Single-shot third-harmonic spectral diagnostics for tender X-ray FEL pulses using a bent-crystal spectrometer
Christopher Arrell, Henrik Lemke, Eduard Prat · 2026
Read Single-shot third-harmonic spectral diagnostics for tender X-ray FEL pulses using a bent-crystal spectrometer by Christopher Arrell, Henrik Lemke, Eduard Prat (2026) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/pmc-13549333.txt.
Description
Free-electron lasers fire X-ray pulses too fast for slow diagnostics, and the tender X-ray band, vital for studying catalysts and energy materials, is the hardest to measure shot by shot. Arrell, Lemke, and Prat adapt a bent-crystal spectrometer at SwissFEL to read the pulse's natural third harmonic instead, a brighter stand-in at triple the energy. Scaling that spectrum back down reproduces the true pulse width.
Across 2,400 shots, the method capped its own blur below a tight limit and matched scans from a separate monochromator. The two-dimensional images even show the beam's cross shape, giving operators live feedback for tuning the laser. The authors offer the trick for routine tender X-ray running.
Catalog record
| CREATOR | Christopher Arrell, Henrik Lemke, Eduard Prat |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 33 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |