A plug-and-measure diagnostic tool for flux, resolution and beam size of a soft X-ray beamline.
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 mm(-1) and dispersing photons of energies from 80 to 1200 eV were calibrated with a photon flux of 10(11) photon s(-1) at slit openings of 50 µm × 50 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.
Department of Material Science and Engineering, National Chiao Tung University, Hsinchu 30013, Taiwan.
Ching Hsuan
CH
Wei
Department of Material Science and Engineering, National Chiao Tung University, Hsinchu 30013, Taiwan.
Hong Cheu
HC
Lin
National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
Shang Wei
SW
Lin
National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
Jih Young
JY
Yuh
dynamic beam size monitor; gas phase absorption; soft X-ray beamline; windowless ion chamber