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Hohlraum Target for Overcoming Refractive Losses in Plasma X-ray Lasers

Date Do, 28.02.2013 - Do, 28.02.2013
Time 10.15
Speaker Leili Masoudnia, Institute of Applied Physics, University of Bern
Location Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern
Program Refractive losses along laser-produced plasmas used as gain media are caused by electron density gradients, and limit the transport range of energy. The pump pulse is thus deflected from the high gain region and also the short wavelength laser signal steers-away causing loss of collimation. A Hohlraum used as a target makes the plasma homogeneous and can mitigate refractive losses by means of wave-guiding. A computational study combining a hydro-code and an atomic- physics one is presented, which includes a ray tracing modeling of the trajectory-equation. This study presents gain calculations based on population inversion produced by free-electron collisions exciting bound electrons into metastable levels in the 3d94d1(J = 0) 3d94p1(J = 1) transition of Ni-like Sn. Further, the Hohlraum suggests a dramatic enhancement of the conversion efficiency of collisionally excited X-ray lasing for Ni-like Sn.
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