12 December 2001 Modeling of short-pulse-driven nickel-like x-ray lasers and recent experiments
Author Affiliations +
The technique of using a nsec pulse to preform and ionize the plasma followed by a psec pulse to heat the plasma has enabled low-Z nickel-like ions to achieve saturated output when driven by small lasers with less than ten joules of energy. We model experiments done using the COMET laser at LLNL and the P102 laser at Limeil to produce Ni-like Pd and Ag lasers. The COMET experiments use a 2 J, 600 ps prepulse followed 700 psec later by a 6 J, 6 psec drive pulse in a 1.6-cm long line focus. The P102 experiments used a somewhat larger energy and were able to use different combinations of frequency doubled light for both the prepulse and short pulse drive. The LASNEX code is used to calculate the hydrodynamic evolution of the plasma and provide the temperatures and densities to the CRETIN code, which then does the kinetics calculations to determine the gain. The temporal and spatial evolution of the plasmas are studied both with and without radiation transport included to understand the role of the self photopumping process on the gain of the Ni-like 4f implies 4D laser lines as well as the gain of the usual collisionally driven Ni-like 4d implies 4p laser lines. In particular we study why the 4f implies 4d line lases well only when frequency doubled light is used with the prepulse in the P102 experiments. Experimental results are presented for Ni-like Pd including two- dimensional near-field and far-field images.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph Nilsen, Joseph Nilsen, James Dunn, James Dunn, "Modeling of short-pulse-driven nickel-like x-ray lasers and recent experiments", Proc. SPIE 4505, Soft X-Ray Lasers and Applications IV, (12 December 2001); doi: 10.1117/12.450579; https://doi.org/10.1117/12.450579


Recent x-ray laser experiments on the COMET facility
Proceedings of SPIE (December 11 2001)
Near field spatial imaging of the 11.9 nm Ni like...
Proceedings of SPIE (December 18 2003)
X-ray lasers at MBI
Proceedings of SPIE (October 05 2003)
Improved energy coupling into the gain region of the Ni...
Proceedings of SPIE (December 18 2003)
X ray laser research at Advanced Photon Research Center of...
Proceedings of SPIE (December 11 2001)
Modeling current and proposed COMET x-ray laser experiments
Proceedings of SPIE (December 18 2003)

Back to Top