X-ray probe development for collective scattering measurements in dense plasmas

✍ Scribed by M.K. Urry; G. Gregori; O.L. Landen; A. Pak; S.H. Glenzer

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 306 KB
• Volume: 99
• Category: Article
• ISSN: 0022-4073
• DOI: 10.1016/j.jqsrt.2005.05.051

✦ Synopsis

X-ray spectra and conversion efficiencies of the laser-produced chlorine Ly-a and K-a line radiation have been investigated to develop X-ray probes for the collective scattering regime. The Ly-a radiation was produced by either smoothed or un-smoothed laser beams with nanosecond-long laser pulses yielding high conversion efficiencies of up to 0.3% sufficient for X-ray scattering measurements. However, the timeintegrated measurements show a significant dielectronic satellite emission on the red wing of the primary Ly-a line which must be avoided to resolve the plasmon feature in the scattering spectra. We find no red wing emission features for ultra-short pulse laser produced K-a radiation. The bandwidth of DE=E ¼ 2 Â 10 À3 is suited for collective scattering, but the conversion efficiency falls short of the high values achieved for the Ly-a. These findings indicate that present laser-produced X-ray sources will restrict the choice of detectors and plasma conditions for collective X-ray scattering from dense plasmas.