Record Details

Absolute Pulse Energy Measurements of Soft X-Rays at the Linac Coherent Light Source
EuXFEL guest
Author group:
Instrument SPB/SFX
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 give a brief description of the detection principle for radiation measurements which was specifically adapted for this photon energy range. 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 on radiation contamination from spontaneous undulator radiation and higher harmonic content.
Washington, DC, Soc., 2014
Journal Information:
Opt. Express, 22, 18, 21214 (2014)
Related external records:
DOI: 10.1364/OE.22.021214
WOS: WOS:000341428000009


 Record created 2016-10-11, last modified 2019-02-08

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