Measurement of the absolute number of photons of the hard X-ray beamline at the Linac Coherent Light Source
Year: 2019
Type: article
Abstract: X-ray free-electron lasers provide intense pulses of coherent X-rays with a short pulse duration. These sources are chaotic by nature and therefore, to be used at their full potential, require that every X-ray pulse is characterized in terms of various relevant properties such as intensity, photon energy, position and timing. Diagnostics are for example installed on an X-ray beamline to specifically monitor the intensity of individual X-ray pulses. To date, these can however only provide a single-shot value of the relative number of photons per shot. Here are reported measurements made in January 2015 of the absolute number of photons in the hard X-ray regime at LCLS which is typically 3.5 × 1011 photons shot−1 between 6 and 9.5 keV at the X-ray Pump–Probe instrument. Moreover, an average transmission of ≈62% of the hard X-ray beamline over this energy range is measured and the third-harmonic content of ≈0.47% below 9 keV is characterized.
Source: Journal of Synchrotron Radiation
Authors: Sanghoon Song, Roberto Alonso-Mori, Matthieu Chollet, Yiping Feng, James M. Glownia, Henrik T. Lemke, Marcin Sikorski, Diling Zhu, Stefan Moeller, Hae Ja Lee, Mark S. Hunter, Gabriella Carini, Kai Tiedtke, Ulf Jastrow, Andrey Sorokin, Mathias Richter, Shigeki Owada, Kensuke Tono, Norio Saito, Takahiro Tanaka, Masahiro Kato, Makina Yabashi, Aymeric Robert
Institutions: SLAC National Accelerator Laboratory, Linac Coherent Light Source, Brookhaven National Laboratory, Deutsches Elektronen-Synchrotron DESY, Physikalisch-Technische Bundesanstalt, SPring-8, RIKEN, Japan Synchrotron Radiation Research Institute, National Institute of Advanced Industrial Science and Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,400
OpenAlex ID: W2912748446