Soft x-ray lasing in a capillary discharge
Journal Article
·
· AIP Conference Proceedings
- Department of Physics, Pohang University of Science and Technology, Pohang, 790-784 (Korea, Republic of)
Soft x-ray lasing in the C VI Balmer {alpha} transition is observed in a capillary discharge. The capillary is made of polyethylene with a bore diameter of 1.2 mm. Plasma radiation from the discharge is analyzed using a toroidal mirror and a two-meter grazing-incidence spectrograph-monochromator. The electron temperatures are measured at both the axial and the peripheral region close to the capillary wall, using space-resolved spectra. A comparison of the branching ratio in the hot (axial) and the cool (peripheral) plasma regions indicates that there is a large population inversion between n=3 and 2 states of C{sup 5+} ions in the cool (Te{approx}13 eV) region of the capillary plasma. Relative line intensities of the C VI H{alpha} and a number of non-lasing lines are compared in this cool region as a function of capillary length. The C VI H{alpha} line intensity increases exponentially whereas those of non-lasing transitions increase linearly with an increase of the capillary length. The gain coefficient thus measured indicates 2.8 cm{sup -1}. The lasing line intensity does not seem to increase exponentially beyond a capillary length of 16 mm and the gain-length product, gL, obtained here is 3.9, which is a typical value one would expect for a recombination soft x-ray laser. The photoelectric signals of the lasing line indicate that the lasing takes place about 40 ns after the current peak in the first half cycle of the capillary discharge, with a lasing pulse width of 60 ns in FWHM.
- OSTI ID:
- 21153870
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 332; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of the soft x-ray emission from carbon ions in a capillary discharge
False gain in x-ray laser experiments due to axial plasma expansion
Experiments of high gain C VI x-ray lasing in rapidly recombining plasmas
Journal Article
·
Thu Dec 31 23:00:00 EST 1992
· IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States)
·
OSTI ID:5767702
False gain in x-ray laser experiments due to axial plasma expansion
Journal Article
·
Sat Dec 31 23:00:00 EST 1994
· Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
·
OSTI ID:164984
Experiments of high gain C VI x-ray lasing in rapidly recombining plasmas
Journal Article
·
Mon May 01 00:00:00 EDT 1995
· AIP Conference Proceedings
·
OSTI ID:21153915