Publications associated with Intense X-ray-Matter Interactions

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma.

Nature communications 6 (2015) 6397-

SM Vinko, O Ciricosta, TR Preston, DS Rackstraw, CRD Brown, T Burian, J Chalupský, BI Cho, H-K Chung, K Engelhorn, RW Falcone, R Fiokovinini, V Hájková, PA Heimann, L Juha, HJ Lee, RW Lee, M Messerschmidt, B Nagler, W Schlotter, JJ Turner, L Vysin, U Zastrau, JS Wark

The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures ~30 eV to be several times higher than that predicted by standard semiempirical models.

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