enhancements are derived for capillaries of lengths between 15 and 50 mm. This ASE is explained as a result of charge exchange between plasma ions produced in the neck of the MHD instability, where m=0, and low temperature ions which are present in the same plasma column. Different wavelengths of carbon and oxygen were scanned and no spike was seen with the exception of the one mentioned above. The amplitude of the spike was increased when a plane multilayer mirror of Mo/Si was introduced and a gain of 12 cm-1 was obtained.

© EDP Sciences 2001