Characterization of megahertz X-ray laser beams by multishot desorption imprints in PMMA

0540378 - FZÚ 2021 RIV US eng J - Journal Article
Vozda, Vojtěch - Burian, Tomáš - Hájková, Věra - Juha, Libor - Enkisch, H. - Faatz, B. - Hermann, M. - Jacyna, I. - Jurek, M. - Keitel, B. - Klinger, D. - Loch, R. - Louis, E. - Makhotkin, I.A. - Ploenjes, E. - Saksl, K. - Siewert, F. - Sobierajski, R. - Strobel, S. - Tiedtke, K. - Toleikis, S. - de Vries, G. - Zelinger, Zdeněk - Chalupský, Jaromír
Characterization of megahertz X-ray laser beams by multishot desorption imprints in PMMA.
Optics Express. Roč. 28, č. 18 (2020), s. 25664-25681. ISSN 1094-4087
R&D Projects: GA ČR(CZ) GA17-05167s
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271 ; RVO:61388955
Keywords : multishot desorption imprints * free-electron laser (FEL) X-ray laser * poly(methyl methacrylate) (PMMA)
OECD category: Fluids and plasma physics (including surface physics); Physical chemistry (UFCH-W)
Impact factor: 3.894, year: 2020
Method of publishing: Open access

New challenges for beam diagnostic methods are introduced by modern free-electron laser (FEL) facilities capable of delivering powerful pulses at megahertz (MHz) repetition rates. In this paper, we report the first characterization of a defocused MHz 13.5-nm beam generated by the free-electron laser in Hamburg (FLASH) using the method of multi-pulse desorption imprints in poly(methyl methacrylate)(PMMA). The beam fluence profile is reconstructed in a novel and highly accurate way that takes into account the nonlinear response of material removal to total dose delivered by multiple pulses. The algorithm is applied to experimental data of single-shot ablation imprints and multi-shot desorption imprints at both low (10 Hz) and high (1 MHz) repetition rates. Reconstructed response functions show a great agreement with the theoretical desorption response function model.

Permanent Link: http://hdl.handle.net/11104/0318008