Structure and intensity of x-ray radiation in a laser plasma-wall interaction

Alexander P. Shevelko; Larry V. Knight; Justin Peatross; Quan Wang

doi:10.1117/12.450588

12 December 2001 Structure and intensity of x-ray radiation in a laser plasma-wall interaction

Alexander P. Shevelko, Larry V. Knight, Justin Peatross, Quan Wang

Proceedings Volume 4505, Soft X-Ray Lasers and Applications IV; (2001) https://doi.org/10.1117/12.450588
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Intense soft x-ray radiation is observed when a high temperature laser produced plasma collides with a solid surface (wall). The laser plasma is produced by Nd:YAG laser radiation (0.53 micrometers ; 200 mJ; 3 ns; 5x10¹² w/cm² focused onto a Mg target. The wall is placed in the path of the plasma expansion. Two experimental techniques are used. 1) One-dimensional x-ray images of the plasma-wall gap formed by a slit are observed using an absolutely calibrated CCD linear array. 2) X-ray spectra of [H]- and [He]-like Mg ions are recorded using a crystal focusing x-ray von Hamos spectrometer. At a measured electron temperature of T_e equals 195 eV, emission of [He]-like ions Mg XI gives the main contribution to the observed x-ray intensity. The spatial structure and the intensity of the radiation are studied at various laser plasma-wall distances (r₀ equals 0.3 - 3.0 mm). Intense radiation near the wall is caused by an electron density jump in a shockwave formed in front of the wall. At small wall distances r₀<<v(tau) (v is the expansion velocity, tau is the laser pulse duration) the radiation is caused by excitation processes, and at distances r₀<0.3 mm the near wall intensity exceeds the emission from the laser plasma itself. At distances r₀$GTR$GTRv(tau) the radiation causes recombination processes. These results are important for developing collision and recombination schemes for x-ray lasers in colliding plasmas.

Citation Download Citation

Alexander P. Shevelko, Larry V. Knight, Justin Peatross, and Quan Wang "Structure and intensity of x-ray radiation in a laser plasma-wall interaction", Proc. SPIE 4505, Soft X-Ray Lasers and Applications IV, (12 December 2001); https://doi.org/10.1117/12.450588

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available