A plug-and-measure diagnostic tool for flux, resolution and beam size of a soft X-ray beamline

Ching Hsuan Wei, Hong-Cheu Lin*, Shang Wei Lin, Jih Young Yuh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A compact multi-functional diagnostic tool has been installed for commissioning beamlines at the Taiwan Light Source. For a photon beam, the instrument can measure the photon flux, energy resolution and beam size, consecutively with a photodiode or gold mesh, a windowless gas cell and a movable fluorescence screen viewport. Two gratings with ruling densities of 350 and 1000 lines-14;mm-1 and dispersing photons of energies from 80 to 1200-14;eV were calibrated with a photon flux of 1011-14;photon-14;s-1 at slit openings of 50-14;μm × 50-14;μm; a maximum resolving power of greater than 10000 was certified with an absorption spectra of gaseous samples. Pressure differences over four orders of magnitude were achieved between the ion chamber and the flux measurement chamber with a single capillary differential pumping stage. A sequence of beam profiles was measured by moving continuously in the vicinity of the nominal focal positions. This tool is useful in commissioning or trouble-shooting at most beamlines in a synchrotron facility.

Original languageEnglish
Pages (from-to)1289-1292
Number of pages4
JournalJournal of Synchrotron Radiation
StatePublished - 1 Sep 2015


  • Dynamic beam size monitor
  • Gas phase absorption
  • Soft X-ray beamline
  • Windowless ion chamber

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