Commissioning of the soft x-ray undulator beamline at the Siam Photon Laboratory
Journal Article
·
· AIP Conference Proceedings
- Synchrotron Light Research Institute, Muang, Nakhon Ratchasima 30000 (Thailand)
- School of Physics, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000 (Thailand)
The synchrotron radiation from the first undulator at the Siam Photon Laboratory was characterized with the photon beam position monitors (BPMs) and grating monochromator. The soft x-ray undulator beamline employs a varied line-spacing plane grating monochromator with three interchangeable gratings. Since 2010, the beamline has delivered photons with energy of 40-160 and 220-1040 eV at the resolving power of 10,000 for user services at the two end- stations that utilize the photoemission electron spectroscopy and microscopy techniques. The undulator power-density distributions measured by the 0.05-mm wire-scan BPM were in good agreement with those in simulation. The flux-density distributions were evaluated in the red-shift measurements, which identify the central cone of radiation and its distribution. Since 2014, the operation of the other insertion devices in the storage ring has started, and consequently bought about the increases in the emittance from 41 to 61 nm·rad and the coupling constant from 4 to 11%. The local electron-orbit correction greatly improved the alignment of the electron beam in the undulator section resulting in the improvements of the photon flux and harmonics peaks of the undulator radiation.
- OSTI ID:
- 22608333
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1741; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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