Absolute pulse energy measurements of soft x-rays at the Linac Coherent Light Source

0432645 - FZÚ 2015 RIV US eng J - Journal Article
Tiedtke, K. - Sorokin, A. A. - Jastrow, U. - Juranić, P. - Kreis, S. - Gerken, N. - Richter, M. - Arp, U. - Feng, Y. - Nordlund, D. - Soufli, R. - Fernández-Perea, M. - Juha, Libor - Heimann, P. - Nagler, B. - Lee, H.J. - Mack, S. - Cammarata, M. - Krupin, O. - Messerschmidt, M. - Holmes, M. - Rowen, M. - Schlotter, W. - Moeller, S. - Turner, J.J.
Absolute pulse energy measurements of soft x-rays at the Linac Coherent Light Source.
Optics Express. Roč. 22, č. 18 (2014), s. 21214-21226. ISSN 1094-4087
R&D Projects: GA MŠMT(CZ) LG13029
Institutional support: RVO:68378271
Keywords : soft x-ray * free electron laser * LCLS * instrumentation * measurement * metrology
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.488, year: 2014

This paper reports novel measurements of x-ray optical radiation on an absolute scale from the intense and ultra-short radiation generated in the soft x-ray regime of a free electron laser. We present data characterizing the soft x-ray instrument at the Linac Coherent Light Source (LCLS) with respect to the radiant power output and transmission by using an absolute detector temporarily placed at the downstream end of the instrument. This provides an estimation of the reflectivity of all x-ray optical elements in the beamline and provides the absolute photon number per bandwidth per pulse. This parameter is important for many experiments that need to understand the trade-offs between high energy resolution and high flux, such as experiments focused on studying materials via resonant processes. Furthermore, the results are compared with the LCLS diagnostic gas detectors to test the limits of linearity, and observations are reported.
Permanent Link: http://hdl.handle.net/11104/0237026