MAR-410 // ASTRAIOS Installation at HiSOR, Japan // ASTRAIOS analyzer installed and tested at Hiroshima Synchrotron Radiation Center

The ASTRAIOS 190 ARPES analyzer with ±30° full cone acceptance angle has been successfully installed and tested at the Hiroshima Synchrotron Radiation Center by Robert Reichelt and Sven Mähl from SPECS, and Masashi Arita from HiSor.

This state-of-the-art ARPES analyzer features a single shifting electrode assembly which can shift the momentum image such that the full momentum space mapping can be performed on the full acceptance cone of the accepted electrons.

The ASTRAIOS analyzer was installed at the helical/linear undulator beamline BL-9 (hν = 5-40 eV, typical resolution -E/EΔ = 20000-2000) to replace the old ARPES analyzer. The lens of the ASTRAIOS is optimized for extraction-field-free 2D momentum mapping and allows for wide acceptance angles of up to ±30° at a 27.5 mm working distance. One of the most innovative features of the ASTRAIOS 190 is the virtual entrance slit, which is located in an electron-optically equivalent plane in the lens instead of in the entrance plane of the analyzer.

The SPECS staff completed the installation and commissioning, and on the first day of use, the customer provided very positive feedback about the performance of the ASTRAIOS:

I am doing test measurements with your graphene. The brightness of the new analyzer is probably higher. In our BL, I have not obtained the ARPES band image and/or constant energy contour (Fermi surface) above 40 eV. Today, I can get the 6-Dirac point image of the graphene with SWAM in “hν = 90 eV” which has not been used due to low photon flux. It is possible to perform in-situ sample orientation alignment and the overall band measurement which has been difficult before. (M. Arita, HiSor)

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